blob: 1bcb63c7e39b8316ca8642dce640f543a5f6b012 [file] [log] [blame]
wdenkc6097192002-11-03 00:24:07 +00001#
Wolfgang Denkeca3aeb2013-06-21 10:22:36 +02002# (C) Copyright 2000 - 2013
wdenkc6097192002-11-03 00:24:07 +00003# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4#
Wolfgang Denkeca3aeb2013-06-21 10:22:36 +02005# SPDX-License-Identifier: GPL-2.0+
wdenkc6097192002-11-03 00:24:07 +00006#
7
8Summary:
9========
10
wdenk24ee89b2002-11-03 17:56:27 +000011This directory contains the source code for U-Boot, a boot loader for
wdenke86e5a02004-10-17 21:12:06 +000012Embedded boards based on PowerPC, ARM, MIPS and several other
13processors, which can be installed in a boot ROM and used to
14initialize and test the hardware or to download and run application
15code.
wdenkc6097192002-11-03 00:24:07 +000016
17The development of U-Boot is closely related to Linux: some parts of
wdenk24ee89b2002-11-03 17:56:27 +000018the source code originate in the Linux source tree, we have some
19header files in common, and special provision has been made to
wdenkc6097192002-11-03 00:24:07 +000020support booting of Linux images.
21
22Some attention has been paid to make this software easily
23configurable and extendable. For instance, all monitor commands are
24implemented with the same call interface, so that it's very easy to
25add new commands. Also, instead of permanently adding rarely used
26code (for instance hardware test utilities) to the monitor, you can
27load and run it dynamically.
28
29
30Status:
31=======
32
33In general, all boards for which a configuration option exists in the
wdenk24ee89b2002-11-03 17:56:27 +000034Makefile have been tested to some extent and can be considered
wdenkc6097192002-11-03 00:24:07 +000035"working". In fact, many of them are used in production systems.
36
wdenk24ee89b2002-11-03 17:56:27 +000037In case of problems see the CHANGELOG and CREDITS files to find out
Albert ARIBAUD27af9302013-09-11 15:52:51 +020038who contributed the specific port. The boards.cfg file lists board
Wolfgang Denk218ca722008-03-26 10:40:12 +010039maintainers.
wdenkc6097192002-11-03 00:24:07 +000040
Robert P. J. Dayadb9d852012-11-14 02:03:20 +000041Note: There is no CHANGELOG file in the actual U-Boot source tree;
42it can be created dynamically from the Git log using:
43
44 make CHANGELOG
45
wdenkc6097192002-11-03 00:24:07 +000046
47Where to get help:
48==================
49
wdenk24ee89b2002-11-03 17:56:27 +000050In case you have questions about, problems with or contributions for
51U-Boot you should send a message to the U-Boot mailing list at
Peter Tyser0c325652008-09-10 09:18:34 -050052<u-boot@lists.denx.de>. There is also an archive of previous traffic
53on the mailing list - please search the archive before asking FAQ's.
54Please see http://lists.denx.de/pipermail/u-boot and
55http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
wdenkc6097192002-11-03 00:24:07 +000056
57
Wolfgang Denk218ca722008-03-26 10:40:12 +010058Where to get source code:
59=========================
60
61The U-Boot source code is maintained in the git repository at
62git://www.denx.de/git/u-boot.git ; you can browse it online at
63http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
64
65The "snapshot" links on this page allow you to download tarballs of
Marcel Ziswiler11ccc332008-07-09 08:17:15 +020066any version you might be interested in. Official releases are also
Wolfgang Denk218ca722008-03-26 10:40:12 +010067available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
68directory.
69
Anatolij Gustschind4ee7112008-03-26 18:13:33 +010070Pre-built (and tested) images are available from
Wolfgang Denk218ca722008-03-26 10:40:12 +010071ftp://ftp.denx.de/pub/u-boot/images/
72
73
wdenkc6097192002-11-03 00:24:07 +000074Where we come from:
75===================
76
77- start from 8xxrom sources
wdenk24ee89b2002-11-03 17:56:27 +000078- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
wdenkc6097192002-11-03 00:24:07 +000079- clean up code
80- make it easier to add custom boards
81- make it possible to add other [PowerPC] CPUs
82- extend functions, especially:
83 * Provide extended interface to Linux boot loader
84 * S-Record download
85 * network boot
Marcel Ziswiler11ccc332008-07-09 08:17:15 +020086 * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
wdenk24ee89b2002-11-03 17:56:27 +000087- create ARMBoot project (http://sourceforge.net/projects/armboot)
wdenkc6097192002-11-03 00:24:07 +000088- add other CPU families (starting with ARM)
wdenk24ee89b2002-11-03 17:56:27 +000089- create U-Boot project (http://sourceforge.net/projects/u-boot)
Magnus Lilja0d28f342008-08-06 19:32:33 +020090- current project page: see http://www.denx.de/wiki/U-Boot
wdenk24ee89b2002-11-03 17:56:27 +000091
92
93Names and Spelling:
94===================
95
96The "official" name of this project is "Das U-Boot". The spelling
97"U-Boot" shall be used in all written text (documentation, comments
98in source files etc.). Example:
99
100 This is the README file for the U-Boot project.
101
102File names etc. shall be based on the string "u-boot". Examples:
103
104 include/asm-ppc/u-boot.h
105
106 #include <asm/u-boot.h>
107
108Variable names, preprocessor constants etc. shall be either based on
109the string "u_boot" or on "U_BOOT". Example:
110
111 U_BOOT_VERSION u_boot_logo
112 IH_OS_U_BOOT u_boot_hush_start
wdenkc6097192002-11-03 00:24:07 +0000113
114
wdenk93f19cc2002-12-17 17:55:09 +0000115Versioning:
116===========
117
Thomas Weber360d8832010-09-28 08:06:25 +0200118Starting with the release in October 2008, the names of the releases
119were changed from numerical release numbers without deeper meaning
120into a time stamp based numbering. Regular releases are identified by
121names consisting of the calendar year and month of the release date.
122Additional fields (if present) indicate release candidates or bug fix
123releases in "stable" maintenance trees.
wdenk93f19cc2002-12-17 17:55:09 +0000124
Thomas Weber360d8832010-09-28 08:06:25 +0200125Examples:
Wolfgang Denkc0f40852011-10-26 10:21:21 +0000126 U-Boot v2009.11 - Release November 2009
Thomas Weber360d8832010-09-28 08:06:25 +0200127 U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
128 U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
wdenk93f19cc2002-12-17 17:55:09 +0000129
130
wdenkc6097192002-11-03 00:24:07 +0000131Directory Hierarchy:
132====================
133
Peter Tyser8d321b82010-04-12 22:28:21 -0500134/arch Architecture specific files
Masahiro Yamada6eae68e2014-03-07 18:02:02 +0900135 /arc Files generic to ARC architecture
136 /cpu CPU specific files
137 /arc700 Files specific to ARC 700 CPUs
138 /lib Architecture specific library files
Peter Tyser8d321b82010-04-12 22:28:21 -0500139 /arm Files generic to ARM architecture
140 /cpu CPU specific files
141 /arm720t Files specific to ARM 720 CPUs
142 /arm920t Files specific to ARM 920 CPUs
Andreas Bießmann6eb09212011-07-18 09:41:08 +0000143 /at91 Files specific to Atmel AT91RM9200 CPU
Wolfgang Denka9046b92010-06-13 17:48:15 +0200144 /imx Files specific to Freescale MC9328 i.MX CPUs
145 /s3c24x0 Files specific to Samsung S3C24X0 CPUs
Peter Tyser8d321b82010-04-12 22:28:21 -0500146 /arm926ejs Files specific to ARM 926 CPUs
147 /arm1136 Files specific to ARM 1136 CPUs
Peter Tyser8d321b82010-04-12 22:28:21 -0500148 /pxa Files specific to Intel XScale PXA CPUs
Peter Tyser8d321b82010-04-12 22:28:21 -0500149 /sa1100 Files specific to Intel StrongARM SA1100 CPUs
150 /lib Architecture specific library files
151 /avr32 Files generic to AVR32 architecture
152 /cpu CPU specific files
153 /lib Architecture specific library files
154 /blackfin Files generic to Analog Devices Blackfin architecture
155 /cpu CPU specific files
156 /lib Architecture specific library files
Peter Tyser8d321b82010-04-12 22:28:21 -0500157 /m68k Files generic to m68k architecture
158 /cpu CPU specific files
159 /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
160 /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
161 /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
162 /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
163 /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
164 /lib Architecture specific library files
165 /microblaze Files generic to microblaze architecture
166 /cpu CPU specific files
167 /lib Architecture specific library files
168 /mips Files generic to MIPS architecture
169 /cpu CPU specific files
Daniel Schwierzeck92bbd642011-07-27 13:22:39 +0200170 /mips32 Files specific to MIPS32 CPUs
Masahiro Yamada6eae68e2014-03-07 18:02:02 +0900171 /mips64 Files specific to MIPS64 CPUs
Peter Tyser8d321b82010-04-12 22:28:21 -0500172 /lib Architecture specific library files
Macpaul Linafc1ce82011-10-19 20:41:11 +0000173 /nds32 Files generic to NDS32 architecture
174 /cpu CPU specific files
175 /n1213 Files specific to Andes Technology N1213 CPUs
176 /lib Architecture specific library files
Peter Tyser8d321b82010-04-12 22:28:21 -0500177 /nios2 Files generic to Altera NIOS2 architecture
178 /cpu CPU specific files
179 /lib Architecture specific library files
Robert P. J. Day33c77312013-09-15 18:34:15 -0400180 /openrisc Files generic to OpenRISC architecture
181 /cpu CPU specific files
182 /lib Architecture specific library files
Stefan Roesea47a12b2010-04-15 16:07:28 +0200183 /powerpc Files generic to PowerPC architecture
Peter Tyser8d321b82010-04-12 22:28:21 -0500184 /cpu CPU specific files
Peter Tyser8d321b82010-04-12 22:28:21 -0500185 /mpc5xx Files specific to Freescale MPC5xx CPUs
186 /mpc5xxx Files specific to Freescale MPC5xxx CPUs
187 /mpc8xx Files specific to Freescale MPC8xx CPUs
Peter Tyser8d321b82010-04-12 22:28:21 -0500188 /mpc8260 Files specific to Freescale MPC8260 CPUs
189 /mpc85xx Files specific to Freescale MPC85xx CPUs
190 /ppc4xx Files specific to AMCC PowerPC 4xx CPUs
191 /lib Architecture specific library files
192 /sh Files generic to SH architecture
193 /cpu CPU specific files
194 /sh2 Files specific to sh2 CPUs
195 /sh3 Files specific to sh3 CPUs
196 /sh4 Files specific to sh4 CPUs
197 /lib Architecture specific library files
198 /sparc Files generic to SPARC architecture
199 /cpu CPU specific files
200 /leon2 Files specific to Gaisler LEON2 SPARC CPU
201 /leon3 Files specific to Gaisler LEON3 SPARC CPU
202 /lib Architecture specific library files
Robert P. J. Day33c77312013-09-15 18:34:15 -0400203 /x86 Files generic to x86 architecture
204 /cpu CPU specific files
205 /lib Architecture specific library files
Peter Tyser8d321b82010-04-12 22:28:21 -0500206/api Machine/arch independent API for external apps
207/board Board dependent files
208/common Misc architecture independent functions
209/disk Code for disk drive partition handling
210/doc Documentation (don't expect too much)
211/drivers Commonly used device drivers
Robert P. J. Day33c77312013-09-15 18:34:15 -0400212/dts Contains Makefile for building internal U-Boot fdt.
Peter Tyser8d321b82010-04-12 22:28:21 -0500213/examples Example code for standalone applications, etc.
214/fs Filesystem code (cramfs, ext2, jffs2, etc.)
215/include Header Files
216/lib Files generic to all architectures
217 /libfdt Library files to support flattened device trees
218 /lzma Library files to support LZMA decompression
219 /lzo Library files to support LZO decompression
220/net Networking code
221/post Power On Self Test
Robert P. J. Day33c77312013-09-15 18:34:15 -0400222/spl Secondary Program Loader framework
Peter Tyser8d321b82010-04-12 22:28:21 -0500223/tools Tools to build S-Record or U-Boot images, etc.
wdenkc6097192002-11-03 00:24:07 +0000224
wdenkc6097192002-11-03 00:24:07 +0000225Software Configuration:
226=======================
227
228Configuration is usually done using C preprocessor defines; the
229rationale behind that is to avoid dead code whenever possible.
230
231There are two classes of configuration variables:
232
233* Configuration _OPTIONS_:
234 These are selectable by the user and have names beginning with
235 "CONFIG_".
236
237* Configuration _SETTINGS_:
238 These depend on the hardware etc. and should not be meddled with if
239 you don't know what you're doing; they have names beginning with
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200240 "CONFIG_SYS_".
wdenkc6097192002-11-03 00:24:07 +0000241
242Later we will add a configuration tool - probably similar to or even
243identical to what's used for the Linux kernel. Right now, we have to
244do the configuration by hand, which means creating some symbolic
245links and editing some configuration files. We use the TQM8xxL boards
246as an example here.
247
248
249Selection of Processor Architecture and Board Type:
250---------------------------------------------------
251
252For all supported boards there are ready-to-use default
Holger Freytherab584d62014-08-04 09:26:05 +0200253configurations available; just type "make <board_name>_defconfig".
wdenkc6097192002-11-03 00:24:07 +0000254
255Example: For a TQM823L module type:
256
257 cd u-boot
Holger Freytherab584d62014-08-04 09:26:05 +0200258 make TQM823L_defconfig
wdenkc6097192002-11-03 00:24:07 +0000259
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200260For the Cogent platform, you need to specify the CPU type as well;
Holger Freytherab584d62014-08-04 09:26:05 +0200261e.g. "make cogent_mpc8xx_defconfig". And also configure the cogent
wdenkc6097192002-11-03 00:24:07 +0000262directory according to the instructions in cogent/README.
263
264
Simon Glass75b3c3a2014-03-22 17:12:59 -0600265Sandbox Environment:
266--------------------
267
268U-Boot can be built natively to run on a Linux host using the 'sandbox'
269board. This allows feature development which is not board- or architecture-
270specific to be undertaken on a native platform. The sandbox is also used to
271run some of U-Boot's tests.
272
Jagannadha Sutradharudu Teki6b1978f2014-08-31 21:19:43 +0530273See board/sandbox/README.sandbox for more details.
Simon Glass75b3c3a2014-03-22 17:12:59 -0600274
275
Simon Glassdb910352015-03-03 08:03:00 -0700276Board Initialisation Flow:
277--------------------------
278
279This is the intended start-up flow for boards. This should apply for both
280SPL and U-Boot proper (i.e. they both follow the same rules). At present SPL
281mostly uses a separate code path, but the funtion names and roles of each
282function are the same. Some boards or architectures may not conform to this.
283At least most ARM boards which use CONFIG_SPL_FRAMEWORK conform to this.
284
285Execution starts with start.S with three functions called during init after
286that. The purpose and limitations of each is described below.
287
288lowlevel_init():
289 - purpose: essential init to permit execution to reach board_init_f()
290 - no global_data or BSS
291 - there is no stack (ARMv7 may have one but it will soon be removed)
292 - must not set up SDRAM or use console
293 - must only do the bare minimum to allow execution to continue to
294 board_init_f()
295 - this is almost never needed
296 - return normally from this function
297
298board_init_f():
299 - purpose: set up the machine ready for running board_init_r():
300 i.e. SDRAM and serial UART
301 - global_data is available
302 - stack is in SRAM
303 - BSS is not available, so you cannot use global/static variables,
304 only stack variables and global_data
305
306 Non-SPL-specific notes:
307 - dram_init() is called to set up DRAM. If already done in SPL this
308 can do nothing
309
310 SPL-specific notes:
311 - you can override the entire board_init_f() function with your own
312 version as needed.
313 - preloader_console_init() can be called here in extremis
314 - should set up SDRAM, and anything needed to make the UART work
315 - these is no need to clear BSS, it will be done by crt0.S
316 - must return normally from this function (don't call board_init_r()
317 directly)
318
319Here the BSS is cleared. For SPL, if CONFIG_SPL_STACK_R is defined, then at
320this point the stack and global_data are relocated to below
321CONFIG_SPL_STACK_R_ADDR. For non-SPL, U-Boot is relocated to run at the top of
322memory.
323
324board_init_r():
325 - purpose: main execution, common code
326 - global_data is available
327 - SDRAM is available
328 - BSS is available, all static/global variables can be used
329 - execution eventually continues to main_loop()
330
331 Non-SPL-specific notes:
332 - U-Boot is relocated to the top of memory and is now running from
333 there.
334
335 SPL-specific notes:
336 - stack is optionally in SDRAM, if CONFIG_SPL_STACK_R is defined and
337 CONFIG_SPL_STACK_R_ADDR points into SDRAM
338 - preloader_console_init() can be called here - typically this is
339 done by defining CONFIG_SPL_BOARD_INIT and then supplying a
340 spl_board_init() function containing this call
341 - loads U-Boot or (in falcon mode) Linux
342
343
344
wdenkc6097192002-11-03 00:24:07 +0000345Configuration Options:
346----------------------
347
348Configuration depends on the combination of board and CPU type; all
349such information is kept in a configuration file
350"include/configs/<board_name>.h".
351
352Example: For a TQM823L module, all configuration settings are in
353"include/configs/TQM823L.h".
354
355
wdenk7f6c2cb2002-11-10 22:06:23 +0000356Many of the options are named exactly as the corresponding Linux
357kernel configuration options. The intention is to make it easier to
358build a config tool - later.
359
360
wdenkc6097192002-11-03 00:24:07 +0000361The following options need to be configured:
362
Kim Phillips26281142007-08-10 13:28:25 -0500363- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
wdenkc6097192002-11-03 00:24:07 +0000364
Kim Phillips26281142007-08-10 13:28:25 -0500365- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
Wolfgang Denk6ccec442006-10-24 14:42:37 +0200366
367- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
Haavard Skinnemoen09ea0de2007-11-01 12:44:20 +0100368 Define exactly one, e.g. CONFIG_ATSTK1002
wdenkc6097192002-11-03 00:24:07 +0000369
370- CPU Module Type: (if CONFIG_COGENT is defined)
371 Define exactly one of
372 CONFIG_CMA286_60_OLD
373--- FIXME --- not tested yet:
374 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
375 CONFIG_CMA287_23, CONFIG_CMA287_50
376
377- Motherboard Type: (if CONFIG_COGENT is defined)
378 Define exactly one of
379 CONFIG_CMA101, CONFIG_CMA102
380
381- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
382 Define one or more of
383 CONFIG_CMA302
384
385- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
386 Define one or more of
387 CONFIG_LCD_HEARTBEAT - update a character position on
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200388 the LCD display every second with
wdenkc6097192002-11-03 00:24:07 +0000389 a "rotator" |\-/|\-/
390
Lei Wencf946c62011-02-09 18:06:58 +0530391- Marvell Family Member
392 CONFIG_SYS_MVFS - define it if you want to enable
393 multiple fs option at one time
394 for marvell soc family
395
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200396- 8xx CPU Options: (if using an MPC8xx CPU)
wdenk66ca92a2004-09-28 17:59:53 +0000397 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
398 get_gclk_freq() cannot work
wdenk5da627a2003-10-09 20:09:04 +0000399 e.g. if there is no 32KHz
400 reference PIT/RTC clock
wdenk66ca92a2004-09-28 17:59:53 +0000401 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
402 or XTAL/EXTAL)
wdenkc6097192002-11-03 00:24:07 +0000403
wdenk66ca92a2004-09-28 17:59:53 +0000404- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200405 CONFIG_SYS_8xx_CPUCLK_MIN
406 CONFIG_SYS_8xx_CPUCLK_MAX
wdenk66ca92a2004-09-28 17:59:53 +0000407 CONFIG_8xx_CPUCLK_DEFAULT
wdenk75d1ea72004-01-31 20:06:54 +0000408 See doc/README.MPC866
409
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200410 CONFIG_SYS_MEASURE_CPUCLK
wdenk75d1ea72004-01-31 20:06:54 +0000411
wdenkba56f622004-02-06 23:19:44 +0000412 Define this to measure the actual CPU clock instead
413 of relying on the correctness of the configured
414 values. Mostly useful for board bringup to make sure
415 the PLL is locked at the intended frequency. Note
416 that this requires a (stable) reference clock (32 kHz
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200417 RTC clock or CONFIG_SYS_8XX_XIN)
wdenk75d1ea72004-01-31 20:06:54 +0000418
Heiko Schocher506f3912009-03-12 07:37:15 +0100419 CONFIG_SYS_DELAYED_ICACHE
420
421 Define this option if you want to enable the
422 ICache only when Code runs from RAM.
423
Kumar Gala66412c62011-02-18 05:40:54 -0600424- 85xx CPU Options:
York Sunffd06e02012-10-08 07:44:30 +0000425 CONFIG_SYS_PPC64
426
427 Specifies that the core is a 64-bit PowerPC implementation (implements
428 the "64" category of the Power ISA). This is necessary for ePAPR
429 compliance, among other possible reasons.
430
Kumar Gala66412c62011-02-18 05:40:54 -0600431 CONFIG_SYS_FSL_TBCLK_DIV
432
433 Defines the core time base clock divider ratio compared to the
434 system clock. On most PQ3 devices this is 8, on newer QorIQ
435 devices it can be 16 or 32. The ratio varies from SoC to Soc.
436
Kumar Gala8f290842011-05-20 00:39:21 -0500437 CONFIG_SYS_FSL_PCIE_COMPAT
438
439 Defines the string to utilize when trying to match PCIe device
440 tree nodes for the given platform.
441
Prabhakar Kushwahaafa6b552012-04-29 23:56:13 +0000442 CONFIG_SYS_PPC_E500_DEBUG_TLB
443
444 Enables a temporary TLB entry to be used during boot to work
445 around limitations in e500v1 and e500v2 external debugger
446 support. This reduces the portions of the boot code where
447 breakpoints and single stepping do not work. The value of this
448 symbol should be set to the TLB1 entry to be used for this
449 purpose.
450
Scott Wood33eee332012-08-14 10:14:53 +0000451 CONFIG_SYS_FSL_ERRATUM_A004510
452
453 Enables a workaround for erratum A004510. If set,
454 then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
455 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
456
457 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
458 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
459
460 Defines one or two SoC revisions (low 8 bits of SVR)
461 for which the A004510 workaround should be applied.
462
463 The rest of SVR is either not relevant to the decision
464 of whether the erratum is present (e.g. p2040 versus
465 p2041) or is implied by the build target, which controls
466 whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
467
468 See Freescale App Note 4493 for more information about
469 this erratum.
470
Prabhakar Kushwaha74fa22e2013-04-16 13:27:44 +0530471 CONFIG_A003399_NOR_WORKAROUND
472 Enables a workaround for IFC erratum A003399. It is only
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -0800473 required during NOR boot.
Prabhakar Kushwaha74fa22e2013-04-16 13:27:44 +0530474
Prabhakar Kushwaha9f074e62014-10-29 22:33:09 +0530475 CONFIG_A008044_WORKAROUND
476 Enables a workaround for T1040/T1042 erratum A008044. It is only
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -0800477 required during NAND boot and valid for Rev 1.0 SoC revision
Prabhakar Kushwaha9f074e62014-10-29 22:33:09 +0530478
Scott Wood33eee332012-08-14 10:14:53 +0000479 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
480
481 This is the value to write into CCSR offset 0x18600
482 according to the A004510 workaround.
483
Priyanka Jain64501c62013-07-02 09:21:04 +0530484 CONFIG_SYS_FSL_DSP_DDR_ADDR
485 This value denotes start offset of DDR memory which is
486 connected exclusively to the DSP cores.
487
Priyanka Jain765b0bd2013-04-04 09:31:54 +0530488 CONFIG_SYS_FSL_DSP_M2_RAM_ADDR
489 This value denotes start offset of M2 memory
490 which is directly connected to the DSP core.
491
Priyanka Jain64501c62013-07-02 09:21:04 +0530492 CONFIG_SYS_FSL_DSP_M3_RAM_ADDR
493 This value denotes start offset of M3 memory which is directly
494 connected to the DSP core.
495
Priyanka Jain765b0bd2013-04-04 09:31:54 +0530496 CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
497 This value denotes start offset of DSP CCSR space.
498
Priyanka Jainb1359912013-12-17 14:25:52 +0530499 CONFIG_SYS_FSL_SINGLE_SOURCE_CLK
500 Single Source Clock is clocking mode present in some of FSL SoC's.
501 In this mode, a single differential clock is used to supply
502 clocks to the sysclock, ddrclock and usbclock.
503
Aneesh Bansalfb4a2402014-03-18 23:40:26 +0530504 CONFIG_SYS_CPC_REINIT_F
505 This CONFIG is defined when the CPC is configured as SRAM at the
506 time of U-boot entry and is required to be re-initialized.
507
Tang Yuantianaade2002014-04-17 15:33:46 +0800508 CONFIG_DEEP_SLEEP
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -0800509 Indicates this SoC supports deep sleep feature. If deep sleep is
Tang Yuantianaade2002014-04-17 15:33:46 +0800510 supported, core will start to execute uboot when wakes up.
511
Daniel Schwierzeck6cb461b2012-04-02 02:57:56 +0000512- Generic CPU options:
York Sun2a1680e2014-05-02 17:28:04 -0700513 CONFIG_SYS_GENERIC_GLOBAL_DATA
514 Defines global data is initialized in generic board board_init_f().
515 If this macro is defined, global data is created and cleared in
516 generic board board_init_f(). Without this macro, architecture/board
517 should initialize global data before calling board_init_f().
518
Daniel Schwierzeck6cb461b2012-04-02 02:57:56 +0000519 CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
520
521 Defines the endianess of the CPU. Implementation of those
522 values is arch specific.
523
York Sun5614e712013-09-30 09:22:09 -0700524 CONFIG_SYS_FSL_DDR
525 Freescale DDR driver in use. This type of DDR controller is
526 found in mpc83xx, mpc85xx, mpc86xx as well as some ARM core
527 SoCs.
528
529 CONFIG_SYS_FSL_DDR_ADDR
530 Freescale DDR memory-mapped register base.
531
532 CONFIG_SYS_FSL_DDR_EMU
533 Specify emulator support for DDR. Some DDR features such as
534 deskew training are not available.
535
536 CONFIG_SYS_FSL_DDRC_GEN1
537 Freescale DDR1 controller.
538
539 CONFIG_SYS_FSL_DDRC_GEN2
540 Freescale DDR2 controller.
541
542 CONFIG_SYS_FSL_DDRC_GEN3
543 Freescale DDR3 controller.
544
York Sun34e026f2014-03-27 17:54:47 -0700545 CONFIG_SYS_FSL_DDRC_GEN4
546 Freescale DDR4 controller.
547
York Sun9ac4ffb2013-09-30 14:20:51 -0700548 CONFIG_SYS_FSL_DDRC_ARM_GEN3
549 Freescale DDR3 controller for ARM-based SoCs.
550
York Sun5614e712013-09-30 09:22:09 -0700551 CONFIG_SYS_FSL_DDR1
552 Board config to use DDR1. It can be enabled for SoCs with
553 Freescale DDR1 or DDR2 controllers, depending on the board
554 implemetation.
555
556 CONFIG_SYS_FSL_DDR2
557 Board config to use DDR2. It can be eanbeld for SoCs with
558 Freescale DDR2 or DDR3 controllers, depending on the board
559 implementation.
560
561 CONFIG_SYS_FSL_DDR3
562 Board config to use DDR3. It can be enabled for SoCs with
York Sun34e026f2014-03-27 17:54:47 -0700563 Freescale DDR3 or DDR3L controllers.
564
565 CONFIG_SYS_FSL_DDR3L
566 Board config to use DDR3L. It can be enabled for SoCs with
567 DDR3L controllers.
568
569 CONFIG_SYS_FSL_DDR4
570 Board config to use DDR4. It can be enabled for SoCs with
571 DDR4 controllers.
York Sun5614e712013-09-30 09:22:09 -0700572
Prabhakar Kushwaha1b4175d2014-01-18 12:28:30 +0530573 CONFIG_SYS_FSL_IFC_BE
574 Defines the IFC controller register space as Big Endian
575
576 CONFIG_SYS_FSL_IFC_LE
577 Defines the IFC controller register space as Little Endian
578
Prabhakar Kushwaha690e4252014-01-13 11:28:04 +0530579 CONFIG_SYS_FSL_PBL_PBI
580 It enables addition of RCW (Power on reset configuration) in built image.
581 Please refer doc/README.pblimage for more details
582
583 CONFIG_SYS_FSL_PBL_RCW
584 It adds PBI(pre-boot instructions) commands in u-boot build image.
585 PBI commands can be used to configure SoC before it starts the execution.
586 Please refer doc/README.pblimage for more details
587
Prabhakar Kushwaha89ad7be2014-04-08 19:13:34 +0530588 CONFIG_SPL_FSL_PBL
589 It adds a target to create boot binary having SPL binary in PBI format
590 concatenated with u-boot binary.
591
York Sun4e5b1bd2014-02-10 13:59:42 -0800592 CONFIG_SYS_FSL_DDR_BE
593 Defines the DDR controller register space as Big Endian
594
595 CONFIG_SYS_FSL_DDR_LE
596 Defines the DDR controller register space as Little Endian
597
York Sun6b9e3092014-02-10 13:59:43 -0800598 CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY
599 Physical address from the view of DDR controllers. It is the
600 same as CONFIG_SYS_DDR_SDRAM_BASE for all Power SoCs. But
601 it could be different for ARM SoCs.
602
York Sun6b1e1252014-02-10 13:59:44 -0800603 CONFIG_SYS_FSL_DDR_INTLV_256B
604 DDR controller interleaving on 256-byte. This is a special
605 interleaving mode, handled by Dickens for Freescale layerscape
606 SoCs with ARM core.
607
York Sun1d71efb2014-08-01 15:51:00 -0700608 CONFIG_SYS_FSL_DDR_MAIN_NUM_CTRLS
609 Number of controllers used as main memory.
610
611 CONFIG_SYS_FSL_OTHER_DDR_NUM_CTRLS
612 Number of controllers used for other than main memory.
613
Ruchika Gupta028dbb82014-09-09 11:50:31 +0530614 CONFIG_SYS_FSL_SEC_BE
615 Defines the SEC controller register space as Big Endian
616
617 CONFIG_SYS_FSL_SEC_LE
618 Defines the SEC controller register space as Little Endian
619
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100620- Intel Monahans options:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200621 CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100622
623 Defines the Monahans run mode to oscillator
624 ratio. Valid values are 8, 16, 24, 31. The core
625 frequency is this value multiplied by 13 MHz.
626
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200627 CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200628
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100629 Defines the Monahans turbo mode to oscillator
630 ratio. Valid values are 1 (default if undefined) and
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200631 2. The core frequency as calculated above is multiplied
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100632 by this value.
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200633
Daniel Schwierzeck92bbd642011-07-27 13:22:39 +0200634- MIPS CPU options:
635 CONFIG_SYS_INIT_SP_OFFSET
636
637 Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
638 pointer. This is needed for the temporary stack before
639 relocation.
640
641 CONFIG_SYS_MIPS_CACHE_MODE
642
643 Cache operation mode for the MIPS CPU.
644 See also arch/mips/include/asm/mipsregs.h.
645 Possible values are:
646 CONF_CM_CACHABLE_NO_WA
647 CONF_CM_CACHABLE_WA
648 CONF_CM_UNCACHED
649 CONF_CM_CACHABLE_NONCOHERENT
650 CONF_CM_CACHABLE_CE
651 CONF_CM_CACHABLE_COW
652 CONF_CM_CACHABLE_CUW
653 CONF_CM_CACHABLE_ACCELERATED
654
655 CONFIG_SYS_XWAY_EBU_BOOTCFG
656
657 Special option for Lantiq XWAY SoCs for booting from NOR flash.
658 See also arch/mips/cpu/mips32/start.S.
659
660 CONFIG_XWAY_SWAP_BYTES
661
662 Enable compilation of tools/xway-swap-bytes needed for Lantiq
663 XWAY SoCs for booting from NOR flash. The U-Boot image needs to
664 be swapped if a flash programmer is used.
665
Christian Rieschb67d8812012-02-02 00:44:39 +0000666- ARM options:
667 CONFIG_SYS_EXCEPTION_VECTORS_HIGH
668
669 Select high exception vectors of the ARM core, e.g., do not
670 clear the V bit of the c1 register of CP15.
671
Aneesh V5356f542012-03-08 07:20:19 +0000672 CONFIG_SYS_THUMB_BUILD
673
674 Use this flag to build U-Boot using the Thumb instruction
675 set for ARM architectures. Thumb instruction set provides
676 better code density. For ARM architectures that support
677 Thumb2 this flag will result in Thumb2 code generated by
678 GCC.
679
Stephen Warrenc5d47522013-03-04 13:29:40 +0000680 CONFIG_ARM_ERRATA_716044
Stephen Warren06785872013-02-26 12:28:27 +0000681 CONFIG_ARM_ERRATA_742230
682 CONFIG_ARM_ERRATA_743622
683 CONFIG_ARM_ERRATA_751472
Nitin Gargf71cbfe2014-04-02 08:55:01 -0500684 CONFIG_ARM_ERRATA_794072
Nitin Gargb7588e32014-04-02 08:55:02 -0500685 CONFIG_ARM_ERRATA_761320
Stephen Warren06785872013-02-26 12:28:27 +0000686
687 If set, the workarounds for these ARM errata are applied early
688 during U-Boot startup. Note that these options force the
689 workarounds to be applied; no CPU-type/version detection
690 exists, unlike the similar options in the Linux kernel. Do not
691 set these options unless they apply!
692
York Sun207774b2015-03-20 19:28:08 -0700693 COUNTER_FREQUENCY
694 Generic timer clock source frequency.
695
696 COUNTER_FREQUENCY_REAL
697 Generic timer clock source frequency if the real clock is
698 different from COUNTER_FREQUENCY, and can only be determined
699 at run time.
700
Nishanth Menonc616a0d2015-03-09 17:11:59 -0500701 NOTE: The following can be machine specific errata. These
702 do have ability to provide rudimentary version and machine
703 specific checks, but expect no product checks.
Nishanth Menon5902f4c2015-03-09 17:12:01 -0500704 CONFIG_ARM_ERRATA_430973
Nishanth Menonb45c48a2015-03-09 17:12:00 -0500705 CONFIG_ARM_ERRATA_454179
Nishanth Menon9b4d65f2015-03-09 17:12:02 -0500706 CONFIG_ARM_ERRATA_621766
Nishanth Menonc616a0d2015-03-09 17:11:59 -0500707 CONFIG_ARM_ERRATA_798870
708
Stephen Warren73c38932015-01-19 16:25:52 -0700709- Tegra SoC options:
710 CONFIG_TEGRA_SUPPORT_NON_SECURE
711
712 Support executing U-Boot in non-secure (NS) mode. Certain
713 impossible actions will be skipped if the CPU is in NS mode,
714 such as ARM architectural timer initialization.
715
wdenk5da627a2003-10-09 20:09:04 +0000716- Linux Kernel Interface:
wdenkc6097192002-11-03 00:24:07 +0000717 CONFIG_CLOCKS_IN_MHZ
718
719 U-Boot stores all clock information in Hz
720 internally. For binary compatibility with older Linux
721 kernels (which expect the clocks passed in the
722 bd_info data to be in MHz) the environment variable
723 "clocks_in_mhz" can be defined so that U-Boot
724 converts clock data to MHZ before passing it to the
725 Linux kernel.
wdenkc6097192002-11-03 00:24:07 +0000726 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
Wolfgang Denk218ca722008-03-26 10:40:12 +0100727 "clocks_in_mhz=1" is automatically included in the
wdenkc6097192002-11-03 00:24:07 +0000728 default environment.
729
wdenk5da627a2003-10-09 20:09:04 +0000730 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
731
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -0800732 When transferring memsize parameter to Linux, some versions
wdenk5da627a2003-10-09 20:09:04 +0000733 expect it to be in bytes, others in MB.
734 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
735
Gerald Van Barenfec6d9e2008-06-03 20:34:45 -0400736 CONFIG_OF_LIBFDT
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200737
738 New kernel versions are expecting firmware settings to be
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400739 passed using flattened device trees (based on open firmware
740 concepts).
741
742 CONFIG_OF_LIBFDT
743 * New libfdt-based support
744 * Adds the "fdt" command
Kim Phillips3bb342f2007-08-10 14:34:14 -0500745 * The bootm command automatically updates the fdt
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400746
Marcel Ziswilerb55ae402009-09-09 21:18:41 +0200747 OF_CPU - The proper name of the cpus node (only required for
748 MPC512X and MPC5xxx based boards).
749 OF_SOC - The proper name of the soc node (only required for
750 MPC512X and MPC5xxx based boards).
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200751 OF_TBCLK - The timebase frequency.
Kumar Galac2871f02006-01-11 13:59:02 -0600752 OF_STDOUT_PATH - The path to the console device
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200753
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200754 boards with QUICC Engines require OF_QE to set UCC MAC
755 addresses
Kim Phillips3bb342f2007-08-10 14:34:14 -0500756
Kumar Gala4e253132006-01-11 13:54:17 -0600757 CONFIG_OF_BOARD_SETUP
758
759 Board code has addition modification that it wants to make
760 to the flat device tree before handing it off to the kernel
wdenk6705d812004-08-02 23:22:59 +0000761
Simon Glassc654b512014-10-23 18:58:54 -0600762 CONFIG_OF_SYSTEM_SETUP
763
764 Other code has addition modification that it wants to make
765 to the flat device tree before handing it off to the kernel.
766 This causes ft_system_setup() to be called before booting
767 the kernel.
768
Matthew McClintock02677682006-06-28 10:41:37 -0500769 CONFIG_OF_BOOT_CPU
770
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200771 This define fills in the correct boot CPU in the boot
Matthew McClintock02677682006-06-28 10:41:37 -0500772 param header, the default value is zero if undefined.
773
Heiko Schocher3887c3f2009-09-23 07:56:08 +0200774 CONFIG_OF_IDE_FIXUP
775
776 U-Boot can detect if an IDE device is present or not.
777 If not, and this new config option is activated, U-Boot
778 removes the ATA node from the DTS before booting Linux,
779 so the Linux IDE driver does not probe the device and
780 crash. This is needed for buggy hardware (uc101) where
781 no pull down resistor is connected to the signal IDE5V_DD7.
782
Igor Grinberg7eb29392011-07-14 05:45:07 +0000783 CONFIG_MACH_TYPE [relevant for ARM only][mandatory]
784
785 This setting is mandatory for all boards that have only one
786 machine type and must be used to specify the machine type
787 number as it appears in the ARM machine registry
788 (see http://www.arm.linux.org.uk/developer/machines/).
789 Only boards that have multiple machine types supported
790 in a single configuration file and the machine type is
791 runtime discoverable, do not have to use this setting.
792
Niklaus Giger0b2f4ec2008-11-03 22:13:47 +0100793- vxWorks boot parameters:
794
795 bootvx constructs a valid bootline using the following
796 environments variables: bootfile, ipaddr, serverip, hostname.
797 It loads the vxWorks image pointed bootfile.
798
799 CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
800 CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
801 CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
802 CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
803
804 CONFIG_SYS_VXWORKS_ADD_PARAMS
805
806 Add it at the end of the bootline. E.g "u=username pw=secret"
807
808 Note: If a "bootargs" environment is defined, it will overwride
809 the defaults discussed just above.
810
Aneesh V2c451f72011-06-16 23:30:47 +0000811- Cache Configuration:
812 CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
813 CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
814 CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
815
Aneesh V93bc2192011-06-16 23:30:51 +0000816- Cache Configuration for ARM:
817 CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
818 controller
819 CONFIG_SYS_PL310_BASE - Physical base address of PL310
820 controller register space
821
wdenk6705d812004-08-02 23:22:59 +0000822- Serial Ports:
Andreas Engel48d01922008-09-08 14:30:53 +0200823 CONFIG_PL010_SERIAL
wdenk6705d812004-08-02 23:22:59 +0000824
825 Define this if you want support for Amba PrimeCell PL010 UARTs.
826
Andreas Engel48d01922008-09-08 14:30:53 +0200827 CONFIG_PL011_SERIAL
wdenk6705d812004-08-02 23:22:59 +0000828
829 Define this if you want support for Amba PrimeCell PL011 UARTs.
830
831 CONFIG_PL011_CLOCK
832
833 If you have Amba PrimeCell PL011 UARTs, set this variable to
834 the clock speed of the UARTs.
835
836 CONFIG_PL01x_PORTS
837
838 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
839 define this to a list of base addresses for each (supported)
840 port. See e.g. include/configs/versatile.h
841
John Rigby910f1ae2011-04-19 10:42:39 +0000842 CONFIG_PL011_SERIAL_RLCR
843
844 Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
845 have separate receive and transmit line control registers. Set
846 this variable to initialize the extra register.
847
848 CONFIG_PL011_SERIAL_FLUSH_ON_INIT
849
850 On some platforms (e.g. U8500) U-Boot is loaded by a second stage
851 boot loader that has already initialized the UART. Define this
852 variable to flush the UART at init time.
853
Karicheri, Muralidharand57dee52014-04-09 15:38:46 -0400854 CONFIG_SERIAL_HW_FLOW_CONTROL
855
856 Define this variable to enable hw flow control in serial driver.
857 Current user of this option is drivers/serial/nsl16550.c driver
wdenk6705d812004-08-02 23:22:59 +0000858
wdenkc6097192002-11-03 00:24:07 +0000859- Console Interface:
wdenk43d96162003-03-06 00:02:04 +0000860 Depending on board, define exactly one serial port
861 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
862 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
863 console by defining CONFIG_8xx_CONS_NONE
wdenkc6097192002-11-03 00:24:07 +0000864
865 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
866 port routines must be defined elsewhere
867 (i.e. serial_init(), serial_getc(), ...)
868
869 CONFIG_CFB_CONSOLE
870 Enables console device for a color framebuffer. Needs following
Wolfgang Denkc53043b2011-12-07 12:19:20 +0000871 defines (cf. smiLynxEM, i8042)
wdenkc6097192002-11-03 00:24:07 +0000872 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
873 (default big endian)
874 VIDEO_HW_RECTFILL graphic chip supports
875 rectangle fill
876 (cf. smiLynxEM)
877 VIDEO_HW_BITBLT graphic chip supports
878 bit-blit (cf. smiLynxEM)
879 VIDEO_VISIBLE_COLS visible pixel columns
880 (cols=pitch)
wdenkba56f622004-02-06 23:19:44 +0000881 VIDEO_VISIBLE_ROWS visible pixel rows
882 VIDEO_PIXEL_SIZE bytes per pixel
wdenkc6097192002-11-03 00:24:07 +0000883 VIDEO_DATA_FORMAT graphic data format
884 (0-5, cf. cfb_console.c)
wdenkba56f622004-02-06 23:19:44 +0000885 VIDEO_FB_ADRS framebuffer address
wdenkc6097192002-11-03 00:24:07 +0000886 VIDEO_KBD_INIT_FCT keyboard int fct
887 (i.e. i8042_kbd_init())
888 VIDEO_TSTC_FCT test char fct
889 (i.e. i8042_tstc)
890 VIDEO_GETC_FCT get char fct
891 (i.e. i8042_getc)
892 CONFIG_CONSOLE_CURSOR cursor drawing on/off
893 (requires blink timer
894 cf. i8042.c)
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200895 CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
wdenkc6097192002-11-03 00:24:07 +0000896 CONFIG_CONSOLE_TIME display time/date info in
897 upper right corner
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500898 (requires CONFIG_CMD_DATE)
wdenkc6097192002-11-03 00:24:07 +0000899 CONFIG_VIDEO_LOGO display Linux logo in
900 upper left corner
wdenka6c7ad22002-12-03 21:28:10 +0000901 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
902 linux_logo.h for logo.
903 Requires CONFIG_VIDEO_LOGO
wdenkc6097192002-11-03 00:24:07 +0000904 CONFIG_CONSOLE_EXTRA_INFO
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200905 additional board info beside
wdenkc6097192002-11-03 00:24:07 +0000906 the logo
907
Pali Rohár33a35bb2012-10-19 13:30:09 +0000908 When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
909 a limited number of ANSI escape sequences (cursor control,
910 erase functions and limited graphics rendition control).
911
wdenk43d96162003-03-06 00:02:04 +0000912 When CONFIG_CFB_CONSOLE is defined, video console is
913 default i/o. Serial console can be forced with
914 environment 'console=serial'.
wdenkc6097192002-11-03 00:24:07 +0000915
wdenkd4ca31c2004-01-02 14:00:00 +0000916 When CONFIG_SILENT_CONSOLE is defined, all console
917 messages (by U-Boot and Linux!) can be silenced with
918 the "silent" environment variable. See
919 doc/README.silent for more information.
wdenka3ad8e22003-10-19 23:22:11 +0000920
Heiko Schocher45ae2542013-10-22 11:06:06 +0200921 CONFIG_SYS_CONSOLE_BG_COL: define the backgroundcolor, default
922 is 0x00.
923 CONFIG_SYS_CONSOLE_FG_COL: define the foregroundcolor, default
924 is 0xa0.
925
wdenkc6097192002-11-03 00:24:07 +0000926- Console Baudrate:
927 CONFIG_BAUDRATE - in bps
928 Select one of the baudrates listed in
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200929 CONFIG_SYS_BAUDRATE_TABLE, see below.
930 CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
wdenkc6097192002-11-03 00:24:07 +0000931
Heiko Schocherc92fac92009-01-30 12:55:38 +0100932- Console Rx buffer length
933 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
934 the maximum receive buffer length for the SMC.
Heiko Schocher2b3f12c2009-02-10 09:31:47 +0100935 This option is actual only for 82xx and 8xx possible.
Heiko Schocherc92fac92009-01-30 12:55:38 +0100936 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
937 must be defined, to setup the maximum idle timeout for
938 the SMC.
939
Graeme Russ9558b482011-09-01 00:48:27 +0000940- Pre-Console Buffer:
Wolfgang Denk4cf26092011-10-07 09:58:21 +0200941 Prior to the console being initialised (i.e. serial UART
942 initialised etc) all console output is silently discarded.
943 Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
944 buffer any console messages prior to the console being
945 initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
946 bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
947 a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
Wolfgang Denk6feff892011-10-09 21:06:34 +0200948 bytes are output before the console is initialised, the
Wolfgang Denk4cf26092011-10-07 09:58:21 +0200949 earlier bytes are discarded.
Graeme Russ9558b482011-09-01 00:48:27 +0000950
Hans de Goedea8552c72015-05-05 13:13:36 +0200951 Note that when printing the buffer a copy is made on the
952 stack so CONFIG_PRE_CON_BUF_SZ must fit on the stack.
953
Wolfgang Denk4cf26092011-10-07 09:58:21 +0200954 'Sane' compilers will generate smaller code if
955 CONFIG_PRE_CON_BUF_SZ is a power of 2
Graeme Russ9558b482011-09-01 00:48:27 +0000956
Sonny Rao046a37b2011-11-02 09:52:08 +0000957- Safe printf() functions
958 Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
959 the printf() functions. These are defined in
960 include/vsprintf.h and include snprintf(), vsnprintf() and
961 so on. Code size increase is approximately 300-500 bytes.
962 If this option is not given then these functions will
963 silently discard their buffer size argument - this means
964 you are not getting any overflow checking in this case.
965
wdenkc6097192002-11-03 00:24:07 +0000966- Boot Delay: CONFIG_BOOTDELAY - in seconds
967 Delay before automatically booting the default image;
968 set to -1 to disable autoboot.
Joe Hershberger93d72122012-08-17 10:53:12 +0000969 set to -2 to autoboot with no delay and not check for abort
970 (even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
wdenkc6097192002-11-03 00:24:07 +0000971
972 See doc/README.autoboot for these options that
973 work with CONFIG_BOOTDELAY. None are required.
974 CONFIG_BOOT_RETRY_TIME
975 CONFIG_BOOT_RETRY_MIN
976 CONFIG_AUTOBOOT_KEYED
977 CONFIG_AUTOBOOT_PROMPT
978 CONFIG_AUTOBOOT_DELAY_STR
979 CONFIG_AUTOBOOT_STOP_STR
wdenkc6097192002-11-03 00:24:07 +0000980 CONFIG_ZERO_BOOTDELAY_CHECK
981 CONFIG_RESET_TO_RETRY
982
983- Autoboot Command:
984 CONFIG_BOOTCOMMAND
985 Only needed when CONFIG_BOOTDELAY is enabled;
986 define a command string that is automatically executed
987 when no character is read on the console interface
988 within "Boot Delay" after reset.
989
990 CONFIG_BOOTARGS
wdenk43d96162003-03-06 00:02:04 +0000991 This can be used to pass arguments to the bootm
992 command. The value of CONFIG_BOOTARGS goes into the
993 environment value "bootargs".
wdenkc6097192002-11-03 00:24:07 +0000994
995 CONFIG_RAMBOOT and CONFIG_NFSBOOT
wdenk43d96162003-03-06 00:02:04 +0000996 The value of these goes into the environment as
997 "ramboot" and "nfsboot" respectively, and can be used
998 as a convenience, when switching between booting from
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200999 RAM and NFS.
wdenkc6097192002-11-03 00:24:07 +00001000
Heiko Schochereda0ba32013-11-04 14:04:59 +01001001- Bootcount:
1002 CONFIG_BOOTCOUNT_LIMIT
1003 Implements a mechanism for detecting a repeating reboot
1004 cycle, see:
1005 http://www.denx.de/wiki/view/DULG/UBootBootCountLimit
1006
1007 CONFIG_BOOTCOUNT_ENV
1008 If no softreset save registers are found on the hardware
1009 "bootcount" is stored in the environment. To prevent a
1010 saveenv on all reboots, the environment variable
1011 "upgrade_available" is used. If "upgrade_available" is
1012 0, "bootcount" is always 0, if "upgrade_available" is
1013 1 "bootcount" is incremented in the environment.
1014 So the Userspace Applikation must set the "upgrade_available"
1015 and "bootcount" variable to 0, if a boot was successfully.
1016
wdenkc6097192002-11-03 00:24:07 +00001017- Pre-Boot Commands:
1018 CONFIG_PREBOOT
1019
1020 When this option is #defined, the existence of the
1021 environment variable "preboot" will be checked
1022 immediately before starting the CONFIG_BOOTDELAY
1023 countdown and/or running the auto-boot command resp.
1024 entering interactive mode.
1025
1026 This feature is especially useful when "preboot" is
1027 automatically generated or modified. For an example
1028 see the LWMON board specific code: here "preboot" is
1029 modified when the user holds down a certain
1030 combination of keys on the (special) keyboard when
1031 booting the systems
1032
1033- Serial Download Echo Mode:
1034 CONFIG_LOADS_ECHO
1035 If defined to 1, all characters received during a
1036 serial download (using the "loads" command) are
1037 echoed back. This might be needed by some terminal
1038 emulations (like "cu"), but may as well just take
1039 time on others. This setting #define's the initial
1040 value of the "loads_echo" environment variable.
1041
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001042- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
wdenkc6097192002-11-03 00:24:07 +00001043 CONFIG_KGDB_BAUDRATE
1044 Select one of the baudrates listed in
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001045 CONFIG_SYS_BAUDRATE_TABLE, see below.
wdenkc6097192002-11-03 00:24:07 +00001046
1047- Monitor Functions:
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001048 Monitor commands can be included or excluded
1049 from the build by using the #include files
Stephen Warrenc6c621b2012-08-05 16:07:19 +00001050 <config_cmd_all.h> and #undef'ing unwanted
Joe Hershbergeref0f2f52015-06-22 16:15:30 -05001051 commands, or adding #define's for wanted commands.
wdenkc6097192002-11-03 00:24:07 +00001052
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001053 The default command configuration includes all commands
1054 except those marked below with a "*".
wdenkc6097192002-11-03 00:24:07 +00001055
Marek Vasutb401b732014-03-05 19:58:39 +01001056 CONFIG_CMD_AES AES 128 CBC encrypt/decrypt
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001057 CONFIG_CMD_ASKENV * ask for env variable
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001058 CONFIG_CMD_BDI bdinfo
1059 CONFIG_CMD_BEDBUG * Include BedBug Debugger
1060 CONFIG_CMD_BMP * BMP support
1061 CONFIG_CMD_BSP * Board specific commands
1062 CONFIG_CMD_BOOTD bootd
Tom Rinid2b2ffe2014-08-14 06:42:36 -04001063 CONFIG_CMD_BOOTI * ARM64 Linux kernel Image support
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001064 CONFIG_CMD_CACHE * icache, dcache
Michal Simek08d0d6f2013-11-21 13:39:02 -08001065 CONFIG_CMD_CLK * clock command support
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001066 CONFIG_CMD_CONSOLE coninfo
Mike Frysinger710b9932010-12-21 14:19:51 -05001067 CONFIG_CMD_CRC32 * crc32
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001068 CONFIG_CMD_DATE * support for RTC, date/time...
1069 CONFIG_CMD_DHCP * DHCP support
1070 CONFIG_CMD_DIAG * Diagnostics
Peter Tysera7c93102008-12-17 16:36:22 -06001071 CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
1072 CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
1073 CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
1074 CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001075 CONFIG_CMD_DTT * Digital Therm and Thermostat
1076 CONFIG_CMD_ECHO echo arguments
Peter Tyser246c6922009-10-25 15:12:56 -05001077 CONFIG_CMD_EDITENV edit env variable
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001078 CONFIG_CMD_EEPROM * EEPROM read/write support
1079 CONFIG_CMD_ELF * bootelf, bootvx
Joe Hershberger5e2b3e02012-12-11 22:16:25 -06001080 CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
Joe Hershbergerfffad712012-12-11 22:16:33 -06001081 CONFIG_CMD_ENV_FLAGS * display details about env flags
Andrew Ruder88733e22013-10-22 19:07:34 -05001082 CONFIG_CMD_ENV_EXISTS * check existence of env variable
Mike Frysinger0c79cda2010-12-26 23:09:45 -05001083 CONFIG_CMD_EXPORTENV * export the environment
Stephen Warren03e2ecf2012-10-22 06:43:50 +00001084 CONFIG_CMD_EXT2 * ext2 command support
1085 CONFIG_CMD_EXT4 * ext4 command support
Stephen Warren16f4d932014-01-24 20:46:37 -07001086 CONFIG_CMD_FS_GENERIC * filesystem commands (e.g. load, ls)
1087 that work for multiple fs types
Christian Gmeiner59e890e2014-11-12 14:35:04 +01001088 CONFIG_CMD_FS_UUID * Look up a filesystem UUID
Mike Frysingerbdab39d2009-01-28 19:08:14 -05001089 CONFIG_CMD_SAVEENV saveenv
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001090 CONFIG_CMD_FDC * Floppy Disk Support
Stephen Warren03e2ecf2012-10-22 06:43:50 +00001091 CONFIG_CMD_FAT * FAT command support
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001092 CONFIG_CMD_FLASH flinfo, erase, protect
1093 CONFIG_CMD_FPGA FPGA device initialization support
Vincent Stehlé4d98b5c2013-06-20 18:14:22 +02001094 CONFIG_CMD_FUSE * Device fuse support
Anton Staaf53fdc7e2012-12-05 14:46:29 +00001095 CONFIG_CMD_GETTIME * Get time since boot
Mike Frysingera641b972010-12-26 23:32:22 -05001096 CONFIG_CMD_GO * the 'go' command (exec code)
Kim Phillipsa000b792011-04-05 07:15:14 +00001097 CONFIG_CMD_GREPENV * search environment
Simon Glassbf36c5d2012-12-05 14:46:38 +00001098 CONFIG_CMD_HASH * calculate hash / digest
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001099 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
1100 CONFIG_CMD_I2C * I2C serial bus support
1101 CONFIG_CMD_IDE * IDE harddisk support
1102 CONFIG_CMD_IMI iminfo
Vipin Kumar8fdf1e02012-12-16 22:32:48 +00001103 CONFIG_CMD_IMLS List all images found in NOR flash
Vincent Stehlé4d98b5c2013-06-20 18:14:22 +02001104 CONFIG_CMD_IMLS_NAND * List all images found in NAND flash
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001105 CONFIG_CMD_IMMAP * IMMR dump support
Simon Glassaa532332014-06-11 23:29:41 -06001106 CONFIG_CMD_IOTRACE * I/O tracing for debugging
Mike Frysinger0c79cda2010-12-26 23:09:45 -05001107 CONFIG_CMD_IMPORTENV * import an environment
Joe Hershbergerc167cc02012-10-03 11:15:51 +00001108 CONFIG_CMD_INI * import data from an ini file into the env
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001109 CONFIG_CMD_IRQ * irqinfo
1110 CONFIG_CMD_ITEST Integer/string test of 2 values
1111 CONFIG_CMD_JFFS2 * JFFS2 Support
1112 CONFIG_CMD_KGDB * kgdb
Vincent Stehlé4d98b5c2013-06-20 18:14:22 +02001113 CONFIG_CMD_LDRINFO * ldrinfo (display Blackfin loader)
Joe Hershbergerd22c3382012-05-23 08:00:12 +00001114 CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration
1115 (169.254.*.*)
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001116 CONFIG_CMD_LOADB loadb
1117 CONFIG_CMD_LOADS loads
Vincent Stehlé4d98b5c2013-06-20 18:14:22 +02001118 CONFIG_CMD_MD5SUM * print md5 message digest
Robin Getz02c9aa12009-07-27 00:07:59 -04001119 (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
Simon Glass15a33e42012-11-30 13:01:20 +00001120 CONFIG_CMD_MEMINFO * Display detailed memory information
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001121 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
Wolfgang Denka2681702013-03-08 10:51:32 +00001122 loop, loopw
Vincent Stehlé4d98b5c2013-06-20 18:14:22 +02001123 CONFIG_CMD_MEMTEST * mtest
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001124 CONFIG_CMD_MISC Misc functions like sleep etc
1125 CONFIG_CMD_MMC * MMC memory mapped support
1126 CONFIG_CMD_MII * MII utility commands
Stefan Roese68d7d652009-03-19 13:30:36 +01001127 CONFIG_CMD_MTDPARTS * MTD partition support
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001128 CONFIG_CMD_NAND * NAND support
1129 CONFIG_CMD_NET bootp, tftpboot, rarpboot
Vincent Stehlé4d98b5c2013-06-20 18:14:22 +02001130 CONFIG_CMD_NFS NFS support
Peter Tysere92739d2008-12-17 16:36:21 -06001131 CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
Wolfgang Denkc0f40852011-10-26 10:21:21 +00001132 CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001133 CONFIG_CMD_PCI * pciinfo
1134 CONFIG_CMD_PCMCIA * PCMCIA support
1135 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
1136 host
1137 CONFIG_CMD_PORTIO * Port I/O
Kenneth Watersff048ea2012-12-05 14:46:30 +00001138 CONFIG_CMD_READ * Read raw data from partition
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001139 CONFIG_CMD_REGINFO * Register dump
1140 CONFIG_CMD_RUN run command in env variable
Simon Glassd3049312012-12-26 09:53:36 +00001141 CONFIG_CMD_SANDBOX * sb command to access sandbox features
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001142 CONFIG_CMD_SAVES * save S record dump
1143 CONFIG_CMD_SCSI * SCSI Support
1144 CONFIG_CMD_SDRAM * print SDRAM configuration information
1145 (requires CONFIG_CMD_I2C)
1146 CONFIG_CMD_SETGETDCR Support for DCR Register access
1147 (4xx only)
Eric Nelsonf61ec452012-01-31 10:52:08 -07001148 CONFIG_CMD_SF * Read/write/erase SPI NOR flash
Vincent Stehlé4d98b5c2013-06-20 18:14:22 +02001149 CONFIG_CMD_SHA1SUM * print sha1 memory digest
Robin Getz02c9aa12009-07-27 00:07:59 -04001150 (requires CONFIG_CMD_MEMORY)
Bob Liu7d861d92013-02-05 19:05:41 +08001151 CONFIG_CMD_SOFTSWITCH * Soft switch setting command for BF60x
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02001152 CONFIG_CMD_SOURCE "source" command Support
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001153 CONFIG_CMD_SPI * SPI serial bus support
Luca Ceresoli7a83af02011-05-17 00:03:40 +00001154 CONFIG_CMD_TFTPSRV * TFTP transfer in server mode
Simon Glass1fb7cd42011-10-24 18:00:07 +00001155 CONFIG_CMD_TFTPPUT * TFTP put command (upload)
Joe Hershbergerda83bcd2012-10-03 12:14:57 +00001156 CONFIG_CMD_TIME * run command and report execution time (ARM specific)
1157 CONFIG_CMD_TIMER * access to the system tick timer
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001158 CONFIG_CMD_USB * USB support
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001159 CONFIG_CMD_CDP * Cisco Discover Protocol support
Marek Vasutc8339f52012-03-31 07:47:16 +00001160 CONFIG_CMD_MFSL * Microblaze FSL support
Vincent Stehlé4d98b5c2013-06-20 18:14:22 +02001161 CONFIG_CMD_XIMG Load part of Multi Image
Przemyslaw Marczak89c82302014-04-02 10:20:05 +02001162 CONFIG_CMD_UUID * Generate random UUID or GUID string
wdenkc6097192002-11-03 00:24:07 +00001163
1164 EXAMPLE: If you want all functions except of network
1165 support you can write:
1166
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001167 #include "config_cmd_all.h"
1168 #undef CONFIG_CMD_NET
wdenkc6097192002-11-03 00:24:07 +00001169
Gerald Van Baren213bf8c2007-03-31 12:23:51 -04001170 Other Commands:
1171 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
wdenkc6097192002-11-03 00:24:07 +00001172
1173 Note: Don't enable the "icache" and "dcache" commands
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001174 (configuration option CONFIG_CMD_CACHE) unless you know
wdenk43d96162003-03-06 00:02:04 +00001175 what you (and your U-Boot users) are doing. Data
1176 cache cannot be enabled on systems like the 8xx or
1177 8260 (where accesses to the IMMR region must be
1178 uncached), and it cannot be disabled on all other
1179 systems where we (mis-) use the data cache to hold an
1180 initial stack and some data.
wdenkc6097192002-11-03 00:24:07 +00001181
1182
1183 XXX - this list needs to get updated!
1184
Wolfgang Denka5ecbe62013-03-23 23:50:31 +00001185- Regular expression support:
1186 CONFIG_REGEX
Wolfgang Denk93e14592013-10-04 17:43:24 +02001187 If this variable is defined, U-Boot is linked against
1188 the SLRE (Super Light Regular Expression) library,
1189 which adds regex support to some commands, as for
1190 example "env grep" and "setexpr".
Wolfgang Denka5ecbe62013-03-23 23:50:31 +00001191
Simon Glass45ba8072011-10-15 05:48:20 +00001192- Device tree:
1193 CONFIG_OF_CONTROL
1194 If this variable is defined, U-Boot will use a device tree
1195 to configure its devices, instead of relying on statically
1196 compiled #defines in the board file. This option is
1197 experimental and only available on a few boards. The device
1198 tree is available in the global data as gd->fdt_blob.
1199
Simon Glass2c0f79e2011-10-24 19:15:31 +00001200 U-Boot needs to get its device tree from somewhere. This can
1201 be done using one of the two options below:
Simon Glassbbb0b122011-10-15 05:48:21 +00001202
1203 CONFIG_OF_EMBED
1204 If this variable is defined, U-Boot will embed a device tree
1205 binary in its image. This device tree file should be in the
1206 board directory and called <soc>-<board>.dts. The binary file
1207 is then picked up in board_init_f() and made available through
1208 the global data structure as gd->blob.
Simon Glass45ba8072011-10-15 05:48:20 +00001209
Simon Glass2c0f79e2011-10-24 19:15:31 +00001210 CONFIG_OF_SEPARATE
1211 If this variable is defined, U-Boot will build a device tree
1212 binary. It will be called u-boot.dtb. Architecture-specific
1213 code will locate it at run-time. Generally this works by:
1214
1215 cat u-boot.bin u-boot.dtb >image.bin
1216
1217 and in fact, U-Boot does this for you, creating a file called
1218 u-boot-dtb.bin which is useful in the common case. You can
1219 still use the individual files if you need something more
1220 exotic.
1221
wdenkc6097192002-11-03 00:24:07 +00001222- Watchdog:
1223 CONFIG_WATCHDOG
1224 If this variable is defined, it enables watchdog
Detlev Zundel6abe6fb2011-04-27 05:25:59 +00001225 support for the SoC. There must be support in the SoC
1226 specific code for a watchdog. For the 8xx and 8260
1227 CPUs, the SIU Watchdog feature is enabled in the SYPCR
1228 register. When supported for a specific SoC is
1229 available, then no further board specific code should
1230 be needed to use it.
1231
1232 CONFIG_HW_WATCHDOG
1233 When using a watchdog circuitry external to the used
1234 SoC, then define this variable and provide board
1235 specific code for the "hw_watchdog_reset" function.
wdenkc6097192002-11-03 00:24:07 +00001236
Heiko Schocher7bae0d62015-01-21 08:38:22 +01001237 CONFIG_AT91_HW_WDT_TIMEOUT
1238 specify the timeout in seconds. default 2 seconds.
1239
stroesec1551ea2003-04-04 15:53:41 +00001240- U-Boot Version:
1241 CONFIG_VERSION_VARIABLE
1242 If this variable is defined, an environment variable
1243 named "ver" is created by U-Boot showing the U-Boot
1244 version as printed by the "version" command.
Benoît Thébaudeaua1ea8e512012-08-13 15:01:14 +02001245 Any change to this variable will be reverted at the
1246 next reset.
stroesec1551ea2003-04-04 15:53:41 +00001247
wdenkc6097192002-11-03 00:24:07 +00001248- Real-Time Clock:
1249
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001250 When CONFIG_CMD_DATE is selected, the type of the RTC
wdenkc6097192002-11-03 00:24:07 +00001251 has to be selected, too. Define exactly one of the
1252 following options:
1253
1254 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
1255 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
Fabio Estevam4e8b7542011-10-24 06:44:15 +00001256 CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC
wdenkc6097192002-11-03 00:24:07 +00001257 CONFIG_RTC_MC146818 - use MC146818 RTC
wdenk1cb8e982003-03-06 21:55:29 +00001258 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
wdenkc6097192002-11-03 00:24:07 +00001259 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
wdenk7f70e852003-05-20 14:25:27 +00001260 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
Markus Niebel412921d2014-07-21 11:06:16 +02001261 CONFIG_RTC_DS1339 - use Maxim, Inc. DS1339 RTC
wdenk3bac3512003-03-12 10:41:04 +00001262 CONFIG_RTC_DS164x - use Dallas DS164x RTC
Tor Krill9536dfc2008-03-15 15:40:26 +01001263 CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
wdenk4c0d4c32004-06-09 17:34:58 +00001264 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001265 CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
Heiko Schocher71d19f32011-03-28 09:24:22 +02001266 CONFIG_SYS_RV3029_TCR - enable trickle charger on
1267 RV3029 RTC.
wdenkc6097192002-11-03 00:24:07 +00001268
wdenkb37c7e52003-06-30 16:24:52 +00001269 Note that if the RTC uses I2C, then the I2C interface
1270 must also be configured. See I2C Support, below.
1271
Peter Tysere92739d2008-12-17 16:36:21 -06001272- GPIO Support:
1273 CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
Peter Tysere92739d2008-12-17 16:36:21 -06001274
Chris Packham5dec49c2010-12-19 10:12:13 +00001275 The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
1276 chip-ngpio pairs that tell the PCA953X driver the number of
1277 pins supported by a particular chip.
1278
Peter Tysere92739d2008-12-17 16:36:21 -06001279 Note that if the GPIO device uses I2C, then the I2C interface
1280 must also be configured. See I2C Support, below.
1281
Simon Glassaa532332014-06-11 23:29:41 -06001282- I/O tracing:
1283 When CONFIG_IO_TRACE is selected, U-Boot intercepts all I/O
1284 accesses and can checksum them or write a list of them out
1285 to memory. See the 'iotrace' command for details. This is
1286 useful for testing device drivers since it can confirm that
1287 the driver behaves the same way before and after a code
1288 change. Currently this is supported on sandbox and arm. To
1289 add support for your architecture, add '#include <iotrace.h>'
1290 to the bottom of arch/<arch>/include/asm/io.h and test.
1291
1292 Example output from the 'iotrace stats' command is below.
1293 Note that if the trace buffer is exhausted, the checksum will
1294 still continue to operate.
1295
1296 iotrace is enabled
1297 Start: 10000000 (buffer start address)
1298 Size: 00010000 (buffer size)
1299 Offset: 00000120 (current buffer offset)
1300 Output: 10000120 (start + offset)
1301 Count: 00000018 (number of trace records)
1302 CRC32: 9526fb66 (CRC32 of all trace records)
1303
wdenkc6097192002-11-03 00:24:07 +00001304- Timestamp Support:
1305
wdenk43d96162003-03-06 00:02:04 +00001306 When CONFIG_TIMESTAMP is selected, the timestamp
1307 (date and time) of an image is printed by image
1308 commands like bootm or iminfo. This option is
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001309 automatically enabled when you select CONFIG_CMD_DATE .
wdenkc6097192002-11-03 00:24:07 +00001310
Karl O. Pinc923c46f2012-08-16 06:20:15 +00001311- Partition Labels (disklabels) Supported:
1312 Zero or more of the following:
1313 CONFIG_MAC_PARTITION Apple's MacOS partition table.
1314 CONFIG_DOS_PARTITION MS Dos partition table, traditional on the
1315 Intel architecture, USB sticks, etc.
1316 CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc.
1317 CONFIG_EFI_PARTITION GPT partition table, common when EFI is the
1318 bootloader. Note 2TB partition limit; see
1319 disk/part_efi.c
1320 CONFIG_MTD_PARTITIONS Memory Technology Device partition table.
wdenkc6097192002-11-03 00:24:07 +00001321
Wolfgang Denk218ca722008-03-26 10:40:12 +01001322 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1323 CONFIG_CMD_SCSI) you must configure support for at
Karl O. Pinc923c46f2012-08-16 06:20:15 +00001324 least one non-MTD partition type as well.
wdenkc6097192002-11-03 00:24:07 +00001325
1326- IDE Reset method:
wdenk4d13cba2004-03-14 14:09:05 +00001327 CONFIG_IDE_RESET_ROUTINE - this is defined in several
1328 board configurations files but used nowhere!
wdenkc6097192002-11-03 00:24:07 +00001329
wdenk4d13cba2004-03-14 14:09:05 +00001330 CONFIG_IDE_RESET - is this is defined, IDE Reset will
1331 be performed by calling the function
1332 ide_set_reset(int reset)
1333 which has to be defined in a board specific file
wdenkc6097192002-11-03 00:24:07 +00001334
1335- ATAPI Support:
1336 CONFIG_ATAPI
1337
1338 Set this to enable ATAPI support.
1339
wdenkc40b2952004-03-13 23:29:43 +00001340- LBA48 Support
1341 CONFIG_LBA48
1342
1343 Set this to enable support for disks larger than 137GB
Heiko Schocher4b142fe2009-12-03 11:21:21 +01001344 Also look at CONFIG_SYS_64BIT_LBA.
wdenkc40b2952004-03-13 23:29:43 +00001345 Whithout these , LBA48 support uses 32bit variables and will 'only'
1346 support disks up to 2.1TB.
1347
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001348 CONFIG_SYS_64BIT_LBA:
wdenkc40b2952004-03-13 23:29:43 +00001349 When enabled, makes the IDE subsystem use 64bit sector addresses.
1350 Default is 32bit.
1351
wdenkc6097192002-11-03 00:24:07 +00001352- SCSI Support:
1353 At the moment only there is only support for the
1354 SYM53C8XX SCSI controller; define
1355 CONFIG_SCSI_SYM53C8XX to enable it.
1356
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001357 CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
1358 CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
1359 CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
wdenkc6097192002-11-03 00:24:07 +00001360 maximum numbers of LUNs, SCSI ID's and target
1361 devices.
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001362 CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
wdenkc6097192002-11-03 00:24:07 +00001363
Wolfgang Denk93e14592013-10-04 17:43:24 +02001364 The environment variable 'scsidevs' is set to the number of
1365 SCSI devices found during the last scan.
Stefan Reinauer447c0312012-10-29 05:23:48 +00001366
wdenkc6097192002-11-03 00:24:07 +00001367- NETWORK Support (PCI):
wdenk682011f2003-06-03 23:54:09 +00001368 CONFIG_E1000
Kyle Moffettce5207e2011-10-18 11:05:29 +00001369 Support for Intel 8254x/8257x gigabit chips.
1370
1371 CONFIG_E1000_SPI
1372 Utility code for direct access to the SPI bus on Intel 8257x.
1373 This does not do anything useful unless you set at least one
1374 of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1375
1376 CONFIG_E1000_SPI_GENERIC
1377 Allow generic access to the SPI bus on the Intel 8257x, for
1378 example with the "sspi" command.
1379
1380 CONFIG_CMD_E1000
1381 Management command for E1000 devices. When used on devices
1382 with SPI support you can reprogram the EEPROM from U-Boot.
stroese53cf9432003-06-05 15:39:44 +00001383
Andre Schwarzac3315c2008-03-06 16:45:44 +01001384 CONFIG_E1000_FALLBACK_MAC
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001385 default MAC for empty EEPROM after production.
Andre Schwarzac3315c2008-03-06 16:45:44 +01001386
wdenkc6097192002-11-03 00:24:07 +00001387 CONFIG_EEPRO100
1388 Support for Intel 82557/82559/82559ER chips.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001389 Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
wdenkc6097192002-11-03 00:24:07 +00001390 write routine for first time initialisation.
1391
1392 CONFIG_TULIP
1393 Support for Digital 2114x chips.
1394 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1395 modem chip initialisation (KS8761/QS6611).
1396
1397 CONFIG_NATSEMI
1398 Support for National dp83815 chips.
1399
1400 CONFIG_NS8382X
1401 Support for National dp8382[01] gigabit chips.
1402
wdenk45219c42003-05-12 21:50:16 +00001403- NETWORK Support (other):
1404
Jens Scharsigc041e9d2010-01-23 12:03:45 +01001405 CONFIG_DRIVER_AT91EMAC
1406 Support for AT91RM9200 EMAC.
1407
1408 CONFIG_RMII
1409 Define this to use reduced MII inteface
1410
1411 CONFIG_DRIVER_AT91EMAC_QUIET
1412 If this defined, the driver is quiet.
1413 The driver doen't show link status messages.
1414
Rob Herringefdd7312011-12-15 11:15:49 +00001415 CONFIG_CALXEDA_XGMAC
1416 Support for the Calxeda XGMAC device
1417
Ashok3bb46d22012-10-15 06:20:47 +00001418 CONFIG_LAN91C96
wdenk45219c42003-05-12 21:50:16 +00001419 Support for SMSC's LAN91C96 chips.
1420
1421 CONFIG_LAN91C96_BASE
1422 Define this to hold the physical address
1423 of the LAN91C96's I/O space
1424
1425 CONFIG_LAN91C96_USE_32_BIT
1426 Define this to enable 32 bit addressing
1427
Ashok3bb46d22012-10-15 06:20:47 +00001428 CONFIG_SMC91111
wdenkf39748a2004-06-09 13:37:52 +00001429 Support for SMSC's LAN91C111 chip
1430
1431 CONFIG_SMC91111_BASE
1432 Define this to hold the physical address
1433 of the device (I/O space)
1434
1435 CONFIG_SMC_USE_32_BIT
1436 Define this if data bus is 32 bits
1437
1438 CONFIG_SMC_USE_IOFUNCS
1439 Define this to use i/o functions instead of macros
1440 (some hardware wont work with macros)
1441
Heiko Schocherdc02bad2011-11-15 10:00:04 -05001442 CONFIG_DRIVER_TI_EMAC
1443 Support for davinci emac
1444
1445 CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1446 Define this if you have more then 3 PHYs.
1447
Macpaul Linb3dbf4a52010-12-21 16:59:46 +08001448 CONFIG_FTGMAC100
1449 Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1450
1451 CONFIG_FTGMAC100_EGIGA
1452 Define this to use GE link update with gigabit PHY.
1453 Define this if FTGMAC100 is connected to gigabit PHY.
1454 If your system has 10/100 PHY only, it might not occur
1455 wrong behavior. Because PHY usually return timeout or
1456 useless data when polling gigabit status and gigabit
1457 control registers. This behavior won't affect the
1458 correctnessof 10/100 link speed update.
1459
Mike Rapoportc2fff332009-11-11 10:03:03 +02001460 CONFIG_SMC911X
Jens Gehrlein557b3772008-05-05 14:06:11 +02001461 Support for SMSC's LAN911x and LAN921x chips
1462
Mike Rapoportc2fff332009-11-11 10:03:03 +02001463 CONFIG_SMC911X_BASE
Jens Gehrlein557b3772008-05-05 14:06:11 +02001464 Define this to hold the physical address
1465 of the device (I/O space)
1466
Mike Rapoportc2fff332009-11-11 10:03:03 +02001467 CONFIG_SMC911X_32_BIT
Jens Gehrlein557b3772008-05-05 14:06:11 +02001468 Define this if data bus is 32 bits
1469
Mike Rapoportc2fff332009-11-11 10:03:03 +02001470 CONFIG_SMC911X_16_BIT
Jens Gehrlein557b3772008-05-05 14:06:11 +02001471 Define this if data bus is 16 bits. If your processor
1472 automatically converts one 32 bit word to two 16 bit
Mike Rapoportc2fff332009-11-11 10:03:03 +02001473 words you may also try CONFIG_SMC911X_32_BIT.
Jens Gehrlein557b3772008-05-05 14:06:11 +02001474
Yoshihiro Shimoda3d0075f2011-01-27 10:06:03 +09001475 CONFIG_SH_ETHER
1476 Support for Renesas on-chip Ethernet controller
1477
1478 CONFIG_SH_ETHER_USE_PORT
1479 Define the number of ports to be used
1480
1481 CONFIG_SH_ETHER_PHY_ADDR
1482 Define the ETH PHY's address
1483
Yoshihiro Shimoda68260aa2011-01-27 10:06:08 +09001484 CONFIG_SH_ETHER_CACHE_WRITEBACK
1485 If this option is set, the driver enables cache flush.
1486
Heiko Schocherb2f97cf2014-07-18 06:07:19 +02001487- PWM Support:
1488 CONFIG_PWM_IMX
1489 Support for PWM modul on the imx6.
1490
Vadim Bendebury5e124722011-10-17 08:36:14 +00001491- TPM Support:
Che-liang Chiou90899cc2013-04-12 11:04:34 +00001492 CONFIG_TPM
1493 Support TPM devices.
1494
Tom Wai-Hong Tam1b393db2013-04-12 11:04:37 +00001495 CONFIG_TPM_TIS_I2C
1496 Support for i2c bus TPM devices. Only one device
1497 per system is supported at this time.
1498
1499 CONFIG_TPM_TIS_I2C_BUS_NUMBER
1500 Define the the i2c bus number for the TPM device
1501
1502 CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
1503 Define the TPM's address on the i2c bus
1504
1505 CONFIG_TPM_TIS_I2C_BURST_LIMITATION
1506 Define the burst count bytes upper limit
1507
Dirk Eibachc01939c2013-06-26 15:55:15 +02001508 CONFIG_TPM_ATMEL_TWI
1509 Support for Atmel TWI TPM device. Requires I2C support.
1510
Che-liang Chiou90899cc2013-04-12 11:04:34 +00001511 CONFIG_TPM_TIS_LPC
Vadim Bendebury5e124722011-10-17 08:36:14 +00001512 Support for generic parallel port TPM devices. Only one device
1513 per system is supported at this time.
1514
1515 CONFIG_TPM_TIS_BASE_ADDRESS
1516 Base address where the generic TPM device is mapped
1517 to. Contemporary x86 systems usually map it at
1518 0xfed40000.
1519
Reinhard Pfaube6c1522013-06-26 15:55:13 +02001520 CONFIG_CMD_TPM
1521 Add tpm monitor functions.
1522 Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also
1523 provides monitor access to authorized functions.
1524
1525 CONFIG_TPM
1526 Define this to enable the TPM support library which provides
1527 functional interfaces to some TPM commands.
1528 Requires support for a TPM device.
1529
1530 CONFIG_TPM_AUTH_SESSIONS
1531 Define this to enable authorized functions in the TPM library.
1532 Requires CONFIG_TPM and CONFIG_SHA1.
1533
wdenkc6097192002-11-03 00:24:07 +00001534- USB Support:
1535 At the moment only the UHCI host controller is
wdenk4d13cba2004-03-14 14:09:05 +00001536 supported (PIP405, MIP405, MPC5200); define
wdenkc6097192002-11-03 00:24:07 +00001537 CONFIG_USB_UHCI to enable it.
1538 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
wdenk30d56fa2004-10-09 22:44:59 +00001539 and define CONFIG_USB_STORAGE to enable the USB
wdenkc6097192002-11-03 00:24:07 +00001540 storage devices.
1541 Note:
1542 Supported are USB Keyboards and USB Floppy drives
1543 (TEAC FD-05PUB).
wdenk4d13cba2004-03-14 14:09:05 +00001544 MPC5200 USB requires additional defines:
1545 CONFIG_USB_CLOCK
1546 for 528 MHz Clock: 0x0001bbbb
Eric Millbrandt307ecb62009-08-13 08:32:37 -05001547 CONFIG_PSC3_USB
1548 for USB on PSC3
wdenk4d13cba2004-03-14 14:09:05 +00001549 CONFIG_USB_CONFIG
1550 for differential drivers: 0x00001000
1551 for single ended drivers: 0x00005000
Eric Millbrandt307ecb62009-08-13 08:32:37 -05001552 for differential drivers on PSC3: 0x00000100
1553 for single ended drivers on PSC3: 0x00004100
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001554 CONFIG_SYS_USB_EVENT_POLL
Zhang Weifdcfaa12007-06-06 10:08:13 +02001555 May be defined to allow interrupt polling
1556 instead of using asynchronous interrupts
wdenk4d13cba2004-03-14 14:09:05 +00001557
Simon Glass9ab4ce22012-02-27 10:52:47 +00001558 CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
1559 txfilltuning field in the EHCI controller on reset.
1560
Oleksandr Tymoshenko6e9e0622014-02-01 21:51:25 -07001561 CONFIG_USB_DWC2_REG_ADDR the physical CPU address of the DWC2
1562 HW module registers.
1563
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001564- USB Device:
1565 Define the below if you wish to use the USB console.
1566 Once firmware is rebuilt from a serial console issue the
1567 command "setenv stdin usbtty; setenv stdout usbtty" and
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001568 attach your USB cable. The Unix command "dmesg" should print
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001569 it has found a new device. The environment variable usbtty
1570 can be set to gserial or cdc_acm to enable your device to
Wolfgang Denk386eda02006-06-14 18:14:56 +02001571 appear to a USB host as a Linux gserial device or a
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001572 Common Device Class Abstract Control Model serial device.
1573 If you select usbtty = gserial you should be able to enumerate
1574 a Linux host by
1575 # modprobe usbserial vendor=0xVendorID product=0xProductID
1576 else if using cdc_acm, simply setting the environment
1577 variable usbtty to be cdc_acm should suffice. The following
1578 might be defined in YourBoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +02001579
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001580 CONFIG_USB_DEVICE
1581 Define this to build a UDC device
wdenkc6097192002-11-03 00:24:07 +00001582
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001583 CONFIG_USB_TTY
1584 Define this to have a tty type of device available to
1585 talk to the UDC device
Wolfgang Denk386eda02006-06-14 18:14:56 +02001586
Vipin KUMARf9da0f82012-03-26 15:38:06 +05301587 CONFIG_USBD_HS
1588 Define this to enable the high speed support for usb
1589 device and usbtty. If this feature is enabled, a routine
1590 int is_usbd_high_speed(void)
1591 also needs to be defined by the driver to dynamically poll
1592 whether the enumeration has succeded at high speed or full
1593 speed.
1594
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001595 CONFIG_SYS_CONSOLE_IS_IN_ENV
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001596 Define this if you want stdin, stdout &/or stderr to
1597 be set to usbtty.
1598
1599 mpc8xx:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001600 CONFIG_SYS_USB_EXTC_CLK 0xBLAH
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001601 Derive USB clock from external clock "blah"
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001602 - CONFIG_SYS_USB_EXTC_CLK 0x02
Wolfgang Denk386eda02006-06-14 18:14:56 +02001603
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001604 CONFIG_SYS_USB_BRG_CLK 0xBLAH
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001605 Derive USB clock from brgclk
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001606 - CONFIG_SYS_USB_BRG_CLK 0x04
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001607
Wolfgang Denk386eda02006-06-14 18:14:56 +02001608 If you have a USB-IF assigned VendorID then you may wish to
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001609 define your own vendor specific values either in BoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +02001610 or directly in usbd_vendor_info.h. If you don't define
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001611 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
1612 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
1613 should pretend to be a Linux device to it's target host.
1614
1615 CONFIG_USBD_MANUFACTURER
1616 Define this string as the name of your company for
1617 - CONFIG_USBD_MANUFACTURER "my company"
Wolfgang Denk386eda02006-06-14 18:14:56 +02001618
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001619 CONFIG_USBD_PRODUCT_NAME
1620 Define this string as the name of your product
1621 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
1622
1623 CONFIG_USBD_VENDORID
1624 Define this as your assigned Vendor ID from the USB
1625 Implementors Forum. This *must* be a genuine Vendor ID
1626 to avoid polluting the USB namespace.
1627 - CONFIG_USBD_VENDORID 0xFFFF
Wolfgang Denk386eda02006-06-14 18:14:56 +02001628
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001629 CONFIG_USBD_PRODUCTID
1630 Define this as the unique Product ID
1631 for your device
1632 - CONFIG_USBD_PRODUCTID 0xFFFF
wdenkc6097192002-11-03 00:24:07 +00001633
Igor Grinbergd70a5602011-12-12 12:08:35 +02001634- ULPI Layer Support:
1635 The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1636 the generic ULPI layer. The generic layer accesses the ULPI PHY
1637 via the platform viewport, so you need both the genric layer and
1638 the viewport enabled. Currently only Chipidea/ARC based
1639 viewport is supported.
1640 To enable the ULPI layer support, define CONFIG_USB_ULPI and
1641 CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
Lucas Stach6d365ea2012-10-01 00:44:35 +02001642 If your ULPI phy needs a different reference clock than the
1643 standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
1644 the appropriate value in Hz.
wdenkc6097192002-11-03 00:24:07 +00001645
1646- MMC Support:
1647 The MMC controller on the Intel PXA is supported. To
1648 enable this define CONFIG_MMC. The MMC can be
1649 accessed from the boot prompt by mapping the device
1650 to physical memory similar to flash. Command line is
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001651 enabled with CONFIG_CMD_MMC. The MMC driver also works with
1652 the FAT fs. This is enabled with CONFIG_CMD_FAT.
wdenkc6097192002-11-03 00:24:07 +00001653
Yoshihiro Shimodaafb35662011-07-04 22:21:22 +00001654 CONFIG_SH_MMCIF
1655 Support for Renesas on-chip MMCIF controller
1656
1657 CONFIG_SH_MMCIF_ADDR
1658 Define the base address of MMCIF registers
1659
1660 CONFIG_SH_MMCIF_CLK
1661 Define the clock frequency for MMCIF
1662
Pierre Aubert1fd93c62014-04-24 10:30:08 +02001663 CONFIG_GENERIC_MMC
1664 Enable the generic MMC driver
1665
1666 CONFIG_SUPPORT_EMMC_BOOT
1667 Enable some additional features of the eMMC boot partitions.
1668
1669 CONFIG_SUPPORT_EMMC_RPMB
1670 Enable the commands for reading, writing and programming the
1671 key for the Replay Protection Memory Block partition in eMMC.
1672
Tom Rinib3ba6e92013-03-14 05:32:47 +00001673- USB Device Firmware Update (DFU) class support:
Paul Kocialkowski01acd6a2015-06-12 19:56:58 +02001674 CONFIG_USB_FUNCTION_DFU
Tom Rinib3ba6e92013-03-14 05:32:47 +00001675 This enables the USB portion of the DFU USB class
1676
1677 CONFIG_CMD_DFU
1678 This enables the command "dfu" which is used to have
1679 U-Boot create a DFU class device via USB. This command
1680 requires that the "dfu_alt_info" environment variable be
1681 set and define the alt settings to expose to the host.
1682
1683 CONFIG_DFU_MMC
1684 This enables support for exposing (e)MMC devices via DFU.
1685
Pantelis Antoniouc6631762013-03-14 05:32:52 +00001686 CONFIG_DFU_NAND
1687 This enables support for exposing NAND devices via DFU.
1688
Afzal Mohammeda9479f02013-09-18 01:15:24 +05301689 CONFIG_DFU_RAM
1690 This enables support for exposing RAM via DFU.
1691 Note: DFU spec refer to non-volatile memory usage, but
1692 allow usages beyond the scope of spec - here RAM usage,
1693 one that would help mostly the developer.
1694
Heiko Schochere7e75c72013-06-12 06:05:51 +02001695 CONFIG_SYS_DFU_DATA_BUF_SIZE
1696 Dfu transfer uses a buffer before writing data to the
1697 raw storage device. Make the size (in bytes) of this buffer
1698 configurable. The size of this buffer is also configurable
1699 through the "dfu_bufsiz" environment variable.
1700
Pantelis Antoniouea2453d2013-03-14 05:32:48 +00001701 CONFIG_SYS_DFU_MAX_FILE_SIZE
1702 When updating files rather than the raw storage device,
1703 we use a static buffer to copy the file into and then write
1704 the buffer once we've been given the whole file. Define
1705 this to the maximum filesize (in bytes) for the buffer.
1706 Default is 4 MiB if undefined.
1707
Heiko Schocher001a8312014-03-18 08:09:56 +01001708 DFU_DEFAULT_POLL_TIMEOUT
1709 Poll timeout [ms], is the timeout a device can send to the
1710 host. The host must wait for this timeout before sending
1711 a subsequent DFU_GET_STATUS request to the device.
1712
1713 DFU_MANIFEST_POLL_TIMEOUT
1714 Poll timeout [ms], which the device sends to the host when
1715 entering dfuMANIFEST state. Host waits this timeout, before
1716 sending again an USB request to the device.
1717
Sebastian Siewior3aab70a2014-05-05 15:08:10 -05001718- USB Device Android Fastboot support:
Paul Kocialkowski17da3c02015-06-12 19:56:59 +02001719 CONFIG_USB_FUNCTION_FASTBOOT
1720 This enables the USB part of the fastboot gadget
1721
Sebastian Siewior3aab70a2014-05-05 15:08:10 -05001722 CONFIG_CMD_FASTBOOT
1723 This enables the command "fastboot" which enables the Android
1724 fastboot mode for the platform's USB device. Fastboot is a USB
1725 protocol for downloading images, flashing and device control
1726 used on Android devices.
1727 See doc/README.android-fastboot for more information.
1728
1729 CONFIG_ANDROID_BOOT_IMAGE
1730 This enables support for booting images which use the Android
1731 image format header.
1732
Paul Kocialkowskia588d992015-07-20 12:38:22 +02001733 CONFIG_FASTBOOT_BUF_ADDR
Sebastian Siewior3aab70a2014-05-05 15:08:10 -05001734 The fastboot protocol requires a large memory buffer for
1735 downloads. Define this to the starting RAM address to use for
1736 downloaded images.
1737
Paul Kocialkowskia588d992015-07-20 12:38:22 +02001738 CONFIG_FASTBOOT_BUF_SIZE
Sebastian Siewior3aab70a2014-05-05 15:08:10 -05001739 The fastboot protocol requires a large memory buffer for
1740 downloads. This buffer should be as large as possible for a
1741 platform. Define this to the size available RAM for fastboot.
1742
Steve Raed1b5ed02014-08-26 11:47:28 -07001743 CONFIG_FASTBOOT_FLASH
1744 The fastboot protocol includes a "flash" command for writing
1745 the downloaded image to a non-volatile storage device. Define
1746 this to enable the "fastboot flash" command.
1747
1748 CONFIG_FASTBOOT_FLASH_MMC_DEV
1749 The fastboot "flash" command requires additional information
1750 regarding the non-volatile storage device. Define this to
1751 the eMMC device that fastboot should use to store the image.
1752
Steve Rae0ff7e582014-12-12 15:51:54 -08001753 CONFIG_FASTBOOT_GPT_NAME
1754 The fastboot "flash" command supports writing the downloaded
1755 image to the Protective MBR and the Primary GUID Partition
1756 Table. (Additionally, this downloaded image is post-processed
1757 to generate and write the Backup GUID Partition Table.)
1758 This occurs when the specified "partition name" on the
1759 "fastboot flash" command line matches this value.
1760 Default is GPT_ENTRY_NAME (currently "gpt") if undefined.
1761
wdenk6705d812004-08-02 23:22:59 +00001762- Journaling Flash filesystem support:
1763 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
1764 CONFIG_JFFS2_NAND_DEV
1765 Define these for a default partition on a NAND device
1766
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001767 CONFIG_SYS_JFFS2_FIRST_SECTOR,
1768 CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
wdenk6705d812004-08-02 23:22:59 +00001769 Define these for a default partition on a NOR device
1770
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001771 CONFIG_SYS_JFFS_CUSTOM_PART
wdenk6705d812004-08-02 23:22:59 +00001772 Define this to create an own partition. You have to provide a
1773 function struct part_info* jffs2_part_info(int part_num)
1774
1775 If you define only one JFFS2 partition you may also want to
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001776 #define CONFIG_SYS_JFFS_SINGLE_PART 1
wdenk6705d812004-08-02 23:22:59 +00001777 to disable the command chpart. This is the default when you
1778 have not defined a custom partition
1779
Donggeun Kimc30a15e2011-10-24 21:15:28 +00001780- FAT(File Allocation Table) filesystem write function support:
1781 CONFIG_FAT_WRITE
Donggeun Kim656f4c62012-03-22 04:38:56 +00001782
1783 Define this to enable support for saving memory data as a
1784 file in FAT formatted partition.
1785
1786 This will also enable the command "fatwrite" enabling the
1787 user to write files to FAT.
Donggeun Kimc30a15e2011-10-24 21:15:28 +00001788
Gabe Black84cd9322012-10-12 14:26:11 +00001789CBFS (Coreboot Filesystem) support
1790 CONFIG_CMD_CBFS
1791
1792 Define this to enable support for reading from a Coreboot
1793 filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
1794 and cbfsload.
1795
Siva Durga Prasad Paladugu4f0d1a22014-05-26 19:18:37 +05301796- FAT(File Allocation Table) filesystem cluster size:
1797 CONFIG_FS_FAT_MAX_CLUSTSIZE
1798
1799 Define the max cluster size for fat operations else
1800 a default value of 65536 will be defined.
1801
wdenkc6097192002-11-03 00:24:07 +00001802- Keyboard Support:
1803 CONFIG_ISA_KEYBOARD
1804
1805 Define this to enable standard (PC-Style) keyboard
1806 support
1807
1808 CONFIG_I8042_KBD
1809 Standard PC keyboard driver with US (is default) and
1810 GERMAN key layout (switch via environment 'keymap=de') support.
1811 Export function i8042_kbd_init, i8042_tstc and i8042_getc
1812 for cfb_console. Supports cursor blinking.
1813
Hung-ying Tyan713cb682013-05-15 18:27:32 +08001814 CONFIG_CROS_EC_KEYB
1815 Enables a Chrome OS keyboard using the CROS_EC interface.
1816 This uses CROS_EC to communicate with a second microcontroller
1817 which provides key scans on request.
1818
wdenkc6097192002-11-03 00:24:07 +00001819- Video support:
1820 CONFIG_VIDEO
1821
1822 Define this to enable video support (for output to
1823 video).
1824
1825 CONFIG_VIDEO_CT69000
1826
1827 Enable Chips & Technologies 69000 Video chip
1828
1829 CONFIG_VIDEO_SMI_LYNXEM
wdenkb79a11c2004-03-25 15:14:43 +00001830 Enable Silicon Motion SMI 712/710/810 Video chip. The
wdenkeeb1b772004-03-23 22:53:55 +00001831 video output is selected via environment 'videoout'
1832 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1833 assumed.
wdenkc6097192002-11-03 00:24:07 +00001834
wdenkb79a11c2004-03-25 15:14:43 +00001835 For the CT69000 and SMI_LYNXEM drivers, videomode is
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001836 selected via environment 'videomode'. Two different ways
wdenkeeb1b772004-03-23 22:53:55 +00001837 are possible:
1838 - "videomode=num" 'num' is a standard LiLo mode numbers.
wdenk6e592382004-04-18 17:39:38 +00001839 Following standard modes are supported (* is default):
wdenkeeb1b772004-03-23 22:53:55 +00001840
1841 Colors 640x480 800x600 1024x768 1152x864 1280x1024
1842 -------------+---------------------------------------------
1843 8 bits | 0x301* 0x303 0x305 0x161 0x307
1844 15 bits | 0x310 0x313 0x316 0x162 0x319
1845 16 bits | 0x311 0x314 0x317 0x163 0x31A
1846 24 bits | 0x312 0x315 0x318 ? 0x31B
1847 -------------+---------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00001848 (i.e. setenv videomode 317; saveenv; reset;)
1849
wdenkb79a11c2004-03-25 15:14:43 +00001850 - "videomode=bootargs" all the video parameters are parsed
Marcel Ziswiler7817cb22007-12-30 03:30:46 +01001851 from the bootargs. (See drivers/video/videomodes.c)
wdenkeeb1b772004-03-23 22:53:55 +00001852
1853
stroesec1551ea2003-04-04 15:53:41 +00001854 CONFIG_VIDEO_SED13806
wdenk43d96162003-03-06 00:02:04 +00001855 Enable Epson SED13806 driver. This driver supports 8bpp
wdenka6c7ad22002-12-03 21:28:10 +00001856 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1857 or CONFIG_VIDEO_SED13806_16BPP
1858
Timur Tabi7d3053f2011-02-15 17:09:19 -06001859 CONFIG_FSL_DIU_FB
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02001860 Enable the Freescale DIU video driver. Reference boards for
Timur Tabi7d3053f2011-02-15 17:09:19 -06001861 SOCs that have a DIU should define this macro to enable DIU
1862 support, and should also define these other macros:
1863
1864 CONFIG_SYS_DIU_ADDR
1865 CONFIG_VIDEO
1866 CONFIG_CMD_BMP
1867 CONFIG_CFB_CONSOLE
1868 CONFIG_VIDEO_SW_CURSOR
1869 CONFIG_VGA_AS_SINGLE_DEVICE
1870 CONFIG_VIDEO_LOGO
1871 CONFIG_VIDEO_BMP_LOGO
1872
Timur Tabiba8e76b2011-04-11 14:18:22 -05001873 The DIU driver will look for the 'video-mode' environment
1874 variable, and if defined, enable the DIU as a console during
1875 boot. See the documentation file README.video for a
1876 description of this variable.
Timur Tabi7d3053f2011-02-15 17:09:19 -06001877
Simon Glass058d59b2012-12-03 13:59:47 +00001878
wdenk682011f2003-06-03 23:54:09 +00001879- Keyboard Support:
wdenk8bde7f72003-06-27 21:31:46 +00001880 CONFIG_KEYBOARD
wdenk682011f2003-06-03 23:54:09 +00001881
wdenk8bde7f72003-06-27 21:31:46 +00001882 Define this to enable a custom keyboard support.
1883 This simply calls drv_keyboard_init() which must be
1884 defined in your board-specific files.
1885 The only board using this so far is RBC823.
wdenka6c7ad22002-12-03 21:28:10 +00001886
wdenkc6097192002-11-03 00:24:07 +00001887- LCD Support: CONFIG_LCD
1888
1889 Define this to enable LCD support (for output to LCD
1890 display); also select one of the supported displays
1891 by defining one of these:
1892
Stelian Pop39cf4802008-05-09 21:57:18 +02001893 CONFIG_ATMEL_LCD:
1894
1895 HITACHI TX09D70VM1CCA, 3.5", 240x320.
1896
wdenkfd3103b2003-11-25 16:55:19 +00001897 CONFIG_NEC_NL6448AC33:
wdenkc6097192002-11-03 00:24:07 +00001898
wdenkfd3103b2003-11-25 16:55:19 +00001899 NEC NL6448AC33-18. Active, color, single scan.
wdenkc6097192002-11-03 00:24:07 +00001900
wdenkfd3103b2003-11-25 16:55:19 +00001901 CONFIG_NEC_NL6448BC20
wdenkc6097192002-11-03 00:24:07 +00001902
wdenkfd3103b2003-11-25 16:55:19 +00001903 NEC NL6448BC20-08. 6.5", 640x480.
1904 Active, color, single scan.
1905
1906 CONFIG_NEC_NL6448BC33_54
1907
1908 NEC NL6448BC33-54. 10.4", 640x480.
wdenkc6097192002-11-03 00:24:07 +00001909 Active, color, single scan.
1910
1911 CONFIG_SHARP_16x9
1912
1913 Sharp 320x240. Active, color, single scan.
1914 It isn't 16x9, and I am not sure what it is.
1915
1916 CONFIG_SHARP_LQ64D341
1917
1918 Sharp LQ64D341 display, 640x480.
1919 Active, color, single scan.
1920
1921 CONFIG_HLD1045
1922
1923 HLD1045 display, 640x480.
1924 Active, color, single scan.
1925
1926 CONFIG_OPTREX_BW
1927
1928 Optrex CBL50840-2 NF-FW 99 22 M5
1929 or
1930 Hitachi LMG6912RPFC-00T
1931 or
1932 Hitachi SP14Q002
1933
1934 320x240. Black & white.
1935
1936 Normally display is black on white background; define
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001937 CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
wdenkc6097192002-11-03 00:24:07 +00001938
Simon Glass676d3192012-10-17 13:24:54 +00001939 CONFIG_LCD_ALIGNMENT
1940
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08001941 Normally the LCD is page-aligned (typically 4KB). If this is
Simon Glass676d3192012-10-17 13:24:54 +00001942 defined then the LCD will be aligned to this value instead.
1943 For ARM it is sometimes useful to use MMU_SECTION_SIZE
1944 here, since it is cheaper to change data cache settings on
1945 a per-section basis.
1946
Simon Glass0d89efe2012-10-17 13:24:59 +00001947 CONFIG_CONSOLE_SCROLL_LINES
1948
1949 When the console need to be scrolled, this is the number of
1950 lines to scroll by. It defaults to 1. Increasing this makes
1951 the console jump but can help speed up operation when scrolling
1952 is slow.
Simon Glass676d3192012-10-17 13:24:54 +00001953
Hannes Petermaier604c7d42015-03-27 08:01:38 +01001954 CONFIG_LCD_ROTATION
1955
1956 Sometimes, for example if the display is mounted in portrait
1957 mode or even if it's mounted landscape but rotated by 180degree,
1958 we need to rotate our content of the display relative to the
1959 framebuffer, so that user can read the messages which are
1960 printed out.
1961 Once CONFIG_LCD_ROTATION is defined, the lcd_console will be
1962 initialized with a given rotation from "vl_rot" out of
1963 "vidinfo_t" which is provided by the board specific code.
1964 The value for vl_rot is coded as following (matching to
1965 fbcon=rotate:<n> linux-kernel commandline):
1966 0 = no rotation respectively 0 degree
1967 1 = 90 degree rotation
1968 2 = 180 degree rotation
1969 3 = 270 degree rotation
1970
1971 If CONFIG_LCD_ROTATION is not defined, the console will be
1972 initialized with 0degree rotation.
1973
Tom Wai-Hong Tam45d7f522012-09-28 15:11:16 +00001974 CONFIG_LCD_BMP_RLE8
1975
1976 Support drawing of RLE8-compressed bitmaps on the LCD.
1977
Tom Wai-Hong Tam735987c2012-12-05 14:46:40 +00001978 CONFIG_I2C_EDID
1979
1980 Enables an 'i2c edid' command which can read EDID
1981 information over I2C from an attached LCD display.
1982
wdenk7152b1d2003-09-05 23:19:14 +00001983- Splash Screen Support: CONFIG_SPLASH_SCREEN
wdenkd791b1d2003-04-20 14:04:18 +00001984
wdenk8bde7f72003-06-27 21:31:46 +00001985 If this option is set, the environment is checked for
1986 a variable "splashimage". If found, the usual display
1987 of logo, copyright and system information on the LCD
wdenke94d2cd2004-06-30 22:59:18 +00001988 is suppressed and the BMP image at the address
wdenk8bde7f72003-06-27 21:31:46 +00001989 specified in "splashimage" is loaded instead. The
1990 console is redirected to the "nulldev", too. This
1991 allows for a "silent" boot where a splash screen is
1992 loaded very quickly after power-on.
wdenkd791b1d2003-04-20 14:04:18 +00001993
Nikita Kiryanovc0880482013-02-24 21:28:43 +00001994 CONFIG_SPLASHIMAGE_GUARD
1995
1996 If this option is set, then U-Boot will prevent the environment
1997 variable "splashimage" from being set to a problematic address
Tom Rini1551df32014-02-25 10:27:01 -05001998 (see README.displaying-bmps).
Nikita Kiryanovc0880482013-02-24 21:28:43 +00001999 This option is useful for targets where, due to alignment
2000 restrictions, an improperly aligned BMP image will cause a data
2001 abort. If you think you will not have problems with unaligned
2002 accesses (for example because your toolchain prevents them)
2003 there is no need to set this option.
2004
Matthias Weisser1ca298c2009-07-09 16:07:30 +02002005 CONFIG_SPLASH_SCREEN_ALIGN
2006
2007 If this option is set the splash image can be freely positioned
2008 on the screen. Environment variable "splashpos" specifies the
2009 position as "x,y". If a positive number is given it is used as
2010 number of pixel from left/top. If a negative number is given it
2011 is used as number of pixel from right/bottom. You can also
2012 specify 'm' for centering the image.
2013
2014 Example:
2015 setenv splashpos m,m
2016 => image at center of screen
2017
2018 setenv splashpos 30,20
2019 => image at x = 30 and y = 20
2020
2021 setenv splashpos -10,m
2022 => vertically centered image
2023 at x = dspWidth - bmpWidth - 9
2024
Stefan Roese98f4a3d2005-09-22 09:04:17 +02002025- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
2026
2027 If this option is set, additionally to standard BMP
2028 images, gzipped BMP images can be displayed via the
2029 splashscreen support or the bmp command.
2030
Anatolij Gustschind5011762010-03-15 14:50:25 +01002031- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
2032
2033 If this option is set, 8-bit RLE compressed BMP images
2034 can be displayed via the splashscreen support or the
2035 bmp command.
2036
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08002037- Do compressing for memory range:
Lei Wenf2b96df2012-09-28 04:26:47 +00002038 CONFIG_CMD_ZIP
2039
2040 If this option is set, it would use zlib deflate method
2041 to compress the specified memory at its best effort.
2042
wdenkc29fdfc2003-08-29 20:57:53 +00002043- Compression support:
Kees Cook8ef70472013-08-16 07:59:12 -07002044 CONFIG_GZIP
2045
2046 Enabled by default to support gzip compressed images.
2047
wdenkc29fdfc2003-08-29 20:57:53 +00002048 CONFIG_BZIP2
2049
2050 If this option is set, support for bzip2 compressed
2051 images is included. If not, only uncompressed and gzip
2052 compressed images are supported.
2053
wdenk42d1f032003-10-15 23:53:47 +00002054 NOTE: the bzip2 algorithm requires a lot of RAM, so
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002055 the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
wdenk42d1f032003-10-15 23:53:47 +00002056 be at least 4MB.
wdenkd791b1d2003-04-20 14:04:18 +00002057
Luigi 'Comio' Mantellinifc9c1722008-09-08 02:46:13 +02002058 CONFIG_LZMA
2059
2060 If this option is set, support for lzma compressed
2061 images is included.
2062
2063 Note: The LZMA algorithm adds between 2 and 4KB of code and it
2064 requires an amount of dynamic memory that is given by the
2065 formula:
2066
2067 (1846 + 768 << (lc + lp)) * sizeof(uint16)
2068
2069 Where lc and lp stand for, respectively, Literal context bits
2070 and Literal pos bits.
2071
2072 This value is upper-bounded by 14MB in the worst case. Anyway,
2073 for a ~4MB large kernel image, we have lc=3 and lp=0 for a
2074 total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
2075 a very small buffer.
2076
2077 Use the lzmainfo tool to determinate the lc and lp values and
2078 then calculate the amount of needed dynamic memory (ensuring
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002079 the appropriate CONFIG_SYS_MALLOC_LEN value).
Luigi 'Comio' Mantellinifc9c1722008-09-08 02:46:13 +02002080
Kees Cook8ef70472013-08-16 07:59:12 -07002081 CONFIG_LZO
2082
2083 If this option is set, support for LZO compressed images
2084 is included.
2085
wdenk17ea1172004-06-06 21:51:03 +00002086- MII/PHY support:
2087 CONFIG_PHY_ADDR
2088
2089 The address of PHY on MII bus.
2090
2091 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
2092
2093 The clock frequency of the MII bus
2094
2095 CONFIG_PHY_GIGE
2096
2097 If this option is set, support for speed/duplex
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002098 detection of gigabit PHY is included.
wdenk17ea1172004-06-06 21:51:03 +00002099
2100 CONFIG_PHY_RESET_DELAY
2101
2102 Some PHY like Intel LXT971A need extra delay after
2103 reset before any MII register access is possible.
2104 For such PHY, set this option to the usec delay
2105 required. (minimum 300usec for LXT971A)
2106
2107 CONFIG_PHY_CMD_DELAY (ppc4xx)
2108
2109 Some PHY like Intel LXT971A need extra delay after
2110 command issued before MII status register can be read
2111
wdenkc6097192002-11-03 00:24:07 +00002112- IP address:
2113 CONFIG_IPADDR
2114
2115 Define a default value for the IP address to use for
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002116 the default Ethernet interface, in case this is not
wdenkc6097192002-11-03 00:24:07 +00002117 determined through e.g. bootp.
Wolfgang Denk1ebcd652011-10-26 10:21:22 +00002118 (Environment variable "ipaddr")
wdenkc6097192002-11-03 00:24:07 +00002119
2120- Server IP address:
2121 CONFIG_SERVERIP
2122
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002123 Defines a default value for the IP address of a TFTP
wdenkc6097192002-11-03 00:24:07 +00002124 server to contact when using the "tftboot" command.
Wolfgang Denk1ebcd652011-10-26 10:21:22 +00002125 (Environment variable "serverip")
wdenkc6097192002-11-03 00:24:07 +00002126
Robin Getz97cfe862009-07-21 12:15:28 -04002127 CONFIG_KEEP_SERVERADDR
2128
2129 Keeps the server's MAC address, in the env 'serveraddr'
2130 for passing to bootargs (like Linux's netconsole option)
2131
Wolfgang Denk1ebcd652011-10-26 10:21:22 +00002132- Gateway IP address:
2133 CONFIG_GATEWAYIP
2134
2135 Defines a default value for the IP address of the
2136 default router where packets to other networks are
2137 sent to.
2138 (Environment variable "gatewayip")
2139
2140- Subnet mask:
2141 CONFIG_NETMASK
2142
2143 Defines a default value for the subnet mask (or
2144 routing prefix) which is used to determine if an IP
2145 address belongs to the local subnet or needs to be
2146 forwarded through a router.
2147 (Environment variable "netmask")
2148
David Updegraff53a5c422007-06-11 10:41:07 -05002149- Multicast TFTP Mode:
2150 CONFIG_MCAST_TFTP
2151
2152 Defines whether you want to support multicast TFTP as per
2153 rfc-2090; for example to work with atftp. Lets lots of targets
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002154 tftp down the same boot image concurrently. Note: the Ethernet
David Updegraff53a5c422007-06-11 10:41:07 -05002155 driver in use must provide a function: mcast() to join/leave a
2156 multicast group.
2157
wdenkc6097192002-11-03 00:24:07 +00002158- BOOTP Recovery Mode:
2159 CONFIG_BOOTP_RANDOM_DELAY
2160
2161 If you have many targets in a network that try to
2162 boot using BOOTP, you may want to avoid that all
2163 systems send out BOOTP requests at precisely the same
2164 moment (which would happen for instance at recovery
2165 from a power failure, when all systems will try to
2166 boot, thus flooding the BOOTP server. Defining
2167 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
2168 inserted before sending out BOOTP requests. The
Wolfgang Denk6c33c782007-08-06 23:21:05 +02002169 following delays are inserted then:
wdenkc6097192002-11-03 00:24:07 +00002170
2171 1st BOOTP request: delay 0 ... 1 sec
2172 2nd BOOTP request: delay 0 ... 2 sec
2173 3rd BOOTP request: delay 0 ... 4 sec
2174 4th and following
2175 BOOTP requests: delay 0 ... 8 sec
2176
Thierry Reding92ac8ac2014-08-19 10:21:24 +02002177 CONFIG_BOOTP_ID_CACHE_SIZE
2178
2179 BOOTP packets are uniquely identified using a 32-bit ID. The
2180 server will copy the ID from client requests to responses and
2181 U-Boot will use this to determine if it is the destination of
2182 an incoming response. Some servers will check that addresses
2183 aren't in use before handing them out (usually using an ARP
2184 ping) and therefore take up to a few hundred milliseconds to
2185 respond. Network congestion may also influence the time it
2186 takes for a response to make it back to the client. If that
2187 time is too long, U-Boot will retransmit requests. In order
2188 to allow earlier responses to still be accepted after these
2189 retransmissions, U-Boot's BOOTP client keeps a small cache of
2190 IDs. The CONFIG_BOOTP_ID_CACHE_SIZE controls the size of this
2191 cache. The default is to keep IDs for up to four outstanding
2192 requests. Increasing this will allow U-Boot to accept offers
2193 from a BOOTP client in networks with unusually high latency.
2194
stroesefe389a82003-08-28 14:17:32 +00002195- DHCP Advanced Options:
Jon Loeliger1fe80d72007-07-09 22:08:34 -05002196 You can fine tune the DHCP functionality by defining
2197 CONFIG_BOOTP_* symbols:
stroesefe389a82003-08-28 14:17:32 +00002198
Jon Loeliger1fe80d72007-07-09 22:08:34 -05002199 CONFIG_BOOTP_SUBNETMASK
2200 CONFIG_BOOTP_GATEWAY
2201 CONFIG_BOOTP_HOSTNAME
2202 CONFIG_BOOTP_NISDOMAIN
2203 CONFIG_BOOTP_BOOTPATH
2204 CONFIG_BOOTP_BOOTFILESIZE
2205 CONFIG_BOOTP_DNS
2206 CONFIG_BOOTP_DNS2
2207 CONFIG_BOOTP_SEND_HOSTNAME
2208 CONFIG_BOOTP_NTPSERVER
2209 CONFIG_BOOTP_TIMEOFFSET
2210 CONFIG_BOOTP_VENDOREX
Joe Hershberger2c00e092012-05-23 07:59:19 +00002211 CONFIG_BOOTP_MAY_FAIL
stroesefe389a82003-08-28 14:17:32 +00002212
Wilson Callan5d110f02007-07-28 10:56:13 -04002213 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
2214 environment variable, not the BOOTP server.
stroesefe389a82003-08-28 14:17:32 +00002215
Joe Hershberger2c00e092012-05-23 07:59:19 +00002216 CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
2217 after the configured retry count, the call will fail
2218 instead of starting over. This can be used to fail over
2219 to Link-local IP address configuration if the DHCP server
2220 is not available.
2221
stroesefe389a82003-08-28 14:17:32 +00002222 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
2223 serverip from a DHCP server, it is possible that more
2224 than one DNS serverip is offered to the client.
2225 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
2226 serverip will be stored in the additional environment
2227 variable "dnsip2". The first DNS serverip is always
2228 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
Jon Loeliger1fe80d72007-07-09 22:08:34 -05002229 is defined.
stroesefe389a82003-08-28 14:17:32 +00002230
2231 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
2232 to do a dynamic update of a DNS server. To do this, they
2233 need the hostname of the DHCP requester.
Wilson Callan5d110f02007-07-28 10:56:13 -04002234 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
Jon Loeliger1fe80d72007-07-09 22:08:34 -05002235 of the "hostname" environment variable is passed as
2236 option 12 to the DHCP server.
stroesefe389a82003-08-28 14:17:32 +00002237
Aras Vaichasd9a2f412008-03-26 09:43:57 +11002238 CONFIG_BOOTP_DHCP_REQUEST_DELAY
2239
2240 A 32bit value in microseconds for a delay between
2241 receiving a "DHCP Offer" and sending the "DHCP Request".
2242 This fixes a problem with certain DHCP servers that don't
2243 respond 100% of the time to a "DHCP request". E.g. On an
2244 AT91RM9200 processor running at 180MHz, this delay needed
2245 to be *at least* 15,000 usec before a Windows Server 2003
2246 DHCP server would reply 100% of the time. I recommend at
2247 least 50,000 usec to be safe. The alternative is to hope
2248 that one of the retries will be successful but note that
2249 the DHCP timeout and retry process takes a longer than
2250 this delay.
2251
Joe Hershbergerd22c3382012-05-23 08:00:12 +00002252 - Link-local IP address negotiation:
2253 Negotiate with other link-local clients on the local network
2254 for an address that doesn't require explicit configuration.
2255 This is especially useful if a DHCP server cannot be guaranteed
2256 to exist in all environments that the device must operate.
2257
2258 See doc/README.link-local for more information.
2259
wdenka3d991b2004-04-15 21:48:45 +00002260 - CDP Options:
wdenk6e592382004-04-18 17:39:38 +00002261 CONFIG_CDP_DEVICE_ID
wdenka3d991b2004-04-15 21:48:45 +00002262
2263 The device id used in CDP trigger frames.
2264
2265 CONFIG_CDP_DEVICE_ID_PREFIX
2266
2267 A two character string which is prefixed to the MAC address
2268 of the device.
2269
2270 CONFIG_CDP_PORT_ID
2271
2272 A printf format string which contains the ascii name of
2273 the port. Normally is set to "eth%d" which sets
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002274 eth0 for the first Ethernet, eth1 for the second etc.
wdenka3d991b2004-04-15 21:48:45 +00002275
2276 CONFIG_CDP_CAPABILITIES
2277
2278 A 32bit integer which indicates the device capabilities;
2279 0x00000010 for a normal host which does not forwards.
2280
2281 CONFIG_CDP_VERSION
2282
2283 An ascii string containing the version of the software.
2284
2285 CONFIG_CDP_PLATFORM
2286
2287 An ascii string containing the name of the platform.
2288
2289 CONFIG_CDP_TRIGGER
2290
2291 A 32bit integer sent on the trigger.
2292
2293 CONFIG_CDP_POWER_CONSUMPTION
2294
2295 A 16bit integer containing the power consumption of the
2296 device in .1 of milliwatts.
2297
2298 CONFIG_CDP_APPLIANCE_VLAN_TYPE
2299
2300 A byte containing the id of the VLAN.
2301
wdenkc6097192002-11-03 00:24:07 +00002302- Status LED: CONFIG_STATUS_LED
2303
2304 Several configurations allow to display the current
2305 status using a LED. For instance, the LED will blink
2306 fast while running U-Boot code, stop blinking as
2307 soon as a reply to a BOOTP request was received, and
2308 start blinking slow once the Linux kernel is running
2309 (supported by a status LED driver in the Linux
2310 kernel). Defining CONFIG_STATUS_LED enables this
2311 feature in U-Boot.
2312
Igor Grinberg1df7bbb2013-11-08 01:03:50 +02002313 Additional options:
2314
2315 CONFIG_GPIO_LED
2316 The status LED can be connected to a GPIO pin.
2317 In such cases, the gpio_led driver can be used as a
2318 status LED backend implementation. Define CONFIG_GPIO_LED
2319 to include the gpio_led driver in the U-Boot binary.
2320
Igor Grinberg9dfdcdf2013-11-08 01:03:52 +02002321 CONFIG_GPIO_LED_INVERTED_TABLE
2322 Some GPIO connected LEDs may have inverted polarity in which
2323 case the GPIO high value corresponds to LED off state and
2324 GPIO low value corresponds to LED on state.
2325 In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined
2326 with a list of GPIO LEDs that have inverted polarity.
2327
wdenkc6097192002-11-03 00:24:07 +00002328- CAN Support: CONFIG_CAN_DRIVER
2329
2330 Defining CONFIG_CAN_DRIVER enables CAN driver support
2331 on those systems that support this (optional)
2332 feature, like the TQM8xxL modules.
2333
Heiko Schocher3f4978c2012-01-16 21:12:24 +00002334- I2C Support: CONFIG_SYS_I2C
wdenkc6097192002-11-03 00:24:07 +00002335
Heiko Schocher3f4978c2012-01-16 21:12:24 +00002336 This enable the NEW i2c subsystem, and will allow you to use
2337 i2c commands at the u-boot command line (as long as you set
2338 CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
2339 based realtime clock chips or other i2c devices. See
2340 common/cmd_i2c.c for a description of the command line
2341 interface.
2342
2343 ported i2c driver to the new framework:
Heiko Schocherea818db2013-01-29 08:53:15 +01002344 - drivers/i2c/soft_i2c.c:
2345 - activate first bus with CONFIG_SYS_I2C_SOFT define
2346 CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
2347 for defining speed and slave address
2348 - activate second bus with I2C_SOFT_DECLARATIONS2 define
2349 CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2
2350 for defining speed and slave address
2351 - activate third bus with I2C_SOFT_DECLARATIONS3 define
2352 CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3
2353 for defining speed and slave address
2354 - activate fourth bus with I2C_SOFT_DECLARATIONS4 define
2355 CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4
2356 for defining speed and slave address
Heiko Schocher3f4978c2012-01-16 21:12:24 +00002357
Heiko Schocher00f792e2012-10-24 13:48:22 +02002358 - drivers/i2c/fsl_i2c.c:
2359 - activate i2c driver with CONFIG_SYS_I2C_FSL
2360 define CONFIG_SYS_FSL_I2C_OFFSET for setting the register
2361 offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and
2362 CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first
2363 bus.
Wolfgang Denk93e14592013-10-04 17:43:24 +02002364 - If your board supports a second fsl i2c bus, define
Heiko Schocher00f792e2012-10-24 13:48:22 +02002365 CONFIG_SYS_FSL_I2C2_OFFSET for the register offset
2366 CONFIG_SYS_FSL_I2C2_SPEED for the speed and
2367 CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the
2368 second bus.
2369
Simon Glass1f2ba722012-10-30 07:28:53 +00002370 - drivers/i2c/tegra_i2c.c:
Nobuhiro Iwamatsu10cee512013-10-11 16:23:53 +09002371 - activate this driver with CONFIG_SYS_I2C_TEGRA
2372 - This driver adds 4 i2c buses with a fix speed from
2373 100000 and the slave addr 0!
Simon Glass1f2ba722012-10-30 07:28:53 +00002374
Dirk Eibach880540d2013-04-25 02:40:01 +00002375 - drivers/i2c/ppc4xx_i2c.c
2376 - activate this driver with CONFIG_SYS_I2C_PPC4XX
2377 - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
2378 - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
2379
tremfac96402013-09-21 18:13:35 +02002380 - drivers/i2c/i2c_mxc.c
2381 - activate this driver with CONFIG_SYS_I2C_MXC
2382 - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED
2383 - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE
2384 - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED
2385 - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE
2386 - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED
2387 - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08002388 If those defines are not set, default value is 100000
tremfac96402013-09-21 18:13:35 +02002389 for speed, and 0 for slave.
York Sunf8cb1012015-03-20 10:20:40 -07002390 - enable bus 3 with CONFIG_SYS_I2C_MXC_I2C3
2391 - enable bus 4 with CONFIG_SYS_I2C_MXC_I2C4
tremfac96402013-09-21 18:13:35 +02002392
Nobuhiro Iwamatsu1086bfa2013-09-27 16:58:30 +09002393 - drivers/i2c/rcar_i2c.c:
2394 - activate this driver with CONFIG_SYS_I2C_RCAR
2395 - This driver adds 4 i2c buses
2396
2397 - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0
2398 - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0
2399 - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1
2400 - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1
2401 - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2
2402 - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2
2403 - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3
2404 - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3
2405 - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses
2406
Nobuhiro Iwamatsu2035d772013-10-29 13:33:51 +09002407 - drivers/i2c/sh_i2c.c:
2408 - activate this driver with CONFIG_SYS_I2C_SH
2409 - This driver adds from 2 to 5 i2c buses
2410
2411 - CONFIG_SYS_I2C_SH_BASE0 for setting the register channel 0
2412 - CONFIG_SYS_I2C_SH_SPEED0 for for the speed channel 0
2413 - CONFIG_SYS_I2C_SH_BASE1 for setting the register channel 1
2414 - CONFIG_SYS_I2C_SH_SPEED1 for for the speed channel 1
2415 - CONFIG_SYS_I2C_SH_BASE2 for setting the register channel 2
2416 - CONFIG_SYS_I2C_SH_SPEED2 for for the speed channel 2
2417 - CONFIG_SYS_I2C_SH_BASE3 for setting the register channel 3
2418 - CONFIG_SYS_I2C_SH_SPEED3 for for the speed channel 3
2419 - CONFIG_SYS_I2C_SH_BASE4 for setting the register channel 4
2420 - CONFIG_SYS_I2C_SH_SPEED4 for for the speed channel 4
2421 - CONFIG_SYS_I2C_SH_BASE5 for setting the register channel 5
2422 - CONFIG_SYS_I2C_SH_SPEED5 for for the speed channel 5
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08002423 - CONFIG_SYS_I2C_SH_NUM_CONTROLLERS for number of i2c buses
Nobuhiro Iwamatsu2035d772013-10-29 13:33:51 +09002424
Heiko Schocher6789e842013-10-22 11:03:18 +02002425 - drivers/i2c/omap24xx_i2c.c
2426 - activate this driver with CONFIG_SYS_I2C_OMAP24XX
2427 - CONFIG_SYS_OMAP24_I2C_SPEED speed channel 0
2428 - CONFIG_SYS_OMAP24_I2C_SLAVE slave addr channel 0
2429 - CONFIG_SYS_OMAP24_I2C_SPEED1 speed channel 1
2430 - CONFIG_SYS_OMAP24_I2C_SLAVE1 slave addr channel 1
2431 - CONFIG_SYS_OMAP24_I2C_SPEED2 speed channel 2
2432 - CONFIG_SYS_OMAP24_I2C_SLAVE2 slave addr channel 2
2433 - CONFIG_SYS_OMAP24_I2C_SPEED3 speed channel 3
2434 - CONFIG_SYS_OMAP24_I2C_SLAVE3 slave addr channel 3
2435 - CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4
2436 - CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4
2437
Heiko Schocher0bdffe72013-11-08 07:30:53 +01002438 - drivers/i2c/zynq_i2c.c
2439 - activate this driver with CONFIG_SYS_I2C_ZYNQ
2440 - set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting
2441 - set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr
2442
Naveen Krishna Che717fc62013-12-06 12:12:38 +05302443 - drivers/i2c/s3c24x0_i2c.c:
2444 - activate this driver with CONFIG_SYS_I2C_S3C24X0
2445 - This driver adds i2c buses (11 for Exynos5250, Exynos5420
2446 9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung)
2447 with a fix speed from 100000 and the slave addr 0!
2448
Dirk Eibachb46226b2014-07-03 09:28:18 +02002449 - drivers/i2c/ihs_i2c.c
2450 - activate this driver with CONFIG_SYS_I2C_IHS
2451 - CONFIG_SYS_I2C_IHS_CH0 activate hardware channel 0
2452 - CONFIG_SYS_I2C_IHS_SPEED_0 speed channel 0
2453 - CONFIG_SYS_I2C_IHS_SLAVE_0 slave addr channel 0
2454 - CONFIG_SYS_I2C_IHS_CH1 activate hardware channel 1
2455 - CONFIG_SYS_I2C_IHS_SPEED_1 speed channel 1
2456 - CONFIG_SYS_I2C_IHS_SLAVE_1 slave addr channel 1
2457 - CONFIG_SYS_I2C_IHS_CH2 activate hardware channel 2
2458 - CONFIG_SYS_I2C_IHS_SPEED_2 speed channel 2
2459 - CONFIG_SYS_I2C_IHS_SLAVE_2 slave addr channel 2
2460 - CONFIG_SYS_I2C_IHS_CH3 activate hardware channel 3
2461 - CONFIG_SYS_I2C_IHS_SPEED_3 speed channel 3
2462 - CONFIG_SYS_I2C_IHS_SLAVE_3 slave addr channel 3
2463
Heiko Schocher3f4978c2012-01-16 21:12:24 +00002464 additional defines:
2465
2466 CONFIG_SYS_NUM_I2C_BUSES
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08002467 Hold the number of i2c buses you want to use. If you
Heiko Schocher3f4978c2012-01-16 21:12:24 +00002468 don't use/have i2c muxes on your i2c bus, this
2469 is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can
2470 omit this define.
2471
2472 CONFIG_SYS_I2C_DIRECT_BUS
2473 define this, if you don't use i2c muxes on your hardware.
2474 if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can
2475 omit this define.
2476
2477 CONFIG_SYS_I2C_MAX_HOPS
2478 define how many muxes are maximal consecutively connected
2479 on one i2c bus. If you not use i2c muxes, omit this
2480 define.
2481
2482 CONFIG_SYS_I2C_BUSES
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08002483 hold a list of buses you want to use, only used if
Heiko Schocher3f4978c2012-01-16 21:12:24 +00002484 CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example
2485 a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and
2486 CONFIG_SYS_NUM_I2C_BUSES = 9:
2487
2488 CONFIG_SYS_I2C_BUSES {{0, {I2C_NULL_HOP}}, \
2489 {0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \
2490 {0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \
2491 {0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \
2492 {0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \
2493 {0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \
2494 {1, {I2C_NULL_HOP}}, \
2495 {1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \
2496 {1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \
2497 }
2498
2499 which defines
2500 bus 0 on adapter 0 without a mux
Heiko Schocherea818db2013-01-29 08:53:15 +01002501 bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1
2502 bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2
2503 bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3
2504 bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4
2505 bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5
Heiko Schocher3f4978c2012-01-16 21:12:24 +00002506 bus 6 on adapter 1 without a mux
Heiko Schocherea818db2013-01-29 08:53:15 +01002507 bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1
2508 bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2
Heiko Schocher3f4978c2012-01-16 21:12:24 +00002509
2510 If you do not have i2c muxes on your board, omit this define.
2511
Heiko Schocherea818db2013-01-29 08:53:15 +01002512- Legacy I2C Support: CONFIG_HARD_I2C
Heiko Schocher3f4978c2012-01-16 21:12:24 +00002513
2514 NOTE: It is intended to move drivers to CONFIG_SYS_I2C which
2515 provides the following compelling advantages:
2516
2517 - more than one i2c adapter is usable
2518 - approved multibus support
2519 - better i2c mux support
2520
2521 ** Please consider updating your I2C driver now. **
2522
Heiko Schocherea818db2013-01-29 08:53:15 +01002523 These enable legacy I2C serial bus commands. Defining
2524 CONFIG_HARD_I2C will include the appropriate I2C driver
2525 for the selected CPU.
wdenkc6097192002-11-03 00:24:07 +00002526
wdenk945af8d2003-07-16 21:53:01 +00002527 This will allow you to use i2c commands at the u-boot
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002528 command line (as long as you set CONFIG_CMD_I2C in
wdenkb37c7e52003-06-30 16:24:52 +00002529 CONFIG_COMMANDS) and communicate with i2c based realtime
2530 clock chips. See common/cmd_i2c.c for a description of the
wdenk43d96162003-03-06 00:02:04 +00002531 command line interface.
wdenkc6097192002-11-03 00:24:07 +00002532
Ben Warrenbb99ad62006-09-07 16:50:54 -04002533 CONFIG_HARD_I2C selects a hardware I2C controller.
wdenkc6097192002-11-03 00:24:07 +00002534
wdenk945af8d2003-07-16 21:53:01 +00002535 There are several other quantities that must also be
Heiko Schocherea818db2013-01-29 08:53:15 +01002536 defined when you define CONFIG_HARD_I2C.
wdenkc6097192002-11-03 00:24:07 +00002537
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002538 In both cases you will need to define CONFIG_SYS_I2C_SPEED
wdenk945af8d2003-07-16 21:53:01 +00002539 to be the frequency (in Hz) at which you wish your i2c bus
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002540 to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002541 the CPU's i2c node address).
wdenk945af8d2003-07-16 21:53:01 +00002542
Peter Tyser8d321b82010-04-12 22:28:21 -05002543 Now, the u-boot i2c code for the mpc8xx
Stefan Roesea47a12b2010-04-15 16:07:28 +02002544 (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
Peter Tyser8d321b82010-04-12 22:28:21 -05002545 and so its address should therefore be cleared to 0 (See,
2546 eg, MPC823e User's Manual p.16-473). So, set
2547 CONFIG_SYS_I2C_SLAVE to 0.
wdenkc6097192002-11-03 00:24:07 +00002548
Eric Millbrandt5da71ef2009-09-03 08:09:44 -05002549 CONFIG_SYS_I2C_INIT_MPC5XXX
2550
2551 When a board is reset during an i2c bus transfer
2552 chips might think that the current transfer is still
2553 in progress. Reset the slave devices by sending start
2554 commands until the slave device responds.
2555
wdenk945af8d2003-07-16 21:53:01 +00002556 That's all that's required for CONFIG_HARD_I2C.
wdenkb37c7e52003-06-30 16:24:52 +00002557
Heiko Schocherea818db2013-01-29 08:53:15 +01002558 If you use the software i2c interface (CONFIG_SYS_I2C_SOFT)
wdenkb37c7e52003-06-30 16:24:52 +00002559 then the following macros need to be defined (examples are
2560 from include/configs/lwmon.h):
wdenkc6097192002-11-03 00:24:07 +00002561
2562 I2C_INIT
2563
wdenkb37c7e52003-06-30 16:24:52 +00002564 (Optional). Any commands necessary to enable the I2C
wdenk43d96162003-03-06 00:02:04 +00002565 controller or configure ports.
wdenkc6097192002-11-03 00:24:07 +00002566
wdenkba56f622004-02-06 23:19:44 +00002567 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
wdenkb37c7e52003-06-30 16:24:52 +00002568
wdenkc6097192002-11-03 00:24:07 +00002569 I2C_PORT
2570
wdenk43d96162003-03-06 00:02:04 +00002571 (Only for MPC8260 CPU). The I/O port to use (the code
2572 assumes both bits are on the same port). Valid values
2573 are 0..3 for ports A..D.
wdenkc6097192002-11-03 00:24:07 +00002574
2575 I2C_ACTIVE
2576
2577 The code necessary to make the I2C data line active
2578 (driven). If the data line is open collector, this
2579 define can be null.
2580
wdenkb37c7e52003-06-30 16:24:52 +00002581 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
2582
wdenkc6097192002-11-03 00:24:07 +00002583 I2C_TRISTATE
2584
2585 The code necessary to make the I2C data line tri-stated
2586 (inactive). If the data line is open collector, this
2587 define can be null.
2588
wdenkb37c7e52003-06-30 16:24:52 +00002589 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
2590
wdenkc6097192002-11-03 00:24:07 +00002591 I2C_READ
2592
York Sun472d5462013-04-01 11:29:11 -07002593 Code that returns true if the I2C data line is high,
2594 false if it is low.
wdenkc6097192002-11-03 00:24:07 +00002595
wdenkb37c7e52003-06-30 16:24:52 +00002596 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
2597
wdenkc6097192002-11-03 00:24:07 +00002598 I2C_SDA(bit)
2599
York Sun472d5462013-04-01 11:29:11 -07002600 If <bit> is true, sets the I2C data line high. If it
2601 is false, it clears it (low).
wdenkc6097192002-11-03 00:24:07 +00002602
wdenkb37c7e52003-06-30 16:24:52 +00002603 eg: #define I2C_SDA(bit) \
wdenk2535d602003-07-17 23:16:40 +00002604 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
wdenkba56f622004-02-06 23:19:44 +00002605 else immr->im_cpm.cp_pbdat &= ~PB_SDA
wdenkb37c7e52003-06-30 16:24:52 +00002606
wdenkc6097192002-11-03 00:24:07 +00002607 I2C_SCL(bit)
2608
York Sun472d5462013-04-01 11:29:11 -07002609 If <bit> is true, sets the I2C clock line high. If it
2610 is false, it clears it (low).
wdenkc6097192002-11-03 00:24:07 +00002611
wdenkb37c7e52003-06-30 16:24:52 +00002612 eg: #define I2C_SCL(bit) \
wdenk2535d602003-07-17 23:16:40 +00002613 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
wdenkba56f622004-02-06 23:19:44 +00002614 else immr->im_cpm.cp_pbdat &= ~PB_SCL
wdenkb37c7e52003-06-30 16:24:52 +00002615
wdenkc6097192002-11-03 00:24:07 +00002616 I2C_DELAY
2617
2618 This delay is invoked four times per clock cycle so this
2619 controls the rate of data transfer. The data rate thus
wdenkb37c7e52003-06-30 16:24:52 +00002620 is 1 / (I2C_DELAY * 4). Often defined to be something
wdenk945af8d2003-07-16 21:53:01 +00002621 like:
2622
wdenkb37c7e52003-06-30 16:24:52 +00002623 #define I2C_DELAY udelay(2)
wdenkc6097192002-11-03 00:24:07 +00002624
Mike Frysinger793b5722010-07-21 13:38:02 -04002625 CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
2626
2627 If your arch supports the generic GPIO framework (asm/gpio.h),
2628 then you may alternatively define the two GPIOs that are to be
2629 used as SCL / SDA. Any of the previous I2C_xxx macros will
2630 have GPIO-based defaults assigned to them as appropriate.
2631
2632 You should define these to the GPIO value as given directly to
2633 the generic GPIO functions.
2634
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002635 CONFIG_SYS_I2C_INIT_BOARD
wdenk47cd00f2003-03-06 13:39:27 +00002636
wdenk8bde7f72003-06-27 21:31:46 +00002637 When a board is reset during an i2c bus transfer
2638 chips might think that the current transfer is still
2639 in progress. On some boards it is possible to access
2640 the i2c SCLK line directly, either by using the
2641 processor pin as a GPIO or by having a second pin
2642 connected to the bus. If this option is defined a
2643 custom i2c_init_board() routine in boards/xxx/board.c
2644 is run early in the boot sequence.
wdenk47cd00f2003-03-06 13:39:27 +00002645
Richard Retanubun26a33502010-04-12 15:08:17 -04002646 CONFIG_SYS_I2C_BOARD_LATE_INIT
2647
2648 An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
2649 defined a custom i2c_board_late_init() routine in
2650 boards/xxx/board.c is run AFTER the operations in i2c_init()
2651 is completed. This callpoint can be used to unreset i2c bus
2652 using CPU i2c controller register accesses for CPUs whose i2c
2653 controller provide such a method. It is called at the end of
2654 i2c_init() to allow i2c_init operations to setup the i2c bus
2655 controller on the CPU (e.g. setting bus speed & slave address).
2656
wdenk17ea1172004-06-06 21:51:03 +00002657 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
2658
2659 This option enables configuration of bi_iic_fast[] flags
2660 in u-boot bd_info structure based on u-boot environment
2661 variable "i2cfast". (see also i2cfast)
2662
Ben Warrenbb99ad62006-09-07 16:50:54 -04002663 CONFIG_I2C_MULTI_BUS
2664
2665 This option allows the use of multiple I2C buses, each of which
Wolfgang Denkc0f40852011-10-26 10:21:21 +00002666 must have a controller. At any point in time, only one bus is
2667 active. To switch to a different bus, use the 'i2c dev' command.
Ben Warrenbb99ad62006-09-07 16:50:54 -04002668 Note that bus numbering is zero-based.
2669
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002670 CONFIG_SYS_I2C_NOPROBES
Ben Warrenbb99ad62006-09-07 16:50:54 -04002671
2672 This option specifies a list of I2C devices that will be skipped
Wolfgang Denkc0f40852011-10-26 10:21:21 +00002673 when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
Peter Tyser0f89c542009-04-18 22:34:03 -05002674 is set, specify a list of bus-device pairs. Otherwise, specify
2675 a 1D array of device addresses
Ben Warrenbb99ad62006-09-07 16:50:54 -04002676
2677 e.g.
2678 #undef CONFIG_I2C_MULTI_BUS
Wolfgang Denkc0f40852011-10-26 10:21:21 +00002679 #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
Ben Warrenbb99ad62006-09-07 16:50:54 -04002680
2681 will skip addresses 0x50 and 0x68 on a board with one I2C bus
2682
Wolfgang Denkc0f40852011-10-26 10:21:21 +00002683 #define CONFIG_I2C_MULTI_BUS
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002684 #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
Ben Warrenbb99ad62006-09-07 16:50:54 -04002685
2686 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2687
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002688 CONFIG_SYS_SPD_BUS_NUM
Timur Tabibe5e6182006-11-03 19:15:00 -06002689
2690 If defined, then this indicates the I2C bus number for DDR SPD.
2691 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2692
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002693 CONFIG_SYS_RTC_BUS_NUM
Stefan Roese0dc018e2007-02-20 10:51:26 +01002694
2695 If defined, then this indicates the I2C bus number for the RTC.
2696 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
2697
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002698 CONFIG_SYS_DTT_BUS_NUM
Stefan Roese0dc018e2007-02-20 10:51:26 +01002699
2700 If defined, then this indicates the I2C bus number for the DTT.
2701 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
2702
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002703 CONFIG_SYS_I2C_DTT_ADDR:
Victor Gallardo9ebbb542008-09-09 15:13:29 -07002704
2705 If defined, specifies the I2C address of the DTT device.
2706 If not defined, then U-Boot uses predefined value for
2707 specified DTT device.
2708
Andrew Dyer2ac69852008-12-29 17:36:01 -06002709 CONFIG_SOFT_I2C_READ_REPEATED_START
2710
2711 defining this will force the i2c_read() function in
2712 the soft_i2c driver to perform an I2C repeated start
2713 between writing the address pointer and reading the
2714 data. If this define is omitted the default behaviour
2715 of doing a stop-start sequence will be used. Most I2C
2716 devices can use either method, but some require one or
2717 the other.
Timur Tabibe5e6182006-11-03 19:15:00 -06002718
wdenkc6097192002-11-03 00:24:07 +00002719- SPI Support: CONFIG_SPI
2720
2721 Enables SPI driver (so far only tested with
2722 SPI EEPROM, also an instance works with Crystal A/D and
2723 D/As on the SACSng board)
2724
Yoshihiro Shimoda66395622011-01-31 16:50:43 +09002725 CONFIG_SH_SPI
2726
2727 Enables the driver for SPI controller on SuperH. Currently
2728 only SH7757 is supported.
2729
wdenkc6097192002-11-03 00:24:07 +00002730 CONFIG_SPI_X
2731
2732 Enables extended (16-bit) SPI EEPROM addressing.
2733 (symmetrical to CONFIG_I2C_X)
2734
2735 CONFIG_SOFT_SPI
2736
wdenk43d96162003-03-06 00:02:04 +00002737 Enables a software (bit-bang) SPI driver rather than
2738 using hardware support. This is a general purpose
2739 driver that only requires three general I/O port pins
2740 (two outputs, one input) to function. If this is
2741 defined, the board configuration must define several
2742 SPI configuration items (port pins to use, etc). For
2743 an example, see include/configs/sacsng.h.
wdenkc6097192002-11-03 00:24:07 +00002744
Ben Warren04a9e112008-01-16 22:37:35 -05002745 CONFIG_HARD_SPI
2746
2747 Enables a hardware SPI driver for general-purpose reads
2748 and writes. As with CONFIG_SOFT_SPI, the board configuration
2749 must define a list of chip-select function pointers.
Wolfgang Denkc0f40852011-10-26 10:21:21 +00002750 Currently supported on some MPC8xxx processors. For an
Ben Warren04a9e112008-01-16 22:37:35 -05002751 example, see include/configs/mpc8349emds.h.
2752
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +02002753 CONFIG_MXC_SPI
2754
2755 Enables the driver for the SPI controllers on i.MX and MXC
Fabio Estevam2e3cd1c2011-10-28 08:57:46 +00002756 SoCs. Currently i.MX31/35/51 are supported.
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +02002757
Heiko Schocherf659b572014-07-14 10:22:11 +02002758 CONFIG_SYS_SPI_MXC_WAIT
2759 Timeout for waiting until spi transfer completed.
2760 default: (CONFIG_SYS_HZ/100) /* 10 ms */
2761
Matthias Fuchs01335022007-12-27 17:12:34 +01002762- FPGA Support: CONFIG_FPGA
2763
2764 Enables FPGA subsystem.
2765
2766 CONFIG_FPGA_<vendor>
2767
2768 Enables support for specific chip vendors.
2769 (ALTERA, XILINX)
2770
2771 CONFIG_FPGA_<family>
2772
2773 Enables support for FPGA family.
2774 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
2775
2776 CONFIG_FPGA_COUNT
wdenkc6097192002-11-03 00:24:07 +00002777
wdenk43d96162003-03-06 00:02:04 +00002778 Specify the number of FPGA devices to support.
wdenkc6097192002-11-03 00:24:07 +00002779
Siva Durga Prasad Paladugu64e809a2014-03-14 16:35:38 +05302780 CONFIG_CMD_FPGA_LOADMK
2781
2782 Enable support for fpga loadmk command
2783
Michal Simek67193862014-05-02 13:43:39 +02002784 CONFIG_CMD_FPGA_LOADP
2785
2786 Enable support for fpga loadp command - load partial bitstream
2787
2788 CONFIG_CMD_FPGA_LOADBP
2789
2790 Enable support for fpga loadbp command - load partial bitstream
2791 (Xilinx only)
2792
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002793 CONFIG_SYS_FPGA_PROG_FEEDBACK
wdenkc6097192002-11-03 00:24:07 +00002794
wdenk8bde7f72003-06-27 21:31:46 +00002795 Enable printing of hash marks during FPGA configuration.
wdenkc6097192002-11-03 00:24:07 +00002796
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002797 CONFIG_SYS_FPGA_CHECK_BUSY
wdenkc6097192002-11-03 00:24:07 +00002798
wdenk43d96162003-03-06 00:02:04 +00002799 Enable checks on FPGA configuration interface busy
2800 status by the configuration function. This option
2801 will require a board or device specific function to
2802 be written.
wdenkc6097192002-11-03 00:24:07 +00002803
2804 CONFIG_FPGA_DELAY
2805
2806 If defined, a function that provides delays in the FPGA
2807 configuration driver.
2808
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002809 CONFIG_SYS_FPGA_CHECK_CTRLC
wdenkc6097192002-11-03 00:24:07 +00002810 Allow Control-C to interrupt FPGA configuration
2811
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002812 CONFIG_SYS_FPGA_CHECK_ERROR
wdenkc6097192002-11-03 00:24:07 +00002813
wdenk43d96162003-03-06 00:02:04 +00002814 Check for configuration errors during FPGA bitfile
2815 loading. For example, abort during Virtex II
2816 configuration if the INIT_B line goes low (which
2817 indicated a CRC error).
wdenkc6097192002-11-03 00:24:07 +00002818
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002819 CONFIG_SYS_FPGA_WAIT_INIT
wdenkc6097192002-11-03 00:24:07 +00002820
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08002821 Maximum time to wait for the INIT_B line to de-assert
2822 after PROB_B has been de-asserted during a Virtex II
wdenk43d96162003-03-06 00:02:04 +00002823 FPGA configuration sequence. The default time is 500
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002824 ms.
wdenkc6097192002-11-03 00:24:07 +00002825
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002826 CONFIG_SYS_FPGA_WAIT_BUSY
wdenkc6097192002-11-03 00:24:07 +00002827
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08002828 Maximum time to wait for BUSY to de-assert during
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002829 Virtex II FPGA configuration. The default is 5 ms.
wdenkc6097192002-11-03 00:24:07 +00002830
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002831 CONFIG_SYS_FPGA_WAIT_CONFIG
wdenkc6097192002-11-03 00:24:07 +00002832
wdenk43d96162003-03-06 00:02:04 +00002833 Time to wait after FPGA configuration. The default is
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002834 200 ms.
wdenkc6097192002-11-03 00:24:07 +00002835
2836- Configuration Management:
Stefan Roeseb2b8a692014-10-22 12:13:24 +02002837 CONFIG_BUILD_TARGET
2838
2839 Some SoCs need special image types (e.g. U-Boot binary
2840 with a special header) as build targets. By defining
2841 CONFIG_BUILD_TARGET in the SoC / board header, this
2842 special image will be automatically built upon calling
2843 make / MAKEALL.
2844
wdenkc6097192002-11-03 00:24:07 +00002845 CONFIG_IDENT_STRING
2846
wdenk43d96162003-03-06 00:02:04 +00002847 If defined, this string will be added to the U-Boot
2848 version information (U_BOOT_VERSION)
wdenkc6097192002-11-03 00:24:07 +00002849
2850- Vendor Parameter Protection:
2851
wdenk43d96162003-03-06 00:02:04 +00002852 U-Boot considers the values of the environment
2853 variables "serial#" (Board Serial Number) and
wdenk7152b1d2003-09-05 23:19:14 +00002854 "ethaddr" (Ethernet Address) to be parameters that
wdenk43d96162003-03-06 00:02:04 +00002855 are set once by the board vendor / manufacturer, and
2856 protects these variables from casual modification by
2857 the user. Once set, these variables are read-only,
2858 and write or delete attempts are rejected. You can
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002859 change this behaviour:
wdenkc6097192002-11-03 00:24:07 +00002860
2861 If CONFIG_ENV_OVERWRITE is #defined in your config
2862 file, the write protection for vendor parameters is
wdenk47cd00f2003-03-06 13:39:27 +00002863 completely disabled. Anybody can change or delete
wdenkc6097192002-11-03 00:24:07 +00002864 these parameters.
2865
Joe Hershberger92ac5202015-05-04 14:55:14 -05002866 Alternatively, if you define _both_ an ethaddr in the
2867 default env _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002868 Ethernet address is installed in the environment,
wdenkc6097192002-11-03 00:24:07 +00002869 which can be changed exactly ONCE by the user. [The
2870 serial# is unaffected by this, i. e. it remains
2871 read-only.]
2872
Joe Hershberger25980902012-12-11 22:16:31 -06002873 The same can be accomplished in a more flexible way
2874 for any variable by configuring the type of access
2875 to allow for those variables in the ".flags" variable
2876 or define CONFIG_ENV_FLAGS_LIST_STATIC.
2877
wdenkc6097192002-11-03 00:24:07 +00002878- Protected RAM:
2879 CONFIG_PRAM
2880
2881 Define this variable to enable the reservation of
2882 "protected RAM", i. e. RAM which is not overwritten
2883 by U-Boot. Define CONFIG_PRAM to hold the number of
2884 kB you want to reserve for pRAM. You can overwrite
2885 this default value by defining an environment
2886 variable "pram" to the number of kB you want to
2887 reserve. Note that the board info structure will
2888 still show the full amount of RAM. If pRAM is
2889 reserved, a new environment variable "mem" will
2890 automatically be defined to hold the amount of
2891 remaining RAM in a form that can be passed as boot
2892 argument to Linux, for instance like that:
2893
Wolfgang Denkfe126d82005-11-20 21:40:11 +01002894 setenv bootargs ... mem=\${mem}
wdenkc6097192002-11-03 00:24:07 +00002895 saveenv
2896
2897 This way you can tell Linux not to use this memory,
2898 either, which results in a memory region that will
2899 not be affected by reboots.
2900
2901 *WARNING* If your board configuration uses automatic
2902 detection of the RAM size, you must make sure that
2903 this memory test is non-destructive. So far, the
2904 following board configurations are known to be
2905 "pRAM-clean":
2906
Wolfgang Denk1b0757e2012-10-24 02:36:15 +00002907 IVMS8, IVML24, SPD8xx, TQM8xxL,
2908 HERMES, IP860, RPXlite, LWMON,
Wolfgang Denk544d97e2010-10-05 22:54:53 +02002909 FLAGADM, TQM8260
wdenkc6097192002-11-03 00:24:07 +00002910
Gabe Black40fef042012-12-02 04:55:18 +00002911- Access to physical memory region (> 4GB)
2912 Some basic support is provided for operations on memory not
2913 normally accessible to U-Boot - e.g. some architectures
2914 support access to more than 4GB of memory on 32-bit
2915 machines using physical address extension or similar.
2916 Define CONFIG_PHYSMEM to access this basic support, which
2917 currently only supports clearing the memory.
2918
wdenkc6097192002-11-03 00:24:07 +00002919- Error Recovery:
2920 CONFIG_PANIC_HANG
2921
2922 Define this variable to stop the system in case of a
2923 fatal error, so that you have to reset it manually.
2924 This is probably NOT a good idea for an embedded
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002925 system where you want the system to reboot
wdenkc6097192002-11-03 00:24:07 +00002926 automatically as fast as possible, but it may be
2927 useful during development since you can try to debug
2928 the conditions that lead to the situation.
2929
2930 CONFIG_NET_RETRY_COUNT
2931
wdenk43d96162003-03-06 00:02:04 +00002932 This variable defines the number of retries for
2933 network operations like ARP, RARP, TFTP, or BOOTP
2934 before giving up the operation. If not defined, a
2935 default value of 5 is used.
wdenkc6097192002-11-03 00:24:07 +00002936
Guennadi Liakhovetski40cb90e2008-04-03 17:04:19 +02002937 CONFIG_ARP_TIMEOUT
2938
2939 Timeout waiting for an ARP reply in milliseconds.
2940
Tetsuyuki Kobayashi48a3e992012-07-03 22:25:21 +00002941 CONFIG_NFS_TIMEOUT
2942
2943 Timeout in milliseconds used in NFS protocol.
2944 If you encounter "ERROR: Cannot umount" in nfs command,
2945 try longer timeout such as
2946 #define CONFIG_NFS_TIMEOUT 10000UL
2947
wdenkc6097192002-11-03 00:24:07 +00002948- Command Interpreter:
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02002949 CONFIG_AUTO_COMPLETE
wdenk04a85b32004-04-15 18:22:41 +00002950
2951 Enable auto completion of commands using TAB.
2952
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002953 CONFIG_SYS_PROMPT_HUSH_PS2
wdenkc6097192002-11-03 00:24:07 +00002954
2955 This defines the secondary prompt string, which is
2956 printed when the command interpreter needs more input
2957 to complete a command. Usually "> ".
2958
2959 Note:
2960
wdenk8bde7f72003-06-27 21:31:46 +00002961 In the current implementation, the local variables
2962 space and global environment variables space are
2963 separated. Local variables are those you define by
2964 simply typing `name=value'. To access a local
2965 variable later on, you have write `$name' or
2966 `${name}'; to execute the contents of a variable
2967 directly type `$name' at the command prompt.
wdenkc6097192002-11-03 00:24:07 +00002968
wdenk43d96162003-03-06 00:02:04 +00002969 Global environment variables are those you use
2970 setenv/printenv to work with. To run a command stored
2971 in such a variable, you need to use the run command,
2972 and you must not use the '$' sign to access them.
wdenkc6097192002-11-03 00:24:07 +00002973
2974 To store commands and special characters in a
2975 variable, please use double quotation marks
2976 surrounding the whole text of the variable, instead
2977 of the backslashes before semicolons and special
2978 symbols.
2979
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08002980- Command Line Editing and History:
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02002981 CONFIG_CMDLINE_EDITING
2982
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002983 Enable editing and History functions for interactive
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08002984 command line input operations
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02002985
wdenka8c7c702003-12-06 19:49:23 +00002986- Default Environment:
wdenkc6097192002-11-03 00:24:07 +00002987 CONFIG_EXTRA_ENV_SETTINGS
2988
wdenk43d96162003-03-06 00:02:04 +00002989 Define this to contain any number of null terminated
2990 strings (variable = value pairs) that will be part of
wdenk7152b1d2003-09-05 23:19:14 +00002991 the default environment compiled into the boot image.
wdenk2262cfe2002-11-18 00:14:45 +00002992
wdenk43d96162003-03-06 00:02:04 +00002993 For example, place something like this in your
2994 board's config file:
wdenkc6097192002-11-03 00:24:07 +00002995
2996 #define CONFIG_EXTRA_ENV_SETTINGS \
2997 "myvar1=value1\0" \
2998 "myvar2=value2\0"
2999
wdenk43d96162003-03-06 00:02:04 +00003000 Warning: This method is based on knowledge about the
3001 internal format how the environment is stored by the
3002 U-Boot code. This is NOT an official, exported
3003 interface! Although it is unlikely that this format
wdenk7152b1d2003-09-05 23:19:14 +00003004 will change soon, there is no guarantee either.
wdenkc6097192002-11-03 00:24:07 +00003005 You better know what you are doing here.
3006
wdenk43d96162003-03-06 00:02:04 +00003007 Note: overly (ab)use of the default environment is
3008 discouraged. Make sure to check other ways to preset
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02003009 the environment like the "source" command or the
wdenk43d96162003-03-06 00:02:04 +00003010 boot command first.
wdenkc6097192002-11-03 00:24:07 +00003011
Stephen Warren5e724ca2012-05-22 09:21:54 +00003012 CONFIG_ENV_VARS_UBOOT_CONFIG
3013
3014 Define this in order to add variables describing the
3015 U-Boot build configuration to the default environment.
3016 These will be named arch, cpu, board, vendor, and soc.
3017
3018 Enabling this option will cause the following to be defined:
3019
3020 - CONFIG_SYS_ARCH
3021 - CONFIG_SYS_CPU
3022 - CONFIG_SYS_BOARD
3023 - CONFIG_SYS_VENDOR
3024 - CONFIG_SYS_SOC
3025
Tom Rini7e27f892012-10-24 07:28:16 +00003026 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
3027
3028 Define this in order to add variables describing certain
3029 run-time determined information about the hardware to the
3030 environment. These will be named board_name, board_rev.
3031
Simon Glass06fd8532012-11-30 13:01:17 +00003032 CONFIG_DELAY_ENVIRONMENT
3033
3034 Normally the environment is loaded when the board is
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08003035 initialised so that it is available to U-Boot. This inhibits
Simon Glass06fd8532012-11-30 13:01:17 +00003036 that so that the environment is not available until
3037 explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
3038 this is instead controlled by the value of
3039 /config/load-environment.
3040
Chris Packham3b10cf12015-06-19 20:25:59 +12003041- Parallel Flash support:
3042 CONFIG_SYS_NO_FLASH
3043
3044 Traditionally U-boot was run on systems with parallel NOR
3045 flash. This option is used to disable support for parallel NOR
3046 flash. This option should be defined if the board does not have
3047 parallel flash.
3048
3049 If this option is not defined one of the generic flash drivers
3050 (e.g. CONFIG_FLASH_CFI_DRIVER or CONFIG_ST_SMI) must be
3051 selected or the board must provide an implementation of the
3052 flash API (see include/flash.h).
3053
wdenka8c7c702003-12-06 19:49:23 +00003054- DataFlash Support:
wdenk2abbe072003-06-16 23:50:08 +00003055 CONFIG_HAS_DATAFLASH
3056
wdenk8bde7f72003-06-27 21:31:46 +00003057 Defining this option enables DataFlash features and
3058 allows to read/write in Dataflash via the standard
3059 commands cp, md...
wdenk2abbe072003-06-16 23:50:08 +00003060
Eric Nelsonf61ec452012-01-31 10:52:08 -07003061- Serial Flash support
3062 CONFIG_CMD_SF
3063
3064 Defining this option enables SPI flash commands
3065 'sf probe/read/write/erase/update'.
3066
3067 Usage requires an initial 'probe' to define the serial
3068 flash parameters, followed by read/write/erase/update
3069 commands.
3070
3071 The following defaults may be provided by the platform
3072 to handle the common case when only a single serial
3073 flash is present on the system.
3074
3075 CONFIG_SF_DEFAULT_BUS Bus identifier
3076 CONFIG_SF_DEFAULT_CS Chip-select
3077 CONFIG_SF_DEFAULT_MODE (see include/spi.h)
3078 CONFIG_SF_DEFAULT_SPEED in Hz
3079
Simon Glass24007272012-10-08 13:16:02 +00003080 CONFIG_CMD_SF_TEST
3081
3082 Define this option to include a destructive SPI flash
3083 test ('sf test').
3084
Jagannadha Sutradharudu Tekib902e072014-01-11 15:25:04 +05303085 CONFIG_SF_DUAL_FLASH Dual flash memories
3086
3087 Define this option to use dual flash support where two flash
3088 memories can be connected with a given cs line.
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08003089 Currently Xilinx Zynq qspi supports these type of connections.
Jagannadha Sutradharudu Tekib902e072014-01-11 15:25:04 +05303090
wdenk3f85ce22004-02-23 16:11:30 +00003091- SystemACE Support:
3092 CONFIG_SYSTEMACE
3093
3094 Adding this option adds support for Xilinx SystemACE
3095 chips attached via some sort of local bus. The address
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003096 of the chip must also be defined in the
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003097 CONFIG_SYS_SYSTEMACE_BASE macro. For example:
wdenk3f85ce22004-02-23 16:11:30 +00003098
3099 #define CONFIG_SYSTEMACE
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003100 #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
wdenk3f85ce22004-02-23 16:11:30 +00003101
3102 When SystemACE support is added, the "ace" device type
3103 becomes available to the fat commands, i.e. fatls.
3104
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02003105- TFTP Fixed UDP Port:
3106 CONFIG_TFTP_PORT
3107
Wolfgang Denk28cb9372005-09-24 23:25:46 +02003108 If this is defined, the environment variable tftpsrcp
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02003109 is used to supply the TFTP UDP source port value.
Wolfgang Denk28cb9372005-09-24 23:25:46 +02003110 If tftpsrcp isn't defined, the normal pseudo-random port
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02003111 number generator is used.
3112
Wolfgang Denk28cb9372005-09-24 23:25:46 +02003113 Also, the environment variable tftpdstp is used to supply
3114 the TFTP UDP destination port value. If tftpdstp isn't
3115 defined, the normal port 69 is used.
3116
3117 The purpose for tftpsrcp is to allow a TFTP server to
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02003118 blindly start the TFTP transfer using the pre-configured
3119 target IP address and UDP port. This has the effect of
3120 "punching through" the (Windows XP) firewall, allowing
3121 the remainder of the TFTP transfer to proceed normally.
3122 A better solution is to properly configure the firewall,
3123 but sometimes that is not allowed.
3124
Simon Glassbf36c5d2012-12-05 14:46:38 +00003125- Hashing support:
3126 CONFIG_CMD_HASH
3127
3128 This enables a generic 'hash' command which can produce
3129 hashes / digests from a few algorithms (e.g. SHA1, SHA256).
3130
3131 CONFIG_HASH_VERIFY
3132
3133 Enable the hash verify command (hash -v). This adds to code
3134 size a little.
3135
gaurav rana94e3c8c2015-02-20 12:51:46 +05303136 CONFIG_SHA1 - This option enables support of hashing using SHA1
3137 algorithm. The hash is calculated in software.
3138 CONFIG_SHA256 - This option enables support of hashing using
3139 SHA256 algorithm. The hash is calculated in software.
3140 CONFIG_SHA_HW_ACCEL - This option enables hardware acceleration
3141 for SHA1/SHA256 hashing.
3142 This affects the 'hash' command and also the
3143 hash_lookup_algo() function.
3144 CONFIG_SHA_PROG_HW_ACCEL - This option enables
3145 hardware-acceleration for SHA1/SHA256 progressive hashing.
3146 Data can be streamed in a block at a time and the hashing
3147 is performed in hardware.
Simon Glassbf36c5d2012-12-05 14:46:38 +00003148
3149 Note: There is also a sha1sum command, which should perhaps
3150 be deprecated in favour of 'hash sha1'.
3151
Robert Winklera11f1872013-07-24 17:57:06 -07003152- Freescale i.MX specific commands:
3153 CONFIG_CMD_HDMIDETECT
3154 This enables 'hdmidet' command which returns true if an
3155 HDMI monitor is detected. This command is i.MX 6 specific.
3156
3157 CONFIG_CMD_BMODE
3158 This enables the 'bmode' (bootmode) command for forcing
3159 a boot from specific media.
3160
3161 This is useful for forcing the ROM's usb downloader to
3162 activate upon a watchdog reset which is nice when iterating
3163 on U-Boot. Using the reset button or running bmode normal
3164 will set it back to normal. This command currently
3165 supports i.MX53 and i.MX6.
3166
Simon Glass19c402a2013-06-13 15:10:02 -07003167- Signing support:
3168 CONFIG_RSA
3169
3170 This enables the RSA algorithm used for FIT image verification
Detlev Zundel8bf2aad2014-01-20 16:21:46 +01003171 in U-Boot. See doc/uImage.FIT/signature.txt for more information.
Simon Glass19c402a2013-06-13 15:10:02 -07003172
Ruchika Guptac937ff62015-01-23 16:01:54 +05303173 The Modular Exponentiation algorithm in RSA is implemented using
3174 driver model. So CONFIG_DM needs to be enabled by default for this
3175 library to function.
3176
Simon Glass19c402a2013-06-13 15:10:02 -07003177 The signing part is build into mkimage regardless of this
Ruchika Guptac937ff62015-01-23 16:01:54 +05303178 option. The software based modular exponentiation is built into
3179 mkimage irrespective of this option.
Simon Glass19c402a2013-06-13 15:10:02 -07003180
Heiko Schocher9e50c402014-01-25 07:27:13 +01003181- bootcount support:
3182 CONFIG_BOOTCOUNT_LIMIT
3183
3184 This enables the bootcounter support, see:
3185 http://www.denx.de/wiki/DULG/UBootBootCountLimit
3186
3187 CONFIG_AT91SAM9XE
3188 enable special bootcounter support on at91sam9xe based boards.
3189 CONFIG_BLACKFIN
3190 enable special bootcounter support on blackfin based boards.
3191 CONFIG_SOC_DA8XX
3192 enable special bootcounter support on da850 based boards.
3193 CONFIG_BOOTCOUNT_RAM
3194 enable support for the bootcounter in RAM
3195 CONFIG_BOOTCOUNT_I2C
3196 enable support for the bootcounter on an i2c (like RTC) device.
3197 CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
3198 CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
3199 the bootcounter.
3200 CONFIG_BOOTCOUNT_ALEN = address len
Simon Glass19c402a2013-06-13 15:10:02 -07003201
wdenka8c7c702003-12-06 19:49:23 +00003202- Show boot progress:
wdenkc6097192002-11-03 00:24:07 +00003203 CONFIG_SHOW_BOOT_PROGRESS
3204
wdenk43d96162003-03-06 00:02:04 +00003205 Defining this option allows to add some board-
3206 specific code (calling a user-provided function
3207 "show_boot_progress(int)") that enables you to show
3208 the system's boot progress on some display (for
3209 example, some LED's) on your board. At the moment,
3210 the following checkpoints are implemented:
wdenkc6097192002-11-03 00:24:07 +00003211
Simon Glass94fd1312012-09-28 08:56:37 +00003212
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003213Legacy uImage format:
3214
wdenkc6097192002-11-03 00:24:07 +00003215 Arg Where When
3216 1 common/cmd_bootm.c before attempting to boot an image
wdenkba56f622004-02-06 23:19:44 +00003217 -1 common/cmd_bootm.c Image header has bad magic number
wdenkc6097192002-11-03 00:24:07 +00003218 2 common/cmd_bootm.c Image header has correct magic number
wdenkba56f622004-02-06 23:19:44 +00003219 -2 common/cmd_bootm.c Image header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00003220 3 common/cmd_bootm.c Image header has correct checksum
wdenkba56f622004-02-06 23:19:44 +00003221 -3 common/cmd_bootm.c Image data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00003222 4 common/cmd_bootm.c Image data has correct checksum
3223 -4 common/cmd_bootm.c Image is for unsupported architecture
3224 5 common/cmd_bootm.c Architecture check OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003225 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
wdenkc6097192002-11-03 00:24:07 +00003226 6 common/cmd_bootm.c Image Type check OK
3227 -6 common/cmd_bootm.c gunzip uncompression error
3228 -7 common/cmd_bootm.c Unimplemented compression type
3229 7 common/cmd_bootm.c Uncompression OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003230 8 common/cmd_bootm.c No uncompress/copy overwrite error
wdenkc6097192002-11-03 00:24:07 +00003231 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003232
3233 9 common/image.c Start initial ramdisk verification
3234 -10 common/image.c Ramdisk header has bad magic number
3235 -11 common/image.c Ramdisk header has bad checksum
3236 10 common/image.c Ramdisk header is OK
3237 -12 common/image.c Ramdisk data has bad checksum
3238 11 common/image.c Ramdisk data has correct checksum
3239 12 common/image.c Ramdisk verification complete, start loading
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003240 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003241 13 common/image.c Start multifile image verification
3242 14 common/image.c No initial ramdisk, no multifile, continue.
3243
Wolfgang Denkc0f40852011-10-26 10:21:21 +00003244 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
wdenkc6097192002-11-03 00:24:07 +00003245
Stefan Roesea47a12b2010-04-15 16:07:28 +02003246 -30 arch/powerpc/lib/board.c Fatal error, hang the system
wdenk11dadd542004-02-27 00:07:27 +00003247 -31 post/post.c POST test failed, detected by post_output_backlog()
3248 -32 post/post.c POST test failed, detected by post_run_single()
wdenk63e73c92004-02-23 22:22:28 +00003249
Heiko Schocher566a4942007-06-22 19:11:54 +02003250 34 common/cmd_doc.c before loading a Image from a DOC device
3251 -35 common/cmd_doc.c Bad usage of "doc" command
3252 35 common/cmd_doc.c correct usage of "doc" command
3253 -36 common/cmd_doc.c No boot device
3254 36 common/cmd_doc.c correct boot device
3255 -37 common/cmd_doc.c Unknown Chip ID on boot device
3256 37 common/cmd_doc.c correct chip ID found, device available
3257 -38 common/cmd_doc.c Read Error on boot device
3258 38 common/cmd_doc.c reading Image header from DOC device OK
3259 -39 common/cmd_doc.c Image header has bad magic number
3260 39 common/cmd_doc.c Image header has correct magic number
3261 -40 common/cmd_doc.c Error reading Image from DOC device
3262 40 common/cmd_doc.c Image header has correct magic number
3263 41 common/cmd_ide.c before loading a Image from a IDE device
3264 -42 common/cmd_ide.c Bad usage of "ide" command
3265 42 common/cmd_ide.c correct usage of "ide" command
3266 -43 common/cmd_ide.c No boot device
3267 43 common/cmd_ide.c boot device found
3268 -44 common/cmd_ide.c Device not available
3269 44 common/cmd_ide.c Device available
3270 -45 common/cmd_ide.c wrong partition selected
3271 45 common/cmd_ide.c partition selected
3272 -46 common/cmd_ide.c Unknown partition table
3273 46 common/cmd_ide.c valid partition table found
3274 -47 common/cmd_ide.c Invalid partition type
3275 47 common/cmd_ide.c correct partition type
3276 -48 common/cmd_ide.c Error reading Image Header on boot device
3277 48 common/cmd_ide.c reading Image Header from IDE device OK
3278 -49 common/cmd_ide.c Image header has bad magic number
3279 49 common/cmd_ide.c Image header has correct magic number
3280 -50 common/cmd_ide.c Image header has bad checksum
3281 50 common/cmd_ide.c Image header has correct checksum
3282 -51 common/cmd_ide.c Error reading Image from IDE device
3283 51 common/cmd_ide.c reading Image from IDE device OK
3284 52 common/cmd_nand.c before loading a Image from a NAND device
3285 -53 common/cmd_nand.c Bad usage of "nand" command
3286 53 common/cmd_nand.c correct usage of "nand" command
3287 -54 common/cmd_nand.c No boot device
3288 54 common/cmd_nand.c boot device found
3289 -55 common/cmd_nand.c Unknown Chip ID on boot device
3290 55 common/cmd_nand.c correct chip ID found, device available
3291 -56 common/cmd_nand.c Error reading Image Header on boot device
3292 56 common/cmd_nand.c reading Image Header from NAND device OK
3293 -57 common/cmd_nand.c Image header has bad magic number
3294 57 common/cmd_nand.c Image header has correct magic number
3295 -58 common/cmd_nand.c Error reading Image from NAND device
3296 58 common/cmd_nand.c reading Image from NAND device OK
wdenkc6097192002-11-03 00:24:07 +00003297
Heiko Schocher566a4942007-06-22 19:11:54 +02003298 -60 common/env_common.c Environment has a bad CRC, using default
wdenkc6097192002-11-03 00:24:07 +00003299
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003300 64 net/eth.c starting with Ethernet configuration.
Heiko Schocher566a4942007-06-22 19:11:54 +02003301 -64 net/eth.c no Ethernet found.
3302 65 net/eth.c Ethernet found.
wdenk206c60c2003-09-18 10:02:25 +00003303
Heiko Schocher566a4942007-06-22 19:11:54 +02003304 -80 common/cmd_net.c usage wrong
Joe Hershbergerbc0571f2015-04-08 01:41:21 -05003305 80 common/cmd_net.c before calling net_loop()
3306 -81 common/cmd_net.c some error in net_loop() occurred
3307 81 common/cmd_net.c net_loop() back without error
Heiko Schocher566a4942007-06-22 19:11:54 +02003308 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
3309 82 common/cmd_net.c trying automatic boot
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02003310 83 common/cmd_net.c running "source" command
3311 -83 common/cmd_net.c some error in automatic boot or "source" command
Heiko Schocher566a4942007-06-22 19:11:54 +02003312 84 common/cmd_net.c end without errors
wdenkc6097192002-11-03 00:24:07 +00003313
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003314FIT uImage format:
3315
3316 Arg Where When
3317 100 common/cmd_bootm.c Kernel FIT Image has correct format
3318 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
3319 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
3320 -101 common/cmd_bootm.c Can't get configuration for kernel subimage
3321 102 common/cmd_bootm.c Kernel unit name specified
3322 -103 common/cmd_bootm.c Can't get kernel subimage node offset
Marian Balakowiczf773bea2008-03-12 10:35:46 +01003323 103 common/cmd_bootm.c Found configuration node
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003324 104 common/cmd_bootm.c Got kernel subimage node offset
3325 -104 common/cmd_bootm.c Kernel subimage hash verification failed
3326 105 common/cmd_bootm.c Kernel subimage hash verification OK
3327 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
3328 106 common/cmd_bootm.c Architecture check OK
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003329 -106 common/cmd_bootm.c Kernel subimage has wrong type
3330 107 common/cmd_bootm.c Kernel subimage type OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003331 -107 common/cmd_bootm.c Can't get kernel subimage data/size
3332 108 common/cmd_bootm.c Got kernel subimage data/size
3333 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
3334 -109 common/cmd_bootm.c Can't get kernel subimage type
3335 -110 common/cmd_bootm.c Can't get kernel subimage comp
3336 -111 common/cmd_bootm.c Can't get kernel subimage os
3337 -112 common/cmd_bootm.c Can't get kernel subimage load address
3338 -113 common/cmd_bootm.c Image uncompress/copy overwrite error
3339
3340 120 common/image.c Start initial ramdisk verification
3341 -120 common/image.c Ramdisk FIT image has incorrect format
3342 121 common/image.c Ramdisk FIT image has correct format
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003343 122 common/image.c No ramdisk subimage unit name, using configuration
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003344 -122 common/image.c Can't get configuration for ramdisk subimage
3345 123 common/image.c Ramdisk unit name specified
3346 -124 common/image.c Can't get ramdisk subimage node offset
3347 125 common/image.c Got ramdisk subimage node offset
3348 -125 common/image.c Ramdisk subimage hash verification failed
3349 126 common/image.c Ramdisk subimage hash verification OK
3350 -126 common/image.c Ramdisk subimage for unsupported architecture
3351 127 common/image.c Architecture check OK
3352 -127 common/image.c Can't get ramdisk subimage data/size
3353 128 common/image.c Got ramdisk subimage data/size
3354 129 common/image.c Can't get ramdisk load address
3355 -129 common/image.c Got ramdisk load address
3356
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003357 -130 common/cmd_doc.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003358 131 common/cmd_doc.c FIT image format OK
3359
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003360 -140 common/cmd_ide.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003361 141 common/cmd_ide.c FIT image format OK
3362
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003363 -150 common/cmd_nand.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003364 151 common/cmd_nand.c FIT image format OK
3365
Heiko Schocher21d29f72014-05-28 11:33:33 +02003366- legacy image format:
3367 CONFIG_IMAGE_FORMAT_LEGACY
3368 enables the legacy image format support in U-Boot.
3369
3370 Default:
3371 enabled if CONFIG_FIT_SIGNATURE is not defined.
3372
3373 CONFIG_DISABLE_IMAGE_LEGACY
3374 disable the legacy image format
3375
3376 This define is introduced, as the legacy image format is
3377 enabled per default for backward compatibility.
3378
Gabe Blackd95f6ec2012-10-25 16:31:10 +00003379- FIT image support:
3380 CONFIG_FIT
3381 Enable support for the FIT uImage format.
3382
3383 CONFIG_FIT_BEST_MATCH
3384 When no configuration is explicitly selected, default to the
3385 one whose fdt's compatibility field best matches that of
3386 U-Boot itself. A match is considered "best" if it matches the
3387 most specific compatibility entry of U-Boot's fdt's root node.
3388 The order of entries in the configuration's fdt is ignored.
3389
Simon Glass3e569a62013-06-13 15:10:00 -07003390 CONFIG_FIT_SIGNATURE
3391 This option enables signature verification of FIT uImages,
gaurav rana94e3c8c2015-02-20 12:51:46 +05303392 using a hash signed and verified using RSA. If
3393 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
3394 hashing is available using hardware, RSA library will use it.
3395 See doc/uImage.FIT/signature.txt for more details.
Simon Glass3e569a62013-06-13 15:10:00 -07003396
Heiko Schocher21d29f72014-05-28 11:33:33 +02003397 WARNING: When relying on signed FIT images with required
3398 signature check the legacy image format is default
3399 disabled. If a board need legacy image format support
3400 enable this through CONFIG_IMAGE_FORMAT_LEGACY
3401
Dirk Eibach9a4f4792014-07-03 09:28:26 +02003402 CONFIG_FIT_DISABLE_SHA256
3403 Supporting SHA256 hashes has quite an impact on binary size.
3404 For constrained systems sha256 hash support can be disabled
3405 with this option.
3406
Wolfgang Denk4cf26092011-10-07 09:58:21 +02003407- Standalone program support:
3408 CONFIG_STANDALONE_LOAD_ADDR
3409
Wolfgang Denk6feff892011-10-09 21:06:34 +02003410 This option defines a board specific value for the
3411 address where standalone program gets loaded, thus
3412 overwriting the architecture dependent default
Wolfgang Denk4cf26092011-10-07 09:58:21 +02003413 settings.
3414
3415- Frame Buffer Address:
3416 CONFIG_FB_ADDR
3417
3418 Define CONFIG_FB_ADDR if you want to use specific
Wolfgang Denk44a53b52013-01-03 00:43:59 +00003419 address for frame buffer. This is typically the case
3420 when using a graphics controller has separate video
3421 memory. U-Boot will then place the frame buffer at
3422 the given address instead of dynamically reserving it
3423 in system RAM by calling lcd_setmem(), which grabs
3424 the memory for the frame buffer depending on the
3425 configured panel size.
Wolfgang Denk4cf26092011-10-07 09:58:21 +02003426
3427 Please see board_init_f function.
3428
Detlev Zundelcccfc2a2009-12-01 17:16:19 +01003429- Automatic software updates via TFTP server
3430 CONFIG_UPDATE_TFTP
3431 CONFIG_UPDATE_TFTP_CNT_MAX
3432 CONFIG_UPDATE_TFTP_MSEC_MAX
3433
3434 These options enable and control the auto-update feature;
3435 for a more detailed description refer to doc/README.update.
3436
3437- MTD Support (mtdparts command, UBI support)
3438 CONFIG_MTD_DEVICE
3439
3440 Adds the MTD device infrastructure from the Linux kernel.
3441 Needed for mtdparts command support.
3442
3443 CONFIG_MTD_PARTITIONS
3444
3445 Adds the MTD partitioning infrastructure from the Linux
3446 kernel. Needed for UBI support.
3447
Joe Hershberger70c219c2013-04-08 10:32:48 +00003448- UBI support
3449 CONFIG_CMD_UBI
3450
3451 Adds commands for interacting with MTD partitions formatted
3452 with the UBI flash translation layer
3453
3454 Requires also defining CONFIG_RBTREE
3455
Joe Hershberger147162d2013-04-08 10:32:49 +00003456 CONFIG_UBI_SILENCE_MSG
3457
3458 Make the verbose messages from UBI stop printing. This leaves
3459 warnings and errors enabled.
3460
Heiko Schocherff94bc42014-06-24 10:10:04 +02003461
3462 CONFIG_MTD_UBI_WL_THRESHOLD
3463 This parameter defines the maximum difference between the highest
3464 erase counter value and the lowest erase counter value of eraseblocks
3465 of UBI devices. When this threshold is exceeded, UBI starts performing
3466 wear leveling by means of moving data from eraseblock with low erase
3467 counter to eraseblocks with high erase counter.
3468
3469 The default value should be OK for SLC NAND flashes, NOR flashes and
3470 other flashes which have eraseblock life-cycle 100000 or more.
3471 However, in case of MLC NAND flashes which typically have eraseblock
3472 life-cycle less than 10000, the threshold should be lessened (e.g.,
3473 to 128 or 256, although it does not have to be power of 2).
3474
3475 default: 4096
Simon Glassc654b512014-10-23 18:58:54 -06003476
Heiko Schocherff94bc42014-06-24 10:10:04 +02003477 CONFIG_MTD_UBI_BEB_LIMIT
3478 This option specifies the maximum bad physical eraseblocks UBI
3479 expects on the MTD device (per 1024 eraseblocks). If the
3480 underlying flash does not admit of bad eraseblocks (e.g. NOR
3481 flash), this value is ignored.
3482
3483 NAND datasheets often specify the minimum and maximum NVM
3484 (Number of Valid Blocks) for the flashes' endurance lifetime.
3485 The maximum expected bad eraseblocks per 1024 eraseblocks
3486 then can be calculated as "1024 * (1 - MinNVB / MaxNVB)",
3487 which gives 20 for most NANDs (MaxNVB is basically the total
3488 count of eraseblocks on the chip).
3489
3490 To put it differently, if this value is 20, UBI will try to
3491 reserve about 1.9% of physical eraseblocks for bad blocks
3492 handling. And that will be 1.9% of eraseblocks on the entire
3493 NAND chip, not just the MTD partition UBI attaches. This means
3494 that if you have, say, a NAND flash chip admits maximum 40 bad
3495 eraseblocks, and it is split on two MTD partitions of the same
3496 size, UBI will reserve 40 eraseblocks when attaching a
3497 partition.
3498
3499 default: 20
3500
3501 CONFIG_MTD_UBI_FASTMAP
3502 Fastmap is a mechanism which allows attaching an UBI device
3503 in nearly constant time. Instead of scanning the whole MTD device it
3504 only has to locate a checkpoint (called fastmap) on the device.
3505 The on-flash fastmap contains all information needed to attach
3506 the device. Using fastmap makes only sense on large devices where
3507 attaching by scanning takes long. UBI will not automatically install
3508 a fastmap on old images, but you can set the UBI parameter
3509 CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT to 1 if you want so. Please note
3510 that fastmap-enabled images are still usable with UBI implementations
3511 without fastmap support. On typical flash devices the whole fastmap
3512 fits into one PEB. UBI will reserve PEBs to hold two fastmaps.
3513
3514 CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT
3515 Set this parameter to enable fastmap automatically on images
3516 without a fastmap.
3517 default: 0
3518
Joe Hershberger70c219c2013-04-08 10:32:48 +00003519- UBIFS support
3520 CONFIG_CMD_UBIFS
3521
3522 Adds commands for interacting with UBI volumes formatted as
3523 UBIFS. UBIFS is read-only in u-boot.
3524
3525 Requires UBI support as well as CONFIG_LZO
3526
Joe Hershberger147162d2013-04-08 10:32:49 +00003527 CONFIG_UBIFS_SILENCE_MSG
3528
3529 Make the verbose messages from UBIFS stop printing. This leaves
3530 warnings and errors enabled.
3531
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003532- SPL framework
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003533 CONFIG_SPL
3534 Enable building of SPL globally.
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003535
Tom Rini95579792012-02-14 07:29:40 +00003536 CONFIG_SPL_LDSCRIPT
3537 LDSCRIPT for linking the SPL binary.
3538
Albert ARIBAUD6ebc3462013-04-12 05:14:30 +00003539 CONFIG_SPL_MAX_FOOTPRINT
3540 Maximum size in memory allocated to the SPL, BSS included.
3541 When defined, the linker checks that the actual memory
3542 used by SPL from _start to __bss_end does not exceed it.
Albert ARIBAUD8960af82013-04-14 04:48:38 +00003543 CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
Albert ARIBAUD6ebc3462013-04-12 05:14:30 +00003544 must not be both defined at the same time.
3545
Tom Rini95579792012-02-14 07:29:40 +00003546 CONFIG_SPL_MAX_SIZE
Albert ARIBAUD6ebc3462013-04-12 05:14:30 +00003547 Maximum size of the SPL image (text, data, rodata, and
3548 linker lists sections), BSS excluded.
3549 When defined, the linker checks that the actual size does
3550 not exceed it.
Tom Rini95579792012-02-14 07:29:40 +00003551
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003552 CONFIG_SPL_TEXT_BASE
3553 TEXT_BASE for linking the SPL binary.
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003554
Scott Wood94a45bb2012-09-20 19:05:12 -05003555 CONFIG_SPL_RELOC_TEXT_BASE
3556 Address to relocate to. If unspecified, this is equal to
3557 CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
3558
Tom Rini95579792012-02-14 07:29:40 +00003559 CONFIG_SPL_BSS_START_ADDR
3560 Link address for the BSS within the SPL binary.
3561
3562 CONFIG_SPL_BSS_MAX_SIZE
Albert ARIBAUD6ebc3462013-04-12 05:14:30 +00003563 Maximum size in memory allocated to the SPL BSS.
3564 When defined, the linker checks that the actual memory used
3565 by SPL from __bss_start to __bss_end does not exceed it.
Albert ARIBAUD8960af82013-04-14 04:48:38 +00003566 CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
Albert ARIBAUD6ebc3462013-04-12 05:14:30 +00003567 must not be both defined at the same time.
Tom Rini95579792012-02-14 07:29:40 +00003568
3569 CONFIG_SPL_STACK
3570 Adress of the start of the stack SPL will use
3571
Albert ARIBAUD \(3ADEV\)8c80eb32015-03-31 11:40:50 +02003572 CONFIG_SPL_PANIC_ON_RAW_IMAGE
3573 When defined, SPL will panic() if the image it has
3574 loaded does not have a signature.
3575 Defining this is useful when code which loads images
3576 in SPL cannot guarantee that absolutely all read errors
3577 will be caught.
3578 An example is the LPC32XX MLC NAND driver, which will
3579 consider that a completely unreadable NAND block is bad,
3580 and thus should be skipped silently.
3581
Scott Wood94a45bb2012-09-20 19:05:12 -05003582 CONFIG_SPL_RELOC_STACK
3583 Adress of the start of the stack SPL will use after
3584 relocation. If unspecified, this is equal to
3585 CONFIG_SPL_STACK.
3586
Tom Rini95579792012-02-14 07:29:40 +00003587 CONFIG_SYS_SPL_MALLOC_START
3588 Starting address of the malloc pool used in SPL.
3589
3590 CONFIG_SYS_SPL_MALLOC_SIZE
3591 The size of the malloc pool used in SPL.
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003592
Tom Rini47f7bca2012-08-13 12:03:19 -07003593 CONFIG_SPL_FRAMEWORK
3594 Enable the SPL framework under common/. This framework
3595 supports MMC, NAND and YMODEM loading of U-Boot and NAND
3596 NAND loading of the Linux Kernel.
3597
Tom Rini9607faf2014-03-28 12:03:39 -04003598 CONFIG_SPL_OS_BOOT
3599 Enable booting directly to an OS from SPL.
3600 See also: doc/README.falcon
3601
Tom Rini861a86f2012-08-13 11:37:56 -07003602 CONFIG_SPL_DISPLAY_PRINT
3603 For ARM, enable an optional function to print more information
3604 about the running system.
3605
Scott Wood4b919722012-09-20 16:35:21 -05003606 CONFIG_SPL_INIT_MINIMAL
3607 Arch init code should be built for a very small image
3608
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003609 CONFIG_SPL_LIBCOMMON_SUPPORT
3610 Support for common/libcommon.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003611
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003612 CONFIG_SPL_LIBDISK_SUPPORT
3613 Support for disk/libdisk.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003614
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003615 CONFIG_SPL_I2C_SUPPORT
3616 Support for drivers/i2c/libi2c.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003617
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003618 CONFIG_SPL_GPIO_SUPPORT
3619 Support for drivers/gpio/libgpio.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003620
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003621 CONFIG_SPL_MMC_SUPPORT
3622 Support for drivers/mmc/libmmc.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003623
Tom Rini95579792012-02-14 07:29:40 +00003624 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
3625 CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
Paul Kocialkowskie2ccdf82014-11-08 23:14:55 +01003626 Address and partition on the MMC to load U-Boot from
Tom Rini95579792012-02-14 07:29:40 +00003627 when the MMC is being used in raw mode.
3628
Paul Kocialkowskib97300b2014-11-08 23:14:56 +01003629 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
3630 Partition on the MMC to load U-Boot from when the MMC is being
3631 used in raw mode
3632
Peter Korsgaard2b75b0a2013-05-13 08:36:29 +00003633 CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
3634 Sector to load kernel uImage from when MMC is being
3635 used in raw mode (for Falcon mode)
3636
3637 CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
3638 CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
3639 Sector and number of sectors to load kernel argument
3640 parameters from when MMC is being used in raw mode
3641 (for falcon mode)
3642
Paul Kocialkowskie2ccdf82014-11-08 23:14:55 +01003643 CONFIG_SYS_MMCSD_FS_BOOT_PARTITION
3644 Partition on the MMC to load U-Boot from when the MMC is being
3645 used in fs mode
3646
Tom Rini95579792012-02-14 07:29:40 +00003647 CONFIG_SPL_FAT_SUPPORT
3648 Support for fs/fat/libfat.o in SPL binary
3649
Guillaume GARDETfae81c72014-10-15 17:53:13 +02003650 CONFIG_SPL_EXT_SUPPORT
3651 Support for EXT filesystem in SPL binary
Tom Rini95579792012-02-14 07:29:40 +00003652
Guillaume GARDETfae81c72014-10-15 17:53:13 +02003653 CONFIG_SPL_FS_LOAD_PAYLOAD_NAME
3654 Filename to read to load U-Boot when reading from filesystem
3655
3656 CONFIG_SPL_FS_LOAD_KERNEL_NAME
Peter Korsgaard7ad2cc72013-05-13 08:36:27 +00003657 Filename to read to load kernel uImage when reading
Guillaume GARDETfae81c72014-10-15 17:53:13 +02003658 from filesystem (for Falcon mode)
Peter Korsgaard7ad2cc72013-05-13 08:36:27 +00003659
Guillaume GARDETfae81c72014-10-15 17:53:13 +02003660 CONFIG_SPL_FS_LOAD_ARGS_NAME
Peter Korsgaard7ad2cc72013-05-13 08:36:27 +00003661 Filename to read to load kernel argument parameters
Guillaume GARDETfae81c72014-10-15 17:53:13 +02003662 when reading from filesystem (for Falcon mode)
Peter Korsgaard7ad2cc72013-05-13 08:36:27 +00003663
Scott Wood06f60ae2012-12-06 13:33:17 +00003664 CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
3665 Set this for NAND SPL on PPC mpc83xx targets, so that
3666 start.S waits for the rest of the SPL to load before
3667 continuing (the hardware starts execution after just
3668 loading the first page rather than the full 4K).
3669
Prabhakar Kushwaha651fcf62014-04-08 19:12:31 +05303670 CONFIG_SPL_SKIP_RELOCATE
3671 Avoid SPL relocation
3672
Scott Wood6f2f01b2012-09-20 19:09:07 -05003673 CONFIG_SPL_NAND_BASE
3674 Include nand_base.c in the SPL. Requires
3675 CONFIG_SPL_NAND_DRIVERS.
3676
3677 CONFIG_SPL_NAND_DRIVERS
3678 SPL uses normal NAND drivers, not minimal drivers.
3679
3680 CONFIG_SPL_NAND_ECC
3681 Include standard software ECC in the SPL
3682
Tom Rini95579792012-02-14 07:29:40 +00003683 CONFIG_SPL_NAND_SIMPLE
Scott Wood7d4b7952012-09-21 18:35:27 -05003684 Support for NAND boot using simple NAND drivers that
3685 expose the cmd_ctrl() interface.
Tom Rini95579792012-02-14 07:29:40 +00003686
Tom Rini6dd3b562014-03-28 12:03:36 -04003687 CONFIG_SPL_MTD_SUPPORT
3688 Support for the MTD subsystem within SPL. Useful for
3689 environment on NAND support within SPL.
3690
Heiko Schocher0c3117b2014-10-31 08:31:00 +01003691 CONFIG_SPL_NAND_RAW_ONLY
3692 Support to boot only raw u-boot.bin images. Use this only
3693 if you need to save space.
3694
Ying Zhangbb0dc102013-08-16 15:16:11 +08003695 CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
3696 Set for the SPL on PPC mpc8xxx targets, support for
York Sun5614e712013-09-30 09:22:09 -07003697 drivers/ddr/fsl/libddr.o in SPL binary.
Ying Zhangbb0dc102013-08-16 15:16:11 +08003698
Ying Zhang7c8eea52013-08-16 15:16:12 +08003699 CONFIG_SPL_COMMON_INIT_DDR
3700 Set for common ddr init with serial presence detect in
3701 SPL binary.
3702
Tom Rini95579792012-02-14 07:29:40 +00003703 CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
3704 CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
3705 CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
3706 CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
3707 CONFIG_SYS_NAND_ECCBYTES
3708 Defines the size and behavior of the NAND that SPL uses
Scott Wood7d4b7952012-09-21 18:35:27 -05003709 to read U-Boot
Tom Rini95579792012-02-14 07:29:40 +00003710
Prabhakar Kushwahafbe76ae2013-12-11 12:42:11 +05303711 CONFIG_SPL_NAND_BOOT
3712 Add support NAND boot
3713
Tom Rini95579792012-02-14 07:29:40 +00003714 CONFIG_SYS_NAND_U_BOOT_OFFS
Scott Wood7d4b7952012-09-21 18:35:27 -05003715 Location in NAND to read U-Boot from
3716
3717 CONFIG_SYS_NAND_U_BOOT_DST
3718 Location in memory to load U-Boot to
3719
3720 CONFIG_SYS_NAND_U_BOOT_SIZE
3721 Size of image to load
Tom Rini95579792012-02-14 07:29:40 +00003722
3723 CONFIG_SYS_NAND_U_BOOT_START
Scott Wood7d4b7952012-09-21 18:35:27 -05003724 Entry point in loaded image to jump to
Tom Rini95579792012-02-14 07:29:40 +00003725
3726 CONFIG_SYS_NAND_HW_ECC_OOBFIRST
3727 Define this if you need to first read the OOB and then the
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08003728 data. This is used, for example, on davinci platforms.
Tom Rini95579792012-02-14 07:29:40 +00003729
3730 CONFIG_SPL_OMAP3_ID_NAND
3731 Support for an OMAP3-specific set of functions to return the
3732 ID and MFR of the first attached NAND chip, if present.
3733
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003734 CONFIG_SPL_SERIAL_SUPPORT
3735 Support for drivers/serial/libserial.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003736
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003737 CONFIG_SPL_SPI_FLASH_SUPPORT
3738 Support for drivers/mtd/spi/libspi_flash.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003739
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003740 CONFIG_SPL_SPI_SUPPORT
3741 Support for drivers/spi/libspi.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00003742
Pavel Machekc57b9532012-08-30 22:42:11 +02003743 CONFIG_SPL_RAM_DEVICE
3744 Support for running image already present in ram, in SPL binary
3745
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02003746 CONFIG_SPL_LIBGENERIC_SUPPORT
3747 Support for lib/libgeneric.o in SPL binary
Marian Balakowicz1372cce2008-03-12 10:33:01 +01003748
Ying Zhangba1bee42013-05-20 14:07:25 +08003749 CONFIG_SPL_ENV_SUPPORT
3750 Support for the environment operating in SPL binary
3751
3752 CONFIG_SPL_NET_SUPPORT
3753 Support for the net/libnet.o in SPL binary.
3754 It conflicts with SPL env from storage medium specified by
3755 CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
3756
Scott Wood74752ba2012-12-06 13:33:16 +00003757 CONFIG_SPL_PAD_TO
Benoît Thébaudeau6113d3f2013-04-11 09:35:49 +00003758 Image offset to which the SPL should be padded before appending
3759 the SPL payload. By default, this is defined as
3760 CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
3761 CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
3762 payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
Scott Wood74752ba2012-12-06 13:33:16 +00003763
Scott Woodca2fca22012-09-21 16:27:32 -05003764 CONFIG_SPL_TARGET
3765 Final target image containing SPL and payload. Some SPLs
3766 use an arch-specific makefile fragment instead, for
3767 example if more than one image needs to be produced.
3768
Simon Glass87ebee32013-05-08 08:05:59 +00003769 CONFIG_FIT_SPL_PRINT
3770 Printing information about a FIT image adds quite a bit of
3771 code to SPL. So this is normally disabled in SPL. Use this
3772 option to re-enable it. This will affect the output of the
3773 bootm command when booting a FIT image.
3774
Ying Zhang3aa29de2013-08-16 15:16:15 +08003775- TPL framework
3776 CONFIG_TPL
3777 Enable building of TPL globally.
3778
3779 CONFIG_TPL_PAD_TO
3780 Image offset to which the TPL should be padded before appending
3781 the TPL payload. By default, this is defined as
Wolfgang Denk93e14592013-10-04 17:43:24 +02003782 CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
3783 CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
3784 payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
Ying Zhang3aa29de2013-08-16 15:16:15 +08003785
wdenkc6097192002-11-03 00:24:07 +00003786Modem Support:
3787--------------
3788
Wolfgang Denk566e5cf2011-05-01 20:44:23 +02003789[so far only for SMDK2400 boards]
wdenkc6097192002-11-03 00:24:07 +00003790
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003791- Modem support enable:
wdenkc6097192002-11-03 00:24:07 +00003792 CONFIG_MODEM_SUPPORT
3793
3794- RTS/CTS Flow control enable:
3795 CONFIG_HWFLOW
3796
3797- Modem debug support:
3798 CONFIG_MODEM_SUPPORT_DEBUG
3799
wdenk43d96162003-03-06 00:02:04 +00003800 Enables debugging stuff (char screen[1024], dbg())
3801 for modem support. Useful only with BDI2000.
wdenkc6097192002-11-03 00:24:07 +00003802
wdenka8c7c702003-12-06 19:49:23 +00003803- Interrupt support (PPC):
3804
wdenkd4ca31c2004-01-02 14:00:00 +00003805 There are common interrupt_init() and timer_interrupt()
3806 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003807 for CPU specific initialization. interrupt_init_cpu()
wdenkd4ca31c2004-01-02 14:00:00 +00003808 should set decrementer_count to appropriate value. If
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003809 CPU resets decrementer automatically after interrupt
wdenkd4ca31c2004-01-02 14:00:00 +00003810 (ppc4xx) it should set decrementer_count to zero.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003811 timer_interrupt() calls timer_interrupt_cpu() for CPU
wdenkd4ca31c2004-01-02 14:00:00 +00003812 specific handling. If board has watchdog / status_led
3813 / other_activity_monitor it works automatically from
3814 general timer_interrupt().
wdenka8c7c702003-12-06 19:49:23 +00003815
wdenkc6097192002-11-03 00:24:07 +00003816- General:
3817
wdenk43d96162003-03-06 00:02:04 +00003818 In the target system modem support is enabled when a
3819 specific key (key combination) is pressed during
3820 power-on. Otherwise U-Boot will boot normally
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003821 (autoboot). The key_pressed() function is called from
wdenk43d96162003-03-06 00:02:04 +00003822 board_init(). Currently key_pressed() is a dummy
3823 function, returning 1 and thus enabling modem
3824 initialization.
wdenkc6097192002-11-03 00:24:07 +00003825
wdenk43d96162003-03-06 00:02:04 +00003826 If there are no modem init strings in the
3827 environment, U-Boot proceed to autoboot; the
3828 previous output (banner, info printfs) will be
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003829 suppressed, though.
wdenkc6097192002-11-03 00:24:07 +00003830
3831 See also: doc/README.Modem
3832
Helmut Raiger9660e442011-10-20 04:19:47 +00003833Board initialization settings:
3834------------------------------
3835
3836During Initialization u-boot calls a number of board specific functions
3837to allow the preparation of board specific prerequisites, e.g. pin setup
3838before drivers are initialized. To enable these callbacks the
3839following configuration macros have to be defined. Currently this is
3840architecture specific, so please check arch/your_architecture/lib/board.c
3841typically in board_init_f() and board_init_r().
3842
3843- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
3844- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
3845- CONFIG_BOARD_LATE_INIT: Call board_late_init()
3846- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
wdenkc6097192002-11-03 00:24:07 +00003847
wdenkc6097192002-11-03 00:24:07 +00003848Configuration Settings:
3849-----------------------
3850
York Sun4d1fd7f2014-02-26 17:03:19 -08003851- CONFIG_SYS_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit.
3852 Optionally it can be defined to support 64-bit memory commands.
3853
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003854- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
wdenkc6097192002-11-03 00:24:07 +00003855 undefine this when you're short of memory.
3856
Peter Tyser2fb26042009-01-27 18:03:12 -06003857- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
3858 width of the commands listed in the 'help' command output.
3859
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003860- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
wdenkc6097192002-11-03 00:24:07 +00003861 prompt for user input.
3862
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003863- CONFIG_SYS_CBSIZE: Buffer size for input from the Console
wdenkc6097192002-11-03 00:24:07 +00003864
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003865- CONFIG_SYS_PBSIZE: Buffer size for Console output
wdenkc6097192002-11-03 00:24:07 +00003866
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003867- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
wdenkc6097192002-11-03 00:24:07 +00003868
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003869- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
wdenkc6097192002-11-03 00:24:07 +00003870 the application (usually a Linux kernel) when it is
3871 booted
3872
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003873- CONFIG_SYS_BAUDRATE_TABLE:
wdenkc6097192002-11-03 00:24:07 +00003874 List of legal baudrate settings for this board.
3875
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003876- CONFIG_SYS_CONSOLE_INFO_QUIET
wdenk8bde7f72003-06-27 21:31:46 +00003877 Suppress display of console information at boot.
wdenkc6097192002-11-03 00:24:07 +00003878
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003879- CONFIG_SYS_CONSOLE_IS_IN_ENV
wdenk8bde7f72003-06-27 21:31:46 +00003880 If the board specific function
3881 extern int overwrite_console (void);
3882 returns 1, the stdin, stderr and stdout are switched to the
wdenkc6097192002-11-03 00:24:07 +00003883 serial port, else the settings in the environment are used.
3884
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003885- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
wdenk8bde7f72003-06-27 21:31:46 +00003886 Enable the call to overwrite_console().
wdenkc6097192002-11-03 00:24:07 +00003887
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003888- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
wdenkc6097192002-11-03 00:24:07 +00003889 Enable overwrite of previous console environment settings.
3890
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003891- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
wdenkc6097192002-11-03 00:24:07 +00003892 Begin and End addresses of the area used by the
3893 simple memory test.
3894
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003895- CONFIG_SYS_ALT_MEMTEST:
wdenk8bde7f72003-06-27 21:31:46 +00003896 Enable an alternate, more extensive memory test.
wdenkc6097192002-11-03 00:24:07 +00003897
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003898- CONFIG_SYS_MEMTEST_SCRATCH:
wdenk5f535fe2003-09-18 09:21:33 +00003899 Scratch address used by the alternate memory test
3900 You only need to set this if address zero isn't writeable
3901
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003902- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
3903 If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
Stefan Roese14f73ca2008-03-26 10:14:11 +01003904 this specified memory area will get subtracted from the top
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003905 (end) of RAM and won't get "touched" at all by U-Boot. By
Stefan Roese14f73ca2008-03-26 10:14:11 +01003906 fixing up gd->ram_size the Linux kernel should gets passed
3907 the now "corrected" memory size and won't touch it either.
3908 This should work for arch/ppc and arch/powerpc. Only Linux
Stefan Roese5e12e752008-03-28 11:02:53 +01003909 board ports in arch/powerpc with bootwrapper support that
Stefan Roese14f73ca2008-03-26 10:14:11 +01003910 recalculate the memory size from the SDRAM controller setup
Stefan Roese5e12e752008-03-28 11:02:53 +01003911 will have to get fixed in Linux additionally.
Stefan Roese14f73ca2008-03-26 10:14:11 +01003912
3913 This option can be used as a workaround for the 440EPx/GRx
3914 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
3915 be touched.
3916
3917 WARNING: Please make sure that this value is a multiple of
3918 the Linux page size (normally 4k). If this is not the case,
3919 then the end address of the Linux memory will be located at a
3920 non page size aligned address and this could cause major
3921 problems.
3922
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003923- CONFIG_SYS_LOADS_BAUD_CHANGE:
wdenkc6097192002-11-03 00:24:07 +00003924 Enable temporary baudrate change while serial download
3925
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003926- CONFIG_SYS_SDRAM_BASE:
wdenkc6097192002-11-03 00:24:07 +00003927 Physical start address of SDRAM. _Must_ be 0 here.
3928
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003929- CONFIG_SYS_MBIO_BASE:
wdenkc6097192002-11-03 00:24:07 +00003930 Physical start address of Motherboard I/O (if using a
3931 Cogent motherboard)
3932
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003933- CONFIG_SYS_FLASH_BASE:
wdenkc6097192002-11-03 00:24:07 +00003934 Physical start address of Flash memory.
3935
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003936- CONFIG_SYS_MONITOR_BASE:
wdenkc6097192002-11-03 00:24:07 +00003937 Physical start address of boot monitor code (set by
3938 make config files to be same as the text base address
Wolfgang Denk14d0a022010-10-07 21:51:12 +02003939 (CONFIG_SYS_TEXT_BASE) used when linking) - same as
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003940 CONFIG_SYS_FLASH_BASE when booting from flash.
wdenkc6097192002-11-03 00:24:07 +00003941
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003942- CONFIG_SYS_MONITOR_LEN:
wdenk8bde7f72003-06-27 21:31:46 +00003943 Size of memory reserved for monitor code, used to
3944 determine _at_compile_time_ (!) if the environment is
3945 embedded within the U-Boot image, or in a separate
3946 flash sector.
wdenkc6097192002-11-03 00:24:07 +00003947
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003948- CONFIG_SYS_MALLOC_LEN:
wdenkc6097192002-11-03 00:24:07 +00003949 Size of DRAM reserved for malloc() use.
3950
Simon Glassd59476b2014-07-10 22:23:28 -06003951- CONFIG_SYS_MALLOC_F_LEN
3952 Size of the malloc() pool for use before relocation. If
3953 this is defined, then a very simple malloc() implementation
3954 will become available before relocation. The address is just
3955 below the global data, and the stack is moved down to make
3956 space.
3957
3958 This feature allocates regions with increasing addresses
3959 within the region. calloc() is supported, but realloc()
3960 is not available. free() is supported but does nothing.
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08003961 The memory will be freed (or in fact just forgotten) when
Simon Glassd59476b2014-07-10 22:23:28 -06003962 U-Boot relocates itself.
3963
Simon Glasse7b14e92014-09-15 06:33:18 -06003964 Pre-relocation malloc() is only supported on ARM and sandbox
Simon Glass29afe9e2014-07-10 22:23:31 -06003965 at present but is fairly easy to enable for other archs.
3966
Simon Glass38687ae2014-11-10 17:16:54 -07003967- CONFIG_SYS_MALLOC_SIMPLE
3968 Provides a simple and small malloc() and calloc() for those
3969 boards which do not use the full malloc in SPL (which is
3970 enabled with CONFIG_SYS_SPL_MALLOC_START).
3971
Thierry Reding1dfdd9b2014-12-09 22:25:22 -07003972- CONFIG_SYS_NONCACHED_MEMORY:
3973 Size of non-cached memory area. This area of memory will be
3974 typically located right below the malloc() area and mapped
3975 uncached in the MMU. This is useful for drivers that would
3976 otherwise require a lot of explicit cache maintenance. For
3977 some drivers it's also impossible to properly maintain the
3978 cache. For example if the regions that need to be flushed
3979 are not a multiple of the cache-line size, *and* padding
3980 cannot be allocated between the regions to align them (i.e.
3981 if the HW requires a contiguous array of regions, and the
3982 size of each region is not cache-aligned), then a flush of
3983 one region may result in overwriting data that hardware has
3984 written to another region in the same cache-line. This can
3985 happen for example in network drivers where descriptors for
3986 buffers are typically smaller than the CPU cache-line (e.g.
3987 16 bytes vs. 32 or 64 bytes).
3988
3989 Non-cached memory is only supported on 32-bit ARM at present.
3990
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003991- CONFIG_SYS_BOOTM_LEN:
Stefan Roese15940c92006-03-13 11:16:36 +01003992 Normally compressed uImages are limited to an
3993 uncompressed size of 8 MBytes. If this is not enough,
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003994 you can define CONFIG_SYS_BOOTM_LEN in your board config file
Stefan Roese15940c92006-03-13 11:16:36 +01003995 to adjust this setting to your needs.
3996
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003997- CONFIG_SYS_BOOTMAPSZ:
wdenkc6097192002-11-03 00:24:07 +00003998 Maximum size of memory mapped by the startup code of
3999 the Linux kernel; all data that must be processed by
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02004000 the Linux kernel (bd_info, boot arguments, FDT blob if
4001 used) must be put below this limit, unless "bootm_low"
Robert P. J. Day1bce2ae2013-09-16 07:15:45 -04004002 environment variable is defined and non-zero. In such case
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02004003 all data for the Linux kernel must be between "bootm_low"
Wolfgang Denkc0f40852011-10-26 10:21:21 +00004004 and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
Grant Likelyc3624e62011-03-28 09:58:43 +00004005 variable "bootm_mapsize" will override the value of
4006 CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
4007 then the value in "bootm_size" will be used instead.
wdenkc6097192002-11-03 00:24:07 +00004008
John Rigbyfca43cc2010-10-13 13:57:35 -06004009- CONFIG_SYS_BOOT_RAMDISK_HIGH:
4010 Enable initrd_high functionality. If defined then the
4011 initrd_high feature is enabled and the bootm ramdisk subcommand
4012 is enabled.
4013
4014- CONFIG_SYS_BOOT_GET_CMDLINE:
4015 Enables allocating and saving kernel cmdline in space between
4016 "bootm_low" and "bootm_low" + BOOTMAPSZ.
4017
4018- CONFIG_SYS_BOOT_GET_KBD:
4019 Enables allocating and saving a kernel copy of the bd_info in
4020 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
4021
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004022- CONFIG_SYS_MAX_FLASH_BANKS:
wdenkc6097192002-11-03 00:24:07 +00004023 Max number of Flash memory banks
4024
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004025- CONFIG_SYS_MAX_FLASH_SECT:
wdenkc6097192002-11-03 00:24:07 +00004026 Max number of sectors on a Flash chip
4027
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004028- CONFIG_SYS_FLASH_ERASE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00004029 Timeout for Flash erase operations (in ms)
4030
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004031- CONFIG_SYS_FLASH_WRITE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00004032 Timeout for Flash write operations (in ms)
4033
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004034- CONFIG_SYS_FLASH_LOCK_TOUT
wdenk8564acf2003-07-14 22:13:32 +00004035 Timeout for Flash set sector lock bit operation (in ms)
4036
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004037- CONFIG_SYS_FLASH_UNLOCK_TOUT
wdenk8564acf2003-07-14 22:13:32 +00004038 Timeout for Flash clear lock bits operation (in ms)
4039
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004040- CONFIG_SYS_FLASH_PROTECTION
wdenk8564acf2003-07-14 22:13:32 +00004041 If defined, hardware flash sectors protection is used
4042 instead of U-Boot software protection.
4043
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004044- CONFIG_SYS_DIRECT_FLASH_TFTP:
wdenkc6097192002-11-03 00:24:07 +00004045
4046 Enable TFTP transfers directly to flash memory;
4047 without this option such a download has to be
4048 performed in two steps: (1) download to RAM, and (2)
4049 copy from RAM to flash.
4050
4051 The two-step approach is usually more reliable, since
4052 you can check if the download worked before you erase
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004053 the flash, but in some situations (when system RAM is
4054 too limited to allow for a temporary copy of the
wdenkc6097192002-11-03 00:24:07 +00004055 downloaded image) this option may be very useful.
4056
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004057- CONFIG_SYS_FLASH_CFI:
wdenk43d96162003-03-06 00:02:04 +00004058 Define if the flash driver uses extra elements in the
wdenk5653fc32004-02-08 22:55:38 +00004059 common flash structure for storing flash geometry.
4060
Jean-Christophe PLAGNIOL-VILLARD00b18832008-08-13 01:40:42 +02004061- CONFIG_FLASH_CFI_DRIVER
wdenk5653fc32004-02-08 22:55:38 +00004062 This option also enables the building of the cfi_flash driver
4063 in the drivers directory
wdenkc6097192002-11-03 00:24:07 +00004064
Piotr Ziecik91809ed2008-11-17 15:57:58 +01004065- CONFIG_FLASH_CFI_MTD
4066 This option enables the building of the cfi_mtd driver
4067 in the drivers directory. The driver exports CFI flash
4068 to the MTD layer.
4069
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004070- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
Guennadi Liakhovetski96ef8312008-04-03 13:36:02 +02004071 Use buffered writes to flash.
4072
4073- CONFIG_FLASH_SPANSION_S29WS_N
4074 s29ws-n MirrorBit flash has non-standard addresses for buffered
4075 write commands.
4076
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004077- CONFIG_SYS_FLASH_QUIET_TEST
Stefan Roese5568e612005-11-22 13:20:42 +01004078 If this option is defined, the common CFI flash doesn't
4079 print it's warning upon not recognized FLASH banks. This
4080 is useful, if some of the configured banks are only
4081 optionally available.
4082
Jerry Van Baren9a042e92008-03-08 13:48:01 -05004083- CONFIG_FLASH_SHOW_PROGRESS
4084 If defined (must be an integer), print out countdown
4085 digits and dots. Recommended value: 45 (9..1) for 80
4086 column displays, 15 (3..1) for 40 column displays.
4087
Stefan Roese352ef3f2013-04-04 15:53:14 +02004088- CONFIG_FLASH_VERIFY
4089 If defined, the content of the flash (destination) is compared
4090 against the source after the write operation. An error message
4091 will be printed when the contents are not identical.
4092 Please note that this option is useless in nearly all cases,
4093 since such flash programming errors usually are detected earlier
4094 while unprotecting/erasing/programming. Please only enable
4095 this option if you really know what you are doing.
4096
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004097- CONFIG_SYS_RX_ETH_BUFFER:
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004098 Defines the number of Ethernet receive buffers. On some
4099 Ethernet controllers it is recommended to set this value
stroese53cf9432003-06-05 15:39:44 +00004100 to 8 or even higher (EEPRO100 or 405 EMAC), since all
4101 buffers can be full shortly after enabling the interface
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004102 on high Ethernet traffic.
stroese53cf9432003-06-05 15:39:44 +00004103 Defaults to 4 if not defined.
4104
Wolfgang Denkea882ba2010-06-20 23:33:59 +02004105- CONFIG_ENV_MAX_ENTRIES
4106
Wolfgang Denk071bc922010-10-27 22:48:30 +02004107 Maximum number of entries in the hash table that is used
4108 internally to store the environment settings. The default
4109 setting is supposed to be generous and should work in most
4110 cases. This setting can be used to tune behaviour; see
4111 lib/hashtable.c for details.
Wolfgang Denkea882ba2010-06-20 23:33:59 +02004112
Joe Hershberger25980902012-12-11 22:16:31 -06004113- CONFIG_ENV_FLAGS_LIST_DEFAULT
4114- CONFIG_ENV_FLAGS_LIST_STATIC
Robert P. J. Day1bce2ae2013-09-16 07:15:45 -04004115 Enable validation of the values given to environment variables when
Joe Hershberger25980902012-12-11 22:16:31 -06004116 calling env set. Variables can be restricted to only decimal,
4117 hexadecimal, or boolean. If CONFIG_CMD_NET is also defined,
4118 the variables can also be restricted to IP address or MAC address.
4119
4120 The format of the list is:
4121 type_attribute = [s|d|x|b|i|m]
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004122 access_attribute = [a|r|o|c]
4123 attributes = type_attribute[access_attribute]
Joe Hershberger25980902012-12-11 22:16:31 -06004124 entry = variable_name[:attributes]
4125 list = entry[,list]
4126
4127 The type attributes are:
4128 s - String (default)
4129 d - Decimal
4130 x - Hexadecimal
4131 b - Boolean ([1yYtT|0nNfF])
4132 i - IP address
4133 m - MAC address
4134
Joe Hershberger267541f2012-12-11 22:16:34 -06004135 The access attributes are:
4136 a - Any (default)
4137 r - Read-only
4138 o - Write-once
4139 c - Change-default
4140
Joe Hershberger25980902012-12-11 22:16:31 -06004141 - CONFIG_ENV_FLAGS_LIST_DEFAULT
4142 Define this to a list (string) to define the ".flags"
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004143 environment variable in the default or embedded environment.
Joe Hershberger25980902012-12-11 22:16:31 -06004144
4145 - CONFIG_ENV_FLAGS_LIST_STATIC
4146 Define this to a list (string) to define validation that
4147 should be done if an entry is not found in the ".flags"
4148 environment variable. To override a setting in the static
4149 list, simply add an entry for the same variable name to the
4150 ".flags" variable.
4151
Joe Hershbergerbdf1fe42015-05-20 14:27:20 -05004152 If CONFIG_REGEX is defined, the variable_name above is evaluated as a
4153 regular expression. This allows multiple variables to define the same
4154 flags without explicitly listing them for each variable.
4155
Joe Hershberger267541f2012-12-11 22:16:34 -06004156- CONFIG_ENV_ACCESS_IGNORE_FORCE
4157 If defined, don't allow the -f switch to env set override variable
4158 access flags.
4159
Simon Glass5c1a7ea2013-03-08 13:45:27 +00004160- CONFIG_SYS_GENERIC_BOARD
4161 This selects the architecture-generic board system instead of the
4162 architecture-specific board files. It is intended to move boards
4163 to this new framework over time. Defining this will disable the
4164 arch/foo/lib/board.c file and use common/board_f.c and
4165 common/board_r.c instead. To use this option your architecture
Masahiro Yamada0a12e682015-03-19 19:42:51 +09004166 must support it (i.e. must select HAVE_GENERIC_BOARD in arch/Kconfig).
4167 If you find problems enabling this option on your board please report
4168 the problem and send patches!
Simon Glass5c1a7ea2013-03-08 13:45:27 +00004169
Lokesh Vutla0b1b60c2013-04-17 20:49:40 +00004170- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
4171 This is set by OMAP boards for the max time that reset should
4172 be asserted. See doc/README.omap-reset-time for details on how
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004173 the value can be calculated on a given board.
Simon Glass632efa72013-03-11 07:06:48 +00004174
Gabe Black0d296cc2014-10-15 04:38:30 -06004175- CONFIG_USE_STDINT
4176 If stdint.h is available with your toolchain you can define this
4177 option to enable it. You can provide option 'USE_STDINT=1' when
4178 building U-Boot to enable this.
4179
wdenkc6097192002-11-03 00:24:07 +00004180The following definitions that deal with the placement and management
4181of environment data (variable area); in general, we support the
4182following configurations:
4183
Mike Frysingerc3eb3fe2011-07-08 10:44:25 +00004184- CONFIG_BUILD_ENVCRC:
4185
4186 Builds up envcrc with the target environment so that external utils
4187 may easily extract it and embed it in final U-Boot images.
4188
Jean-Christophe PLAGNIOL-VILLARD5a1aceb2008-09-10 22:48:04 +02004189- CONFIG_ENV_IS_IN_FLASH:
wdenkc6097192002-11-03 00:24:07 +00004190
4191 Define this if the environment is in flash memory.
4192
4193 a) The environment occupies one whole flash sector, which is
4194 "embedded" in the text segment with the U-Boot code. This
4195 happens usually with "bottom boot sector" or "top boot
4196 sector" type flash chips, which have several smaller
4197 sectors at the start or the end. For instance, such a
4198 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
4199 such a case you would place the environment in one of the
4200 4 kB sectors - with U-Boot code before and after it. With
4201 "top boot sector" type flash chips, you would put the
4202 environment in one of the last sectors, leaving a gap
4203 between U-Boot and the environment.
4204
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004205 - CONFIG_ENV_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00004206
4207 Offset of environment data (variable area) to the
4208 beginning of flash memory; for instance, with bottom boot
4209 type flash chips the second sector can be used: the offset
4210 for this sector is given here.
4211
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004212 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
wdenkc6097192002-11-03 00:24:07 +00004213
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004214 - CONFIG_ENV_ADDR:
wdenkc6097192002-11-03 00:24:07 +00004215
4216 This is just another way to specify the start address of
4217 the flash sector containing the environment (instead of
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004218 CONFIG_ENV_OFFSET).
wdenkc6097192002-11-03 00:24:07 +00004219
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004220 - CONFIG_ENV_SECT_SIZE:
wdenkc6097192002-11-03 00:24:07 +00004221
4222 Size of the sector containing the environment.
4223
4224
4225 b) Sometimes flash chips have few, equal sized, BIG sectors.
4226 In such a case you don't want to spend a whole sector for
4227 the environment.
4228
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004229 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00004230
Jean-Christophe PLAGNIOL-VILLARD5a1aceb2008-09-10 22:48:04 +02004231 If you use this in combination with CONFIG_ENV_IS_IN_FLASH
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004232 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
wdenkc6097192002-11-03 00:24:07 +00004233 of this flash sector for the environment. This saves
4234 memory for the RAM copy of the environment.
4235
4236 It may also save flash memory if you decide to use this
4237 when your environment is "embedded" within U-Boot code,
4238 since then the remainder of the flash sector could be used
4239 for U-Boot code. It should be pointed out that this is
4240 STRONGLY DISCOURAGED from a robustness point of view:
4241 updating the environment in flash makes it always
4242 necessary to erase the WHOLE sector. If something goes
4243 wrong before the contents has been restored from a copy in
4244 RAM, your target system will be dead.
4245
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004246 - CONFIG_ENV_ADDR_REDUND
4247 CONFIG_ENV_SIZE_REDUND
wdenkc6097192002-11-03 00:24:07 +00004248
wdenk43d96162003-03-06 00:02:04 +00004249 These settings describe a second storage area used to hold
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004250 a redundant copy of the environment data, so that there is
wdenk3e386912003-04-05 00:53:31 +00004251 a valid backup copy in case there is a power failure during
wdenk43d96162003-03-06 00:02:04 +00004252 a "saveenv" operation.
wdenkc6097192002-11-03 00:24:07 +00004253
4254BE CAREFUL! Any changes to the flash layout, and some changes to the
4255source code will make it necessary to adapt <board>/u-boot.lds*
4256accordingly!
4257
4258
Jean-Christophe PLAGNIOL-VILLARD9314cee2008-09-10 22:47:59 +02004259- CONFIG_ENV_IS_IN_NVRAM:
wdenkc6097192002-11-03 00:24:07 +00004260
4261 Define this if you have some non-volatile memory device
4262 (NVRAM, battery buffered SRAM) which you want to use for the
4263 environment.
4264
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004265 - CONFIG_ENV_ADDR:
4266 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00004267
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004268 These two #defines are used to determine the memory area you
wdenkc6097192002-11-03 00:24:07 +00004269 want to use for environment. It is assumed that this memory
4270 can just be read and written to, without any special
4271 provision.
4272
4273BE CAREFUL! The first access to the environment happens quite early
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004274in U-Boot initialization (when we try to get the setting of for the
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004275console baudrate). You *MUST* have mapped your NVRAM area then, or
wdenkc6097192002-11-03 00:24:07 +00004276U-Boot will hang.
4277
4278Please note that even with NVRAM we still use a copy of the
4279environment in RAM: we could work on NVRAM directly, but we want to
4280keep settings there always unmodified except somebody uses "saveenv"
4281to save the current settings.
4282
4283
Jean-Christophe PLAGNIOL-VILLARDbb1f8b42008-09-05 09:19:30 +02004284- CONFIG_ENV_IS_IN_EEPROM:
wdenkc6097192002-11-03 00:24:07 +00004285
4286 Use this if you have an EEPROM or similar serial access
4287 device and a driver for it.
4288
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004289 - CONFIG_ENV_OFFSET:
4290 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00004291
4292 These two #defines specify the offset and size of the
4293 environment area within the total memory of your EEPROM.
4294
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004295 - CONFIG_SYS_I2C_EEPROM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00004296 If defined, specified the chip address of the EEPROM device.
4297 The default address is zero.
4298
Christian Gmeiner189d2572015-02-11 15:19:31 +01004299 - CONFIG_SYS_I2C_EEPROM_BUS:
4300 If defined, specified the i2c bus of the EEPROM device.
4301
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004302 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
wdenkc6097192002-11-03 00:24:07 +00004303 If defined, the number of bits used to address bytes in a
4304 single page in the EEPROM device. A 64 byte page, for example
4305 would require six bits.
4306
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004307 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
wdenkc6097192002-11-03 00:24:07 +00004308 If defined, the number of milliseconds to delay between
wdenkba56f622004-02-06 23:19:44 +00004309 page writes. The default is zero milliseconds.
wdenkc6097192002-11-03 00:24:07 +00004310
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004311 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
wdenkc6097192002-11-03 00:24:07 +00004312 The length in bytes of the EEPROM memory array address. Note
4313 that this is NOT the chip address length!
4314
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004315 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
wdenk5cf91d62004-04-23 20:32:05 +00004316 EEPROM chips that implement "address overflow" are ones
4317 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
4318 address and the extra bits end up in the "chip address" bit
4319 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
4320 byte chips.
4321
4322 Note that we consider the length of the address field to
4323 still be one byte because the extra address bits are hidden
4324 in the chip address.
4325
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004326 - CONFIG_SYS_EEPROM_SIZE:
wdenkc6097192002-11-03 00:24:07 +00004327 The size in bytes of the EEPROM device.
4328
Heiko Schocher548738b2010-01-07 08:55:40 +01004329 - CONFIG_ENV_EEPROM_IS_ON_I2C
4330 define this, if you have I2C and SPI activated, and your
4331 EEPROM, which holds the environment, is on the I2C bus.
4332
4333 - CONFIG_I2C_ENV_EEPROM_BUS
4334 if you have an Environment on an EEPROM reached over
4335 I2C muxes, you can define here, how to reach this
4336 EEPROM. For example:
4337
Heiko Schocherea818db2013-01-29 08:53:15 +01004338 #define CONFIG_I2C_ENV_EEPROM_BUS 1
Heiko Schocher548738b2010-01-07 08:55:40 +01004339
4340 EEPROM which holds the environment, is reached over
4341 a pca9547 i2c mux with address 0x70, channel 3.
wdenkc6097192002-11-03 00:24:07 +00004342
Jean-Christophe PLAGNIOL-VILLARD057c8492008-09-10 22:47:58 +02004343- CONFIG_ENV_IS_IN_DATAFLASH:
wdenk5779d8d2003-12-06 23:55:10 +00004344
wdenkd4ca31c2004-01-02 14:00:00 +00004345 Define this if you have a DataFlash memory device which you
wdenk5779d8d2003-12-06 23:55:10 +00004346 want to use for the environment.
4347
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004348 - CONFIG_ENV_OFFSET:
4349 - CONFIG_ENV_ADDR:
4350 - CONFIG_ENV_SIZE:
wdenk5779d8d2003-12-06 23:55:10 +00004351
4352 These three #defines specify the offset and size of the
4353 environment area within the total memory of your DataFlash placed
4354 at the specified address.
4355
Wu, Joshbd83b592014-07-01 19:30:13 +08004356- CONFIG_ENV_IS_IN_SPI_FLASH:
4357
4358 Define this if you have a SPI Flash memory device which you
4359 want to use for the environment.
4360
4361 - CONFIG_ENV_OFFSET:
4362 - CONFIG_ENV_SIZE:
4363
4364 These two #defines specify the offset and size of the
4365 environment area within the SPI Flash. CONFIG_ENV_OFFSET must be
4366 aligned to an erase sector boundary.
4367
4368 - CONFIG_ENV_SECT_SIZE:
4369
4370 Define the SPI flash's sector size.
4371
4372 - CONFIG_ENV_OFFSET_REDUND (optional):
4373
4374 This setting describes a second storage area of CONFIG_ENV_SIZE
4375 size used to hold a redundant copy of the environment data, so
4376 that there is a valid backup copy in case there is a power failure
4377 during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
4378 aligned to an erase sector boundary.
4379
4380 - CONFIG_ENV_SPI_BUS (optional):
4381 - CONFIG_ENV_SPI_CS (optional):
4382
4383 Define the SPI bus and chip select. If not defined they will be 0.
4384
4385 - CONFIG_ENV_SPI_MAX_HZ (optional):
4386
4387 Define the SPI max work clock. If not defined then use 1MHz.
4388
4389 - CONFIG_ENV_SPI_MODE (optional):
4390
4391 Define the SPI work mode. If not defined then use SPI_MODE_3.
4392
Liu Gang0a85a9e2012-03-08 00:33:20 +00004393- CONFIG_ENV_IS_IN_REMOTE:
4394
4395 Define this if you have a remote memory space which you
4396 want to use for the local device's environment.
4397
4398 - CONFIG_ENV_ADDR:
4399 - CONFIG_ENV_SIZE:
4400
4401 These two #defines specify the address and size of the
4402 environment area within the remote memory space. The
4403 local device can get the environment from remote memory
Liu Gangfc54c7f2012-08-09 05:10:01 +00004404 space by SRIO or PCIE links.
Liu Gang0a85a9e2012-03-08 00:33:20 +00004405
4406BE CAREFUL! For some special cases, the local device can not use
4407"saveenv" command. For example, the local device will get the
Liu Gangfc54c7f2012-08-09 05:10:01 +00004408environment stored in a remote NOR flash by SRIO or PCIE link,
4409but it can not erase, write this NOR flash by SRIO or PCIE interface.
Liu Gang0a85a9e2012-03-08 00:33:20 +00004410
Jean-Christophe PLAGNIOL-VILLARD51bfee12008-09-10 22:47:58 +02004411- CONFIG_ENV_IS_IN_NAND:
wdenk13a56952004-06-09 14:58:14 +00004412
4413 Define this if you have a NAND device which you want to use
4414 for the environment.
4415
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004416 - CONFIG_ENV_OFFSET:
4417 - CONFIG_ENV_SIZE:
wdenk13a56952004-06-09 14:58:14 +00004418
4419 These two #defines specify the offset and size of the environment
Scott Woodfdd813d2010-09-17 14:38:37 -05004420 area within the first NAND device. CONFIG_ENV_OFFSET must be
4421 aligned to an erase block boundary.
wdenk5779d8d2003-12-06 23:55:10 +00004422
Scott Woodfdd813d2010-09-17 14:38:37 -05004423 - CONFIG_ENV_OFFSET_REDUND (optional):
Markus Klotzbuechere443c942006-03-20 18:02:44 +01004424
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02004425 This setting describes a second storage area of CONFIG_ENV_SIZE
Scott Woodfdd813d2010-09-17 14:38:37 -05004426 size used to hold a redundant copy of the environment data, so
4427 that there is a valid backup copy in case there is a power failure
Wolfgang Denkc0f40852011-10-26 10:21:21 +00004428 during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
Scott Woodfdd813d2010-09-17 14:38:37 -05004429 aligned to an erase block boundary.
Markus Klotzbuechere443c942006-03-20 18:02:44 +01004430
Scott Woodfdd813d2010-09-17 14:38:37 -05004431 - CONFIG_ENV_RANGE (optional):
4432
4433 Specifies the length of the region in which the environment
4434 can be written. This should be a multiple of the NAND device's
4435 block size. Specifying a range with more erase blocks than
4436 are needed to hold CONFIG_ENV_SIZE allows bad blocks within
4437 the range to be avoided.
4438
4439 - CONFIG_ENV_OFFSET_OOB (optional):
4440
4441 Enables support for dynamically retrieving the offset of the
4442 environment from block zero's out-of-band data. The
4443 "nand env.oob" command can be used to record this offset.
4444 Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
4445 using CONFIG_ENV_OFFSET_OOB.
Markus Klotzbuechere443c942006-03-20 18:02:44 +01004446
Guennadi Liakhovetskib74ab732009-05-18 16:07:22 +02004447- CONFIG_NAND_ENV_DST
4448
4449 Defines address in RAM to which the nand_spl code should copy the
4450 environment. If redundant environment is used, it will be copied to
4451 CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
4452
Joe Hershberger2b744332013-04-08 10:32:51 +00004453- CONFIG_ENV_IS_IN_UBI:
4454
4455 Define this if you have an UBI volume that you want to use for the
4456 environment. This has the benefit of wear-leveling the environment
4457 accesses, which is important on NAND.
4458
4459 - CONFIG_ENV_UBI_PART:
4460
4461 Define this to a string that is the mtd partition containing the UBI.
4462
4463 - CONFIG_ENV_UBI_VOLUME:
4464
4465 Define this to the name of the volume that you want to store the
4466 environment in.
4467
Joe Hershberger785881f2013-04-08 10:32:52 +00004468 - CONFIG_ENV_UBI_VOLUME_REDUND:
4469
4470 Define this to the name of another volume to store a second copy of
4471 the environment in. This will enable redundant environments in UBI.
4472 It is assumed that both volumes are in the same MTD partition.
4473
Joe Hershberger2b744332013-04-08 10:32:51 +00004474 - CONFIG_UBI_SILENCE_MSG
4475 - CONFIG_UBIFS_SILENCE_MSG
4476
4477 You will probably want to define these to avoid a really noisy system
4478 when storing the env in UBI.
4479
Wu, Joshd1db76f2014-06-24 17:31:03 +08004480- CONFIG_ENV_IS_IN_FAT:
4481 Define this if you want to use the FAT file system for the environment.
4482
4483 - FAT_ENV_INTERFACE:
4484
4485 Define this to a string that is the name of the block device.
4486
4487 - FAT_ENV_DEV_AND_PART:
4488
4489 Define this to a string to specify the partition of the device. It can
4490 be as following:
4491
4492 "D:P", "D:0", "D", "D:" or "D:auto" (D, P are integers. And P >= 1)
4493 - "D:P": device D partition P. Error occurs if device D has no
4494 partition table.
4495 - "D:0": device D.
4496 - "D" or "D:": device D partition 1 if device D has partition
4497 table, or the whole device D if has no partition
4498 table.
4499 - "D:auto": first partition in device D with bootable flag set.
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004500 If none, first valid partition in device D. If no
Wu, Joshd1db76f2014-06-24 17:31:03 +08004501 partition table then means device D.
4502
4503 - FAT_ENV_FILE:
4504
4505 It's a string of the FAT file name. This file use to store the
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004506 environment.
Wu, Joshd1db76f2014-06-24 17:31:03 +08004507
4508 - CONFIG_FAT_WRITE:
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004509 This should be defined. Otherwise it cannot save the environment file.
Wu, Joshd1db76f2014-06-24 17:31:03 +08004510
Stephen Warren06e4ae52013-06-11 15:14:00 -06004511- CONFIG_ENV_IS_IN_MMC:
4512
4513 Define this if you have an MMC device which you want to use for the
4514 environment.
4515
4516 - CONFIG_SYS_MMC_ENV_DEV:
4517
4518 Specifies which MMC device the environment is stored in.
4519
4520 - CONFIG_SYS_MMC_ENV_PART (optional):
4521
4522 Specifies which MMC partition the environment is stored in. If not
4523 set, defaults to partition 0, the user area. Common values might be
4524 1 (first MMC boot partition), 2 (second MMC boot partition).
4525
4526 - CONFIG_ENV_OFFSET:
4527 - CONFIG_ENV_SIZE:
4528
4529 These two #defines specify the offset and size of the environment
4530 area within the specified MMC device.
4531
Stephen Warren5c088ee2013-06-11 15:14:02 -06004532 If offset is positive (the usual case), it is treated as relative to
4533 the start of the MMC partition. If offset is negative, it is treated
4534 as relative to the end of the MMC partition. This can be useful if
4535 your board may be fitted with different MMC devices, which have
4536 different sizes for the MMC partitions, and you always want the
4537 environment placed at the very end of the partition, to leave the
4538 maximum possible space before it, to store other data.
4539
Stephen Warren06e4ae52013-06-11 15:14:00 -06004540 These two values are in units of bytes, but must be aligned to an
4541 MMC sector boundary.
4542
4543 - CONFIG_ENV_OFFSET_REDUND (optional):
4544
4545 Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
4546 hold a redundant copy of the environment data. This provides a
4547 valid backup copy in case the other copy is corrupted, e.g. due
4548 to a power failure during a "saveenv" operation.
4549
Stephen Warren5c088ee2013-06-11 15:14:02 -06004550 This value may also be positive or negative; this is handled in the
4551 same way as CONFIG_ENV_OFFSET.
4552
Stephen Warren06e4ae52013-06-11 15:14:00 -06004553 This value is also in units of bytes, but must also be aligned to
4554 an MMC sector boundary.
4555
4556 - CONFIG_ENV_SIZE_REDUND (optional):
4557
4558 This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
4559 set. If this value is set, it must be set to the same value as
4560 CONFIG_ENV_SIZE.
4561
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004562- CONFIG_SYS_SPI_INIT_OFFSET
wdenkc6097192002-11-03 00:24:07 +00004563
4564 Defines offset to the initial SPI buffer area in DPRAM. The
4565 area is used at an early stage (ROM part) if the environment
4566 is configured to reside in the SPI EEPROM: We need a 520 byte
4567 scratch DPRAM area. It is used between the two initialization
4568 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
4569 to be a good choice since it makes it far enough from the
4570 start of the data area as well as from the stack pointer.
4571
Bruce Adlere881cb52007-11-02 13:15:42 -07004572Please note that the environment is read-only until the monitor
wdenkc6097192002-11-03 00:24:07 +00004573has been relocated to RAM and a RAM copy of the environment has been
Wolfgang Denkcdb74972010-07-24 21:55:43 +02004574created; also, when using EEPROM you will have to use getenv_f()
wdenkc6097192002-11-03 00:24:07 +00004575until then to read environment variables.
4576
wdenk85ec0bc2003-03-31 16:34:49 +00004577The environment is protected by a CRC32 checksum. Before the monitor
4578is relocated into RAM, as a result of a bad CRC you will be working
4579with the compiled-in default environment - *silently*!!! [This is
4580necessary, because the first environment variable we need is the
4581"baudrate" setting for the console - if we have a bad CRC, we don't
4582have any device yet where we could complain.]
wdenkc6097192002-11-03 00:24:07 +00004583
4584Note: once the monitor has been relocated, then it will complain if
4585the default environment is used; a new CRC is computed as soon as you
wdenk85ec0bc2003-03-31 16:34:49 +00004586use the "saveenv" command to store a valid environment.
wdenkc6097192002-11-03 00:24:07 +00004587
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004588- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
wdenk42d1f032003-10-15 23:53:47 +00004589 Echo the inverted Ethernet link state to the fault LED.
wdenkfc3e2162003-10-08 22:33:00 +00004590
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004591 Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
wdenkfc3e2162003-10-08 22:33:00 +00004592 also needs to be defined.
4593
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004594- CONFIG_SYS_FAULT_MII_ADDR:
wdenk42d1f032003-10-15 23:53:47 +00004595 MII address of the PHY to check for the Ethernet link state.
wdenkc6097192002-11-03 00:24:07 +00004596
Ron Madridf5675aa2009-02-18 14:30:44 -08004597- CONFIG_NS16550_MIN_FUNCTIONS:
4598 Define this if you desire to only have use of the NS16550_init
4599 and NS16550_putc functions for the serial driver located at
4600 drivers/serial/ns16550.c. This option is useful for saving
4601 space for already greatly restricted images, including but not
4602 limited to NAND_SPL configurations.
4603
Simon Glassb2b92f52012-11-30 13:01:18 +00004604- CONFIG_DISPLAY_BOARDINFO
4605 Display information about the board that U-Boot is running on
4606 when U-Boot starts up. The board function checkboard() is called
4607 to do this.
4608
Simon Glasse2e3e2b2012-11-30 13:01:19 +00004609- CONFIG_DISPLAY_BOARDINFO_LATE
4610 Similar to the previous option, but display this information
4611 later, once stdio is running and output goes to the LCD, if
4612 present.
4613
Sascha Silbefeb85802013-08-11 16:40:43 +02004614- CONFIG_BOARD_SIZE_LIMIT:
4615 Maximum size of the U-Boot image. When defined, the
4616 build system checks that the actual size does not
4617 exceed it.
4618
wdenkc6097192002-11-03 00:24:07 +00004619Low Level (hardware related) configuration options:
wdenkdc7c9a12003-03-26 06:55:25 +00004620---------------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00004621
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004622- CONFIG_SYS_CACHELINE_SIZE:
wdenkc6097192002-11-03 00:24:07 +00004623 Cache Line Size of the CPU.
4624
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004625- CONFIG_SYS_DEFAULT_IMMR:
wdenkc6097192002-11-03 00:24:07 +00004626 Default address of the IMMR after system reset.
wdenk2535d602003-07-17 23:16:40 +00004627
wdenk42d1f032003-10-15 23:53:47 +00004628 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
4629 and RPXsuper) to be able to adjust the position of
4630 the IMMR register after a reset.
wdenkc6097192002-11-03 00:24:07 +00004631
Timur Tabie46fedf2011-08-04 18:03:41 -05004632- CONFIG_SYS_CCSRBAR_DEFAULT:
4633 Default (power-on reset) physical address of CCSR on Freescale
4634 PowerPC SOCs.
4635
4636- CONFIG_SYS_CCSRBAR:
4637 Virtual address of CCSR. On a 32-bit build, this is typically
4638 the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
4639
4640 CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
4641 for cross-platform code that uses that macro instead.
4642
4643- CONFIG_SYS_CCSRBAR_PHYS:
4644 Physical address of CCSR. CCSR can be relocated to a new
4645 physical address, if desired. In this case, this macro should
Wolfgang Denkc0f40852011-10-26 10:21:21 +00004646 be set to that address. Otherwise, it should be set to the
Timur Tabie46fedf2011-08-04 18:03:41 -05004647 same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR
4648 is typically relocated on 36-bit builds. It is recommended
4649 that this macro be defined via the _HIGH and _LOW macros:
4650
4651 #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
4652 * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
4653
4654- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
Wolfgang Denk4cf26092011-10-07 09:58:21 +02004655 Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically
4656 either 0 (32-bit build) or 0xF (36-bit build). This macro is
Timur Tabie46fedf2011-08-04 18:03:41 -05004657 used in assembly code, so it must not contain typecasts or
4658 integer size suffixes (e.g. "ULL").
4659
4660- CONFIG_SYS_CCSRBAR_PHYS_LOW:
4661 Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is
4662 used in assembly code, so it must not contain typecasts or
4663 integer size suffixes (e.g. "ULL").
4664
4665- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
4666 If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
4667 forced to a value that ensures that CCSR is not relocated.
4668
wdenk7f6c2cb2002-11-10 22:06:23 +00004669- Floppy Disk Support:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004670 CONFIG_SYS_FDC_DRIVE_NUMBER
wdenk7f6c2cb2002-11-10 22:06:23 +00004671
4672 the default drive number (default value 0)
4673
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004674 CONFIG_SYS_ISA_IO_STRIDE
wdenk7f6c2cb2002-11-10 22:06:23 +00004675
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004676 defines the spacing between FDC chipset registers
wdenk7f6c2cb2002-11-10 22:06:23 +00004677 (default value 1)
4678
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004679 CONFIG_SYS_ISA_IO_OFFSET
wdenk7f6c2cb2002-11-10 22:06:23 +00004680
wdenk43d96162003-03-06 00:02:04 +00004681 defines the offset of register from address. It
4682 depends on which part of the data bus is connected to
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004683 the FDC chipset. (default value 0)
wdenk7f6c2cb2002-11-10 22:06:23 +00004684
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004685 If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
4686 CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
wdenk43d96162003-03-06 00:02:04 +00004687 default value.
wdenk7f6c2cb2002-11-10 22:06:23 +00004688
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004689 if CONFIG_SYS_FDC_HW_INIT is defined, then the function
wdenk43d96162003-03-06 00:02:04 +00004690 fdc_hw_init() is called at the beginning of the FDC
4691 setup. fdc_hw_init() must be provided by the board
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004692 source code. It is used to make hardware-dependent
wdenk43d96162003-03-06 00:02:04 +00004693 initializations.
wdenk7f6c2cb2002-11-10 22:06:23 +00004694
Macpaul Lin0abddf82011-04-11 20:45:32 +00004695- CONFIG_IDE_AHB:
4696 Most IDE controllers were designed to be connected with PCI
4697 interface. Only few of them were designed for AHB interface.
4698 When software is doing ATA command and data transfer to
4699 IDE devices through IDE-AHB controller, some additional
4700 registers accessing to these kind of IDE-AHB controller
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004701 is required.
Macpaul Lin0abddf82011-04-11 20:45:32 +00004702
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004703- CONFIG_SYS_IMMR: Physical address of the Internal Memory.
wdenkefe2a4d2004-12-16 21:44:03 +00004704 DO NOT CHANGE unless you know exactly what you're
wdenk25d67122004-12-10 11:40:40 +00004705 doing! (11-4) [MPC8xx/82xx systems only]
wdenkc6097192002-11-03 00:24:07 +00004706
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004707- CONFIG_SYS_INIT_RAM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00004708
wdenk7152b1d2003-09-05 23:19:14 +00004709 Start address of memory area that can be used for
wdenkc6097192002-11-03 00:24:07 +00004710 initial data and stack; please note that this must be
4711 writable memory that is working WITHOUT special
4712 initialization, i. e. you CANNOT use normal RAM which
4713 will become available only after programming the
4714 memory controller and running certain initialization
4715 sequences.
4716
4717 U-Boot uses the following memory types:
4718 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
4719 - MPC824X: data cache
4720 - PPC4xx: data cache
4721
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004722- CONFIG_SYS_GBL_DATA_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00004723
4724 Offset of the initial data structure in the memory
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004725 area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
4726 CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
wdenkc6097192002-11-03 00:24:07 +00004727 data is located at the end of the available space
Wolfgang Denk553f0982010-10-26 13:32:32 +02004728 (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004729 CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
4730 below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
4731 CONFIG_SYS_GBL_DATA_OFFSET) downward.
wdenkc6097192002-11-03 00:24:07 +00004732
4733 Note:
4734 On the MPC824X (or other systems that use the data
4735 cache for initial memory) the address chosen for
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004736 CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
wdenkc6097192002-11-03 00:24:07 +00004737 point to an otherwise UNUSED address space between
4738 the top of RAM and the start of the PCI space.
4739
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004740- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
wdenkc6097192002-11-03 00:24:07 +00004741
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004742- CONFIG_SYS_SYPCR: System Protection Control (11-9)
wdenkc6097192002-11-03 00:24:07 +00004743
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004744- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
wdenkc6097192002-11-03 00:24:07 +00004745
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004746- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
wdenkc6097192002-11-03 00:24:07 +00004747
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004748- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
wdenkc6097192002-11-03 00:24:07 +00004749
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004750- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
wdenkc6097192002-11-03 00:24:07 +00004751
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004752- CONFIG_SYS_OR_TIMING_SDRAM:
wdenkc6097192002-11-03 00:24:07 +00004753 SDRAM timing
4754
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004755- CONFIG_SYS_MAMR_PTA:
wdenkc6097192002-11-03 00:24:07 +00004756 periodic timer for refresh
4757
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004758- CONFIG_SYS_DER: Debug Event Register (37-47)
wdenkc6097192002-11-03 00:24:07 +00004759
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004760- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
4761 CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
4762 CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
4763 CONFIG_SYS_BR1_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00004764 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
4765
4766- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004767 CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
4768 CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00004769 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
4770
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004771- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
4772 CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
wdenkc6097192002-11-03 00:24:07 +00004773 Machine Mode Register and Memory Periodic Timer
4774 Prescaler definitions (SDRAM timing)
4775
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004776- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00004777 enable I2C microcode relocation patch (MPC8xx);
4778 define relocation offset in DPRAM [DSP2]
4779
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004780- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
Heiko Schocherb423d052008-01-11 01:12:07 +01004781 enable SMC microcode relocation patch (MPC8xx);
4782 define relocation offset in DPRAM [SMC1]
4783
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004784- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00004785 enable SPI microcode relocation patch (MPC8xx);
4786 define relocation offset in DPRAM [SCC4]
4787
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004788- CONFIG_SYS_USE_OSCCLK:
wdenkc6097192002-11-03 00:24:07 +00004789 Use OSCM clock mode on MBX8xx board. Be careful,
4790 wrong setting might damage your board. Read
4791 doc/README.MBX before setting this variable!
4792
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004793- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
wdenk43d96162003-03-06 00:02:04 +00004794 Offset of the bootmode word in DPRAM used by post
4795 (Power On Self Tests). This definition overrides
4796 #define'd default value in commproc.h resp.
4797 cpm_8260.h.
wdenkea909b72002-11-21 23:11:29 +00004798
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004799- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
4800 CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
4801 CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
4802 CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
4803 CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
4804 CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
4805 CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
4806 CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
Stefan Roesea47a12b2010-04-15 16:07:28 +02004807 Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
wdenk5d232d02003-05-22 22:52:13 +00004808
Dirk Eibach9cacf4f2009-02-09 08:18:34 +01004809- CONFIG_PCI_DISABLE_PCIE:
4810 Disable PCI-Express on systems where it is supported but not
4811 required.
4812
Andrew Sharp69fd2d32012-08-29 14:16:32 +00004813- CONFIG_PCI_ENUM_ONLY
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08004814 Only scan through and get the devices on the buses.
Andrew Sharp69fd2d32012-08-29 14:16:32 +00004815 Don't do any setup work, presumably because someone or
4816 something has already done it, and we don't need to do it
4817 a second time. Useful for platforms that are pre-booted
4818 by coreboot or similar.
4819
Gabor Juhos842033e2013-05-30 07:06:12 +00004820- CONFIG_PCI_INDIRECT_BRIDGE:
4821 Enable support for indirect PCI bridges.
4822
Kumar Galaa09b9b62010-12-30 12:09:53 -06004823- CONFIG_SYS_SRIO:
4824 Chip has SRIO or not
4825
4826- CONFIG_SRIO1:
4827 Board has SRIO 1 port available
4828
4829- CONFIG_SRIO2:
4830 Board has SRIO 2 port available
4831
Liu Gangc8b28152013-05-07 16:30:46 +08004832- CONFIG_SRIO_PCIE_BOOT_MASTER
4833 Board can support master function for Boot from SRIO and PCIE
4834
Kumar Galaa09b9b62010-12-30 12:09:53 -06004835- CONFIG_SYS_SRIOn_MEM_VIRT:
4836 Virtual Address of SRIO port 'n' memory region
4837
4838- CONFIG_SYS_SRIOn_MEM_PHYS:
4839 Physical Address of SRIO port 'n' memory region
4840
4841- CONFIG_SYS_SRIOn_MEM_SIZE:
4842 Size of SRIO port 'n' memory region
4843
Fabio Estevam66bd1842013-04-11 09:35:34 +00004844- CONFIG_SYS_NAND_BUSWIDTH_16BIT
4845 Defined to tell the NAND controller that the NAND chip is using
4846 a 16 bit bus.
4847 Not all NAND drivers use this symbol.
Fabio Estevama430e912013-04-11 09:35:35 +00004848 Example of drivers that use it:
Fabio Estevam66bd1842013-04-11 09:35:34 +00004849 - drivers/mtd/nand/ndfc.c
Fabio Estevama430e912013-04-11 09:35:35 +00004850 - drivers/mtd/nand/mxc_nand.c
Alex Watermaneced4622011-05-19 15:08:36 -04004851
4852- CONFIG_SYS_NDFC_EBC0_CFG
4853 Sets the EBC0_CFG register for the NDFC. If not defined
4854 a default value will be used.
4855
Ben Warrenbb99ad62006-09-07 16:50:54 -04004856- CONFIG_SPD_EEPROM
Wolfgang Denk218ca722008-03-26 10:40:12 +01004857 Get DDR timing information from an I2C EEPROM. Common
4858 with pluggable memory modules such as SODIMMs
4859
Ben Warrenbb99ad62006-09-07 16:50:54 -04004860 SPD_EEPROM_ADDRESS
4861 I2C address of the SPD EEPROM
4862
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004863- CONFIG_SYS_SPD_BUS_NUM
Wolfgang Denk218ca722008-03-26 10:40:12 +01004864 If SPD EEPROM is on an I2C bus other than the first
4865 one, specify here. Note that the value must resolve
4866 to something your driver can deal with.
Ben Warrenbb99ad62006-09-07 16:50:54 -04004867
York Sun1b3e3c42011-06-07 09:42:16 +08004868- CONFIG_SYS_DDR_RAW_TIMING
4869 Get DDR timing information from other than SPD. Common with
4870 soldered DDR chips onboard without SPD. DDR raw timing
4871 parameters are extracted from datasheet and hard-coded into
4872 header files or board specific files.
4873
York Sun6f5e1dc2011-09-16 13:21:35 -07004874- CONFIG_FSL_DDR_INTERACTIVE
4875 Enable interactive DDR debugging. See doc/README.fsl-ddr.
4876
York Sune32d59a2015-01-06 13:18:55 -08004877- CONFIG_FSL_DDR_SYNC_REFRESH
4878 Enable sync of refresh for multiple controllers.
4879
York Sun4516ff82015-03-19 09:30:28 -07004880- CONFIG_FSL_DDR_BIST
4881 Enable built-in memory test for Freescale DDR controllers.
4882
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004883- CONFIG_SYS_83XX_DDR_USES_CS0
Wolfgang Denk218ca722008-03-26 10:40:12 +01004884 Only for 83xx systems. If specified, then DDR should
4885 be configured using CS0 and CS1 instead of CS2 and CS3.
Timur Tabi2ad6b512006-10-31 18:44:42 -06004886
wdenkc26e4542004-04-18 10:13:26 +00004887- CONFIG_ETHER_ON_FEC[12]
4888 Define to enable FEC[12] on a 8xx series processor.
4889
4890- CONFIG_FEC[12]_PHY
4891 Define to the hardcoded PHY address which corresponds
wdenk6e592382004-04-18 17:39:38 +00004892 to the given FEC; i. e.
4893 #define CONFIG_FEC1_PHY 4
wdenkc26e4542004-04-18 10:13:26 +00004894 means that the PHY with address 4 is connected to FEC1
4895
4896 When set to -1, means to probe for first available.
4897
4898- CONFIG_FEC[12]_PHY_NORXERR
4899 The PHY does not have a RXERR line (RMII only).
4900 (so program the FEC to ignore it).
4901
4902- CONFIG_RMII
4903 Enable RMII mode for all FECs.
4904 Note that this is a global option, we can't
4905 have one FEC in standard MII mode and another in RMII mode.
4906
wdenk5cf91d62004-04-23 20:32:05 +00004907- CONFIG_CRC32_VERIFY
4908 Add a verify option to the crc32 command.
4909 The syntax is:
4910
4911 => crc32 -v <address> <count> <crc32>
4912
4913 Where address/count indicate a memory area
4914 and crc32 is the correct crc32 which the
4915 area should have.
4916
wdenk56523f12004-07-11 17:40:54 +00004917- CONFIG_LOOPW
4918 Add the "loopw" memory command. This only takes effect if
Jon Loeliger602ad3b2007-06-11 19:03:39 -05004919 the memory commands are activated globally (CONFIG_CMD_MEM).
wdenk56523f12004-07-11 17:40:54 +00004920
stroese7b466642004-12-16 18:46:55 +00004921- CONFIG_MX_CYCLIC
4922 Add the "mdc" and "mwc" memory commands. These are cyclic
4923 "md/mw" commands.
4924 Examples:
4925
wdenkefe2a4d2004-12-16 21:44:03 +00004926 => mdc.b 10 4 500
stroese7b466642004-12-16 18:46:55 +00004927 This command will print 4 bytes (10,11,12,13) each 500 ms.
4928
wdenkefe2a4d2004-12-16 21:44:03 +00004929 => mwc.l 100 12345678 10
stroese7b466642004-12-16 18:46:55 +00004930 This command will write 12345678 to address 100 all 10 ms.
4931
wdenkefe2a4d2004-12-16 21:44:03 +00004932 This only takes effect if the memory commands are activated
Jon Loeliger602ad3b2007-06-11 19:03:39 -05004933 globally (CONFIG_CMD_MEM).
stroese7b466642004-12-16 18:46:55 +00004934
wdenk8aa1a2d2005-04-04 12:44:11 +00004935- CONFIG_SKIP_LOWLEVEL_INIT
Macpaul Linafc1ce82011-10-19 20:41:11 +00004936 [ARM, NDS32, MIPS only] If this variable is defined, then certain
Wolfgang Denk844f07d2010-11-27 23:30:56 +01004937 low level initializations (like setting up the memory
4938 controller) are omitted and/or U-Boot does not
4939 relocate itself into RAM.
wdenk8aa1a2d2005-04-04 12:44:11 +00004940
Wolfgang Denk844f07d2010-11-27 23:30:56 +01004941 Normally this variable MUST NOT be defined. The only
4942 exception is when U-Boot is loaded (to RAM) by some
4943 other boot loader or by a debugger which performs
4944 these initializations itself.
wdenk8aa1a2d2005-04-04 12:44:11 +00004945
Aneesh V401bb302011-07-13 05:11:07 +00004946- CONFIG_SPL_BUILD
Magnus Liljadf812382009-06-13 20:50:00 +02004947 Modifies the behaviour of start.S when compiling a loader
4948 that is executed before the actual U-Boot. E.g. when
4949 compiling a NAND SPL.
wdenk400558b2005-04-02 23:52:25 +00004950
Ying Zhang3aa29de2013-08-16 15:16:15 +08004951- CONFIG_TPL_BUILD
4952 Modifies the behaviour of start.S when compiling a loader
4953 that is executed after the SPL and before the actual U-Boot.
4954 It is loaded by the SPL.
4955
Ying Zhang5df572f2013-05-20 14:07:23 +08004956- CONFIG_SYS_MPC85XX_NO_RESETVEC
4957 Only for 85xx systems. If this variable is specified, the section
4958 .resetvec is not kept and the section .bootpg is placed in the
4959 previous 4k of the .text section.
4960
Simon Glass4213fc22013-02-24 17:33:14 +00004961- CONFIG_ARCH_MAP_SYSMEM
4962 Generally U-Boot (and in particular the md command) uses
4963 effective address. It is therefore not necessary to regard
4964 U-Boot address as virtual addresses that need to be translated
4965 to physical addresses. However, sandbox requires this, since
4966 it maintains its own little RAM buffer which contains all
4967 addressable memory. This option causes some memory accesses
4968 to be mapped through map_sysmem() / unmap_sysmem().
4969
Matthias Weisserd8834a12011-03-10 21:36:32 +00004970- CONFIG_USE_ARCH_MEMCPY
4971 CONFIG_USE_ARCH_MEMSET
4972 If these options are used a optimized version of memcpy/memset will
4973 be used if available. These functions may be faster under some
4974 conditions but may increase the binary size.
4975
Simon Glass588a13f2013-02-14 04:18:54 +00004976- CONFIG_X86_RESET_VECTOR
4977 If defined, the x86 reset vector code is included. This is not
4978 needed when U-Boot is running from Coreboot.
Gabe Blackb16f5212012-11-27 21:08:06 +00004979
Mark Jacksonfc337052013-03-04 01:27:20 +00004980- CONFIG_SYS_MPUCLK
4981 Defines the MPU clock speed (in MHz).
4982
4983 NOTE : currently only supported on AM335x platforms.
Gabe Black5b5ece92012-11-29 16:23:41 +00004984
Heiko Schocher16678eb2013-11-04 14:05:00 +01004985- CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC:
4986 Enables the RTC32K OSC on AM33xx based plattforms
4987
Karicheri, Muralidharan999d7d32014-04-04 13:16:50 -04004988- CONFIG_SYS_NAND_NO_SUBPAGE_WRITE
4989 Option to disable subpage write in NAND driver
4990 driver that uses this:
4991 drivers/mtd/nand/davinci_nand.c
4992
Timur Tabif2717b42011-11-22 09:21:25 -06004993Freescale QE/FMAN Firmware Support:
4994-----------------------------------
4995
4996The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
4997loading of "firmware", which is encoded in the QE firmware binary format.
4998This firmware often needs to be loaded during U-Boot booting, so macros
4999are used to identify the storage device (NOR flash, SPI, etc) and the address
5000within that device.
5001
Zhao Qiangdcf1d772014-03-21 16:21:44 +08005002- CONFIG_SYS_FMAN_FW_ADDR
5003 The address in the storage device where the FMAN microcode is located. The
5004 meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
5005 is also specified.
5006
5007- CONFIG_SYS_QE_FW_ADDR
5008 The address in the storage device where the QE microcode is located. The
Timur Tabif2717b42011-11-22 09:21:25 -06005009 meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
5010 is also specified.
5011
5012- CONFIG_SYS_QE_FMAN_FW_LENGTH
5013 The maximum possible size of the firmware. The firmware binary format
5014 has a field that specifies the actual size of the firmware, but it
5015 might not be possible to read any part of the firmware unless some
5016 local storage is allocated to hold the entire firmware first.
5017
5018- CONFIG_SYS_QE_FMAN_FW_IN_NOR
5019 Specifies that QE/FMAN firmware is located in NOR flash, mapped as
5020 normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the
5021 virtual address in NOR flash.
5022
5023- CONFIG_SYS_QE_FMAN_FW_IN_NAND
5024 Specifies that QE/FMAN firmware is located in NAND flash.
5025 CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
5026
5027- CONFIG_SYS_QE_FMAN_FW_IN_MMC
5028 Specifies that QE/FMAN firmware is located on the primary SD/MMC
5029 device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
5030
5031- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
5032 Specifies that QE/FMAN firmware is located on the primary SPI
5033 device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
5034
Liu Gang292dc6c2012-03-08 00:33:18 +00005035- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
5036 Specifies that QE/FMAN firmware is located in the remote (master)
5037 memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
Liu Gangfc54c7f2012-08-09 05:10:01 +00005038 can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
5039 window->master inbound window->master LAW->the ucode address in
5040 master's memory space.
Timur Tabif2717b42011-11-22 09:21:25 -06005041
J. German Riverab940ca62014-06-23 15:15:55 -07005042Freescale Layerscape Management Complex Firmware Support:
5043---------------------------------------------------------
5044The Freescale Layerscape Management Complex (MC) supports the loading of
5045"firmware".
5046This firmware often needs to be loaded during U-Boot booting, so macros
5047are used to identify the storage device (NOR flash, SPI, etc) and the address
5048within that device.
5049
5050- CONFIG_FSL_MC_ENET
5051 Enable the MC driver for Layerscape SoCs.
5052
5053- CONFIG_SYS_LS_MC_FW_ADDR
5054 The address in the storage device where the firmware is located. The
5055 meaning of this address depends on which CONFIG_SYS_LS_MC_FW_IN_xxx macro
5056 is also specified.
5057
5058- CONFIG_SYS_LS_MC_FW_LENGTH
5059 The maximum possible size of the firmware. The firmware binary format
5060 has a field that specifies the actual size of the firmware, but it
5061 might not be possible to read any part of the firmware unless some
5062 local storage is allocated to hold the entire firmware first.
5063
5064- CONFIG_SYS_LS_MC_FW_IN_NOR
5065 Specifies that MC firmware is located in NOR flash, mapped as
5066 normal addressable memory via the LBC. CONFIG_SYS_LS_MC_FW_ADDR is the
5067 virtual address in NOR flash.
5068
Prabhakar Kushwaha5c055082015-06-02 10:55:52 +05305069Freescale Layerscape Debug Server Support:
5070-------------------------------------------
5071The Freescale Layerscape Debug Server Support supports the loading of
5072"Debug Server firmware" and triggering SP boot-rom.
5073This firmware often needs to be loaded during U-Boot booting.
5074
5075- CONFIG_FSL_DEBUG_SERVER
5076 Enable the Debug Server for Layerscape SoCs.
5077
5078- CONFIG_SYS_DEBUG_SERVER_DRAM_BLOCK_MIN_SIZE
5079 Define minimum DDR size required for debug server image
5080
5081- CONFIG_SYS_MEM_TOP_HIDE_MIN
5082 Define minimum DDR size to be hided from top of the DDR memory
5083
Paul Kocialkowskif3f431a2015-07-26 18:48:15 +02005084Reproducible builds
5085-------------------
5086
5087In order to achieve reproducible builds, timestamps used in the U-Boot build
5088process have to be set to a fixed value.
5089
5090This is done using the SOURCE_DATE_EPOCH environment variable.
5091SOURCE_DATE_EPOCH is to be set on the build host's shell, not as a configuration
5092option for U-Boot or an environment variable in U-Boot.
5093
5094SOURCE_DATE_EPOCH should be set to a number of seconds since the epoch, in UTC.
5095
wdenkc6097192002-11-03 00:24:07 +00005096Building the Software:
5097======================
5098
Wolfgang Denk218ca722008-03-26 10:40:12 +01005099Building U-Boot has been tested in several native build environments
5100and in many different cross environments. Of course we cannot support
5101all possibly existing versions of cross development tools in all
5102(potentially obsolete) versions. In case of tool chain problems we
5103recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
5104which is extensively used to build and test U-Boot.
wdenkc6097192002-11-03 00:24:07 +00005105
Wolfgang Denk218ca722008-03-26 10:40:12 +01005106If you are not using a native environment, it is assumed that you
5107have GNU cross compiling tools available in your path. In this case,
5108you must set the environment variable CROSS_COMPILE in your shell.
5109Note that no changes to the Makefile or any other source files are
5110necessary. For example using the ELDK on a 4xx CPU, please enter:
wdenkc6097192002-11-03 00:24:07 +00005111
Wolfgang Denk218ca722008-03-26 10:40:12 +01005112 $ CROSS_COMPILE=ppc_4xx-
5113 $ export CROSS_COMPILE
wdenkc6097192002-11-03 00:24:07 +00005114
Peter Tyser2f8d3962009-03-13 18:54:51 -05005115Note: If you wish to generate Windows versions of the utilities in
5116 the tools directory you can use the MinGW toolchain
5117 (http://www.mingw.org). Set your HOST tools to the MinGW
5118 toolchain and execute 'make tools'. For example:
5119
5120 $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
5121
5122 Binaries such as tools/mkimage.exe will be created which can
5123 be executed on computers running Windows.
5124
Wolfgang Denk218ca722008-03-26 10:40:12 +01005125U-Boot is intended to be simple to build. After installing the
5126sources you must configure U-Boot for one specific board type. This
wdenkc6097192002-11-03 00:24:07 +00005127is done by typing:
5128
Holger Freytherab584d62014-08-04 09:26:05 +02005129 make NAME_defconfig
wdenkc6097192002-11-03 00:24:07 +00005130
Holger Freytherab584d62014-08-04 09:26:05 +02005131where "NAME_defconfig" is the name of one of the existing configu-
Michael Jones4d675ae2012-03-15 22:48:10 +00005132rations; see boards.cfg for supported names.
wdenk54387ac2003-10-08 22:45:44 +00005133
wdenk2729af92004-05-03 20:45:30 +00005134Note: for some board special configuration names may exist; check if
5135 additional information is available from the board vendor; for
5136 instance, the TQM823L systems are available without (standard)
5137 or with LCD support. You can select such additional "features"
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02005138 when choosing the configuration, i. e.
wdenkc6097192002-11-03 00:24:07 +00005139
Holger Freytherab584d62014-08-04 09:26:05 +02005140 make TQM823L_defconfig
wdenk2729af92004-05-03 20:45:30 +00005141 - will configure for a plain TQM823L, i. e. no LCD support
wdenkc6097192002-11-03 00:24:07 +00005142
Holger Freytherab584d62014-08-04 09:26:05 +02005143 make TQM823L_LCD_defconfig
wdenk2729af92004-05-03 20:45:30 +00005144 - will configure for a TQM823L with U-Boot console on LCD
wdenkc6097192002-11-03 00:24:07 +00005145
wdenk2729af92004-05-03 20:45:30 +00005146 etc.
wdenkc6097192002-11-03 00:24:07 +00005147
wdenkc6097192002-11-03 00:24:07 +00005148
wdenk2729af92004-05-03 20:45:30 +00005149Finally, type "make all", and you should get some working U-Boot
5150images ready for download to / installation on your system:
wdenkc6097192002-11-03 00:24:07 +00005151
wdenk2729af92004-05-03 20:45:30 +00005152- "u-boot.bin" is a raw binary image
5153- "u-boot" is an image in ELF binary format
5154- "u-boot.srec" is in Motorola S-Record format
wdenkc6097192002-11-03 00:24:07 +00005155
Marian Balakowiczbaf31242006-09-07 17:25:40 +02005156By default the build is performed locally and the objects are saved
5157in the source directory. One of the two methods can be used to change
5158this behavior and build U-Boot to some external directory:
5159
51601. Add O= to the make command line invocations:
5161
5162 make O=/tmp/build distclean
Holger Freytherab584d62014-08-04 09:26:05 +02005163 make O=/tmp/build NAME_defconfig
Marian Balakowiczbaf31242006-09-07 17:25:40 +02005164 make O=/tmp/build all
5165
Timo Ketolaadbba992014-11-06 14:39:05 +020051662. Set environment variable KBUILD_OUTPUT to point to the desired location:
Marian Balakowiczbaf31242006-09-07 17:25:40 +02005167
Timo Ketolaadbba992014-11-06 14:39:05 +02005168 export KBUILD_OUTPUT=/tmp/build
Marian Balakowiczbaf31242006-09-07 17:25:40 +02005169 make distclean
Holger Freytherab584d62014-08-04 09:26:05 +02005170 make NAME_defconfig
Marian Balakowiczbaf31242006-09-07 17:25:40 +02005171 make all
5172
Timo Ketolaadbba992014-11-06 14:39:05 +02005173Note that the command line "O=" setting overrides the KBUILD_OUTPUT environment
Marian Balakowiczbaf31242006-09-07 17:25:40 +02005174variable.
5175
wdenkc6097192002-11-03 00:24:07 +00005176
wdenk2729af92004-05-03 20:45:30 +00005177Please be aware that the Makefiles assume you are using GNU make, so
5178for instance on NetBSD you might need to use "gmake" instead of
5179native "make".
wdenkc6097192002-11-03 00:24:07 +00005180
wdenkc6097192002-11-03 00:24:07 +00005181
wdenk2729af92004-05-03 20:45:30 +00005182If the system board that you have is not listed, then you will need
5183to port U-Boot to your hardware platform. To do this, follow these
5184steps:
wdenkc6097192002-11-03 00:24:07 +00005185
wdenk2729af92004-05-03 20:45:30 +000051861. Add a new configuration option for your board to the toplevel
Michael Jones4d675ae2012-03-15 22:48:10 +00005187 "boards.cfg" file, using the existing entries as examples.
5188 Follow the instructions there to keep the boards in order.
wdenk2729af92004-05-03 20:45:30 +000051892. Create a new directory to hold your board specific code. Add any
5190 files you need. In your board directory, you will need at least
5191 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
51923. Create a new configuration file "include/configs/<board>.h" for
5193 your board
51943. If you're porting U-Boot to a new CPU, then also create a new
5195 directory to hold your CPU specific code. Add any files you need.
Holger Freytherab584d62014-08-04 09:26:05 +020051964. Run "make <board>_defconfig" with your new name.
wdenk2729af92004-05-03 20:45:30 +000051975. Type "make", and you should get a working "u-boot.srec" file
5198 to be installed on your target system.
51996. Debug and solve any problems that might arise.
5200 [Of course, this last step is much harder than it sounds.]
wdenkc6097192002-11-03 00:24:07 +00005201
wdenkc6097192002-11-03 00:24:07 +00005202
wdenk2729af92004-05-03 20:45:30 +00005203Testing of U-Boot Modifications, Ports to New Hardware, etc.:
5204==============================================================
wdenkc6097192002-11-03 00:24:07 +00005205
Wolfgang Denk218ca722008-03-26 10:40:12 +01005206If you have modified U-Boot sources (for instance added a new board
5207or support for new devices, a new CPU, etc.) you are expected to
wdenk2729af92004-05-03 20:45:30 +00005208provide feedback to the other developers. The feedback normally takes
5209the form of a "patch", i. e. a context diff against a certain (latest
Wolfgang Denk218ca722008-03-26 10:40:12 +01005210official or latest in the git repository) version of U-Boot sources.
wdenkc6097192002-11-03 00:24:07 +00005211
Wolfgang Denk218ca722008-03-26 10:40:12 +01005212But before you submit such a patch, please verify that your modifi-
5213cation did not break existing code. At least make sure that *ALL* of
wdenk2729af92004-05-03 20:45:30 +00005214the supported boards compile WITHOUT ANY compiler warnings. To do so,
5215just run the "MAKEALL" script, which will configure and build U-Boot
Wolfgang Denk218ca722008-03-26 10:40:12 +01005216for ALL supported system. Be warned, this will take a while. You can
5217select which (cross) compiler to use by passing a `CROSS_COMPILE'
5218environment variable to the script, i. e. to use the ELDK cross tools
5219you can type
wdenkc6097192002-11-03 00:24:07 +00005220
wdenk2729af92004-05-03 20:45:30 +00005221 CROSS_COMPILE=ppc_8xx- MAKEALL
wdenkc6097192002-11-03 00:24:07 +00005222
wdenk2729af92004-05-03 20:45:30 +00005223or to build on a native PowerPC system you can type
wdenkc6097192002-11-03 00:24:07 +00005224
wdenk2729af92004-05-03 20:45:30 +00005225 CROSS_COMPILE=' ' MAKEALL
wdenkc6097192002-11-03 00:24:07 +00005226
Wolfgang Denk218ca722008-03-26 10:40:12 +01005227When using the MAKEALL script, the default behaviour is to build
5228U-Boot in the source directory. This location can be changed by
5229setting the BUILD_DIR environment variable. Also, for each target
5230built, the MAKEALL script saves two log files (<target>.ERR and
5231<target>.MAKEALL) in the <source dir>/LOG directory. This default
5232location can be changed by setting the MAKEALL_LOGDIR environment
5233variable. For example:
Marian Balakowiczbaf31242006-09-07 17:25:40 +02005234
5235 export BUILD_DIR=/tmp/build
5236 export MAKEALL_LOGDIR=/tmp/log
5237 CROSS_COMPILE=ppc_8xx- MAKEALL
5238
Wolfgang Denk218ca722008-03-26 10:40:12 +01005239With the above settings build objects are saved in the /tmp/build,
5240log files are saved in the /tmp/log and the source tree remains clean
5241during the whole build process.
Marian Balakowiczbaf31242006-09-07 17:25:40 +02005242
5243
wdenk2729af92004-05-03 20:45:30 +00005244See also "U-Boot Porting Guide" below.
wdenkc6097192002-11-03 00:24:07 +00005245
wdenkc6097192002-11-03 00:24:07 +00005246
wdenk2729af92004-05-03 20:45:30 +00005247Monitor Commands - Overview:
5248============================
wdenkc6097192002-11-03 00:24:07 +00005249
wdenk2729af92004-05-03 20:45:30 +00005250go - start application at address 'addr'
5251run - run commands in an environment variable
5252bootm - boot application image from memory
5253bootp - boot image via network using BootP/TFTP protocol
Marek Vasut44f074c2012-03-14 21:52:45 +00005254bootz - boot zImage from memory
wdenk2729af92004-05-03 20:45:30 +00005255tftpboot- boot image via network using TFTP protocol
5256 and env variables "ipaddr" and "serverip"
5257 (and eventually "gatewayip")
Simon Glass1fb7cd42011-10-24 18:00:07 +00005258tftpput - upload a file via network using TFTP protocol
wdenk2729af92004-05-03 20:45:30 +00005259rarpboot- boot image via network using RARP/TFTP protocol
5260diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
5261loads - load S-Record file over serial line
5262loadb - load binary file over serial line (kermit mode)
5263md - memory display
5264mm - memory modify (auto-incrementing)
5265nm - memory modify (constant address)
5266mw - memory write (fill)
5267cp - memory copy
5268cmp - memory compare
5269crc32 - checksum calculation
Peter Tyser0f89c542009-04-18 22:34:03 -05005270i2c - I2C sub-system
wdenk2729af92004-05-03 20:45:30 +00005271sspi - SPI utility commands
5272base - print or set address offset
5273printenv- print environment variables
5274setenv - set environment variables
5275saveenv - save environment variables to persistent storage
5276protect - enable or disable FLASH write protection
5277erase - erase FLASH memory
5278flinfo - print FLASH memory information
Karl O. Pinc10635af2012-08-03 05:57:21 +00005279nand - NAND memory operations (see doc/README.nand)
wdenk2729af92004-05-03 20:45:30 +00005280bdinfo - print Board Info structure
5281iminfo - print header information for application image
5282coninfo - print console devices and informations
5283ide - IDE sub-system
5284loop - infinite loop on address range
wdenk56523f12004-07-11 17:40:54 +00005285loopw - infinite write loop on address range
wdenk2729af92004-05-03 20:45:30 +00005286mtest - simple RAM test
5287icache - enable or disable instruction cache
5288dcache - enable or disable data cache
5289reset - Perform RESET of the CPU
5290echo - echo args to console
5291version - print monitor version
5292help - print online help
5293? - alias for 'help'
wdenkc6097192002-11-03 00:24:07 +00005294
wdenkc6097192002-11-03 00:24:07 +00005295
wdenk2729af92004-05-03 20:45:30 +00005296Monitor Commands - Detailed Description:
5297========================================
wdenkc6097192002-11-03 00:24:07 +00005298
wdenk2729af92004-05-03 20:45:30 +00005299TODO.
wdenkc6097192002-11-03 00:24:07 +00005300
wdenk2729af92004-05-03 20:45:30 +00005301For now: just type "help <command>".
wdenkc6097192002-11-03 00:24:07 +00005302
5303
wdenk2729af92004-05-03 20:45:30 +00005304Environment Variables:
5305======================
wdenkc6097192002-11-03 00:24:07 +00005306
wdenk2729af92004-05-03 20:45:30 +00005307U-Boot supports user configuration using Environment Variables which
5308can be made persistent by saving to Flash memory.
wdenkc6097192002-11-03 00:24:07 +00005309
wdenk2729af92004-05-03 20:45:30 +00005310Environment Variables are set using "setenv", printed using
5311"printenv", and saved to Flash using "saveenv". Using "setenv"
5312without a value can be used to delete a variable from the
5313environment. As long as you don't save the environment you are
5314working with an in-memory copy. In case the Flash area containing the
5315environment is erased by accident, a default environment is provided.
wdenkc6097192002-11-03 00:24:07 +00005316
Wolfgang Denkc96f86e2010-01-17 23:55:53 +01005317Some configuration options can be set using Environment Variables.
5318
5319List of environment variables (most likely not complete):
wdenkc6097192002-11-03 00:24:07 +00005320
wdenk2729af92004-05-03 20:45:30 +00005321 baudrate - see CONFIG_BAUDRATE
wdenkc6097192002-11-03 00:24:07 +00005322
wdenk2729af92004-05-03 20:45:30 +00005323 bootdelay - see CONFIG_BOOTDELAY
wdenkc6097192002-11-03 00:24:07 +00005324
wdenk2729af92004-05-03 20:45:30 +00005325 bootcmd - see CONFIG_BOOTCOMMAND
wdenkc6097192002-11-03 00:24:07 +00005326
wdenk2729af92004-05-03 20:45:30 +00005327 bootargs - Boot arguments when booting an RTOS image
wdenkc6097192002-11-03 00:24:07 +00005328
wdenk2729af92004-05-03 20:45:30 +00005329 bootfile - Name of the image to load with TFTP
wdenkc6097192002-11-03 00:24:07 +00005330
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02005331 bootm_low - Memory range available for image processing in the bootm
5332 command can be restricted. This variable is given as
5333 a hexadecimal number and defines lowest address allowed
5334 for use by the bootm command. See also "bootm_size"
5335 environment variable. Address defined by "bootm_low" is
5336 also the base of the initial memory mapping for the Linux
Grant Likelyc3624e62011-03-28 09:58:43 +00005337 kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
5338 bootm_mapsize.
5339
Wolfgang Denkc0f40852011-10-26 10:21:21 +00005340 bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
Grant Likelyc3624e62011-03-28 09:58:43 +00005341 This variable is given as a hexadecimal number and it
5342 defines the size of the memory region starting at base
5343 address bootm_low that is accessible by the Linux kernel
5344 during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used
5345 as the default value if it is defined, and bootm_size is
5346 used otherwise.
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02005347
5348 bootm_size - Memory range available for image processing in the bootm
5349 command can be restricted. This variable is given as
5350 a hexadecimal number and defines the size of the region
5351 allowed for use by the bootm command. See also "bootm_low"
5352 environment variable.
5353
Bartlomiej Sieka4bae9092008-10-01 15:26:31 +02005354 updatefile - Location of the software update file on a TFTP server, used
5355 by the automatic software update feature. Please refer to
5356 documentation in doc/README.update for more details.
5357
wdenk2729af92004-05-03 20:45:30 +00005358 autoload - if set to "no" (any string beginning with 'n'),
5359 "bootp" will just load perform a lookup of the
5360 configuration from the BOOTP server, but not try to
5361 load any image using TFTP
wdenkc6097192002-11-03 00:24:07 +00005362
wdenk2729af92004-05-03 20:45:30 +00005363 autostart - if set to "yes", an image loaded using the "bootp",
5364 "rarpboot", "tftpboot" or "diskboot" commands will
5365 be automatically started (by internally calling
5366 "bootm")
wdenkc6097192002-11-03 00:24:07 +00005367
wdenk2729af92004-05-03 20:45:30 +00005368 If set to "no", a standalone image passed to the
5369 "bootm" command will be copied to the load address
5370 (and eventually uncompressed), but NOT be started.
5371 This can be used to load and uncompress arbitrary
5372 data.
wdenkc6097192002-11-03 00:24:07 +00005373
David A. Longa28afca2011-07-09 16:40:19 -04005374 fdt_high - if set this restricts the maximum address that the
5375 flattened device tree will be copied into upon boot.
Shawn Guofa34f6b2012-01-09 21:54:08 +00005376 For example, if you have a system with 1 GB memory
5377 at physical address 0x10000000, while Linux kernel
5378 only recognizes the first 704 MB as low memory, you
5379 may need to set fdt_high as 0x3C000000 to have the
5380 device tree blob be copied to the maximum address
5381 of the 704 MB low memory, so that Linux kernel can
5382 access it during the boot procedure.
5383
David A. Longa28afca2011-07-09 16:40:19 -04005384 If this is set to the special value 0xFFFFFFFF then
5385 the fdt will not be copied at all on boot. For this
5386 to work it must reside in writable memory, have
5387 sufficient padding on the end of it for u-boot to
5388 add the information it needs into it, and the memory
5389 must be accessible by the kernel.
5390
Simon Glasseea63e02011-10-24 19:15:34 +00005391 fdtcontroladdr- if set this is the address of the control flattened
5392 device tree used by U-Boot when CONFIG_OF_CONTROL is
5393 defined.
5394
wdenk17ea1172004-06-06 21:51:03 +00005395 i2cfast - (PPC405GP|PPC405EP only)
5396 if set to 'y' configures Linux I2C driver for fast
5397 mode (400kHZ). This environment variable is used in
5398 initialization code. So, for changes to be effective
5399 it must be saved and board must be reset.
5400
wdenk2729af92004-05-03 20:45:30 +00005401 initrd_high - restrict positioning of initrd images:
5402 If this variable is not set, initrd images will be
5403 copied to the highest possible address in RAM; this
5404 is usually what you want since it allows for
5405 maximum initrd size. If for some reason you want to
5406 make sure that the initrd image is loaded below the
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02005407 CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
wdenk2729af92004-05-03 20:45:30 +00005408 variable to a value of "no" or "off" or "0".
5409 Alternatively, you can set it to a maximum upper
5410 address to use (U-Boot will still check that it
5411 does not overwrite the U-Boot stack and data).
wdenkc6097192002-11-03 00:24:07 +00005412
wdenk2729af92004-05-03 20:45:30 +00005413 For instance, when you have a system with 16 MB
5414 RAM, and want to reserve 4 MB from use by Linux,
5415 you can do this by adding "mem=12M" to the value of
5416 the "bootargs" variable. However, now you must make
5417 sure that the initrd image is placed in the first
5418 12 MB as well - this can be done with
wdenkc6097192002-11-03 00:24:07 +00005419
wdenk2729af92004-05-03 20:45:30 +00005420 setenv initrd_high 00c00000
wdenkc6097192002-11-03 00:24:07 +00005421
wdenk2729af92004-05-03 20:45:30 +00005422 If you set initrd_high to 0xFFFFFFFF, this is an
5423 indication to U-Boot that all addresses are legal
5424 for the Linux kernel, including addresses in flash
5425 memory. In this case U-Boot will NOT COPY the
5426 ramdisk at all. This may be useful to reduce the
5427 boot time on your system, but requires that this
5428 feature is supported by your Linux kernel.
wdenk4a6fd342003-04-12 23:38:12 +00005429
wdenk2729af92004-05-03 20:45:30 +00005430 ipaddr - IP address; needed for tftpboot command
wdenkc6097192002-11-03 00:24:07 +00005431
wdenk2729af92004-05-03 20:45:30 +00005432 loadaddr - Default load address for commands like "bootp",
5433 "rarpboot", "tftpboot", "loadb" or "diskboot"
wdenkc6097192002-11-03 00:24:07 +00005434
wdenk2729af92004-05-03 20:45:30 +00005435 loads_echo - see CONFIG_LOADS_ECHO
wdenkc6097192002-11-03 00:24:07 +00005436
wdenk2729af92004-05-03 20:45:30 +00005437 serverip - TFTP server IP address; needed for tftpboot command
wdenk38b99262003-05-23 23:18:21 +00005438
wdenk2729af92004-05-03 20:45:30 +00005439 bootretry - see CONFIG_BOOT_RETRY_TIME
wdenkc6097192002-11-03 00:24:07 +00005440
wdenk2729af92004-05-03 20:45:30 +00005441 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
wdenkc6097192002-11-03 00:24:07 +00005442
wdenk2729af92004-05-03 20:45:30 +00005443 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
wdenkc6097192002-11-03 00:24:07 +00005444
Mike Frysingere2a53452011-10-02 10:01:27 +00005445 ethprime - controls which interface is used first.
wdenkc6097192002-11-03 00:24:07 +00005446
Mike Frysingere2a53452011-10-02 10:01:27 +00005447 ethact - controls which interface is currently active.
5448 For example you can do the following
wdenkc6097192002-11-03 00:24:07 +00005449
Heiko Schocher48690d82010-07-20 17:45:02 +02005450 => setenv ethact FEC
5451 => ping 192.168.0.1 # traffic sent on FEC
5452 => setenv ethact SCC
5453 => ping 10.0.0.1 # traffic sent on SCC
wdenkc6097192002-11-03 00:24:07 +00005454
Matthias Fuchse1692572008-01-17 07:45:05 +01005455 ethrotate - When set to "no" U-Boot does not go through all
5456 available network interfaces.
5457 It just stays at the currently selected interface.
5458
Wolfgang Denkc96f86e2010-01-17 23:55:53 +01005459 netretry - When set to "no" each network operation will
wdenk2729af92004-05-03 20:45:30 +00005460 either succeed or fail without retrying.
5461 When set to "once" the network operation will
5462 fail when all the available network interfaces
5463 are tried once without success.
5464 Useful on scripts which control the retry operation
5465 themselves.
wdenkc6097192002-11-03 00:24:07 +00005466
Jean-Christophe PLAGNIOL-VILLARDb4e2f892009-01-31 09:53:39 +01005467 npe_ucode - set load address for the NPE microcode
Jean-Christophe PLAGNIOL-VILLARDa1cf0272008-01-07 08:41:34 +01005468
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08005469 silent_linux - If set then Linux will be told to boot silently, by
Simon Glass8d51aac2013-07-16 20:10:00 -07005470 changing the console to be empty. If "yes" it will be
5471 made silent. If "no" it will not be made silent. If
5472 unset, then it will be made silent if the U-Boot console
5473 is silent.
5474
Wolfgang Denk28cb9372005-09-24 23:25:46 +02005475 tftpsrcport - If this is set, the value is used for TFTP's
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02005476 UDP source port.
5477
Wolfgang Denk28cb9372005-09-24 23:25:46 +02005478 tftpdstport - If this is set, the value is used for TFTP's UDP
5479 destination port instead of the Well Know Port 69.
5480
Wolfgang Denkc96f86e2010-01-17 23:55:53 +01005481 tftpblocksize - Block size to use for TFTP transfers; if not set,
5482 we use the TFTP server's default block size
5483
5484 tftptimeout - Retransmission timeout for TFTP packets (in milli-
5485 seconds, minimum value is 1000 = 1 second). Defines
5486 when a packet is considered to be lost so it has to
5487 be retransmitted. The default is 5000 = 5 seconds.
5488 Lowering this value may make downloads succeed
5489 faster in networks with high packet loss rates or
5490 with unreliable TFTP servers.
5491
5492 vlan - When set to a value < 4095 the traffic over
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02005493 Ethernet is encapsulated/received over 802.1q
wdenk2729af92004-05-03 20:45:30 +00005494 VLAN tagged frames.
wdenka3d991b2004-04-15 21:48:45 +00005495
Jason Hobbsdc0b7b02011-08-31 05:37:28 +00005496The following image location variables contain the location of images
5497used in booting. The "Image" column gives the role of the image and is
5498not an environment variable name. The other columns are environment
5499variable names. "File Name" gives the name of the file on a TFTP
5500server, "RAM Address" gives the location in RAM the image will be
5501loaded to, and "Flash Location" gives the image's address in NOR
5502flash or offset in NAND flash.
5503
5504*Note* - these variables don't have to be defined for all boards, some
Fabio Estevamaed9fed2015-04-25 18:53:10 -03005505boards currently use other variables for these purposes, and some
Jason Hobbsdc0b7b02011-08-31 05:37:28 +00005506boards use these variables for other purposes.
5507
Wolfgang Denkc0f40852011-10-26 10:21:21 +00005508Image File Name RAM Address Flash Location
5509----- --------- ----------- --------------
5510u-boot u-boot u-boot_addr_r u-boot_addr
5511Linux kernel bootfile kernel_addr_r kernel_addr
5512device tree blob fdtfile fdt_addr_r fdt_addr
5513ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr
Jason Hobbsdc0b7b02011-08-31 05:37:28 +00005514
wdenk2729af92004-05-03 20:45:30 +00005515The following environment variables may be used and automatically
5516updated by the network boot commands ("bootp" and "rarpboot"),
5517depending the information provided by your boot server:
wdenka3d991b2004-04-15 21:48:45 +00005518
wdenk2729af92004-05-03 20:45:30 +00005519 bootfile - see above
5520 dnsip - IP address of your Domain Name Server
5521 dnsip2 - IP address of your secondary Domain Name Server
5522 gatewayip - IP address of the Gateway (Router) to use
5523 hostname - Target hostname
5524 ipaddr - see above
5525 netmask - Subnet Mask
5526 rootpath - Pathname of the root filesystem on the NFS server
5527 serverip - see above
wdenka3d991b2004-04-15 21:48:45 +00005528
wdenka3d991b2004-04-15 21:48:45 +00005529
wdenk2729af92004-05-03 20:45:30 +00005530There are two special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00005531
wdenk2729af92004-05-03 20:45:30 +00005532 serial# - contains hardware identification information such
5533 as type string and/or serial number
5534 ethaddr - Ethernet address
wdenkc6097192002-11-03 00:24:07 +00005535
wdenk2729af92004-05-03 20:45:30 +00005536These variables can be set only once (usually during manufacturing of
5537the board). U-Boot refuses to delete or overwrite these variables
5538once they have been set once.
wdenkc6097192002-11-03 00:24:07 +00005539
5540
wdenk2729af92004-05-03 20:45:30 +00005541Further special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00005542
wdenk2729af92004-05-03 20:45:30 +00005543 ver - Contains the U-Boot version string as printed
5544 with the "version" command. This variable is
5545 readonly (see CONFIG_VERSION_VARIABLE).
wdenkc6097192002-11-03 00:24:07 +00005546
wdenkc6097192002-11-03 00:24:07 +00005547
wdenk2729af92004-05-03 20:45:30 +00005548Please note that changes to some configuration parameters may take
5549only effect after the next boot (yes, that's just like Windoze :-).
wdenkc6097192002-11-03 00:24:07 +00005550
stroesec1551ea2003-04-04 15:53:41 +00005551
Joe Hershberger170ab112012-12-11 22:16:24 -06005552Callback functions for environment variables:
5553---------------------------------------------
5554
5555For some environment variables, the behavior of u-boot needs to change
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08005556when their values are changed. This functionality allows functions to
Joe Hershberger170ab112012-12-11 22:16:24 -06005557be associated with arbitrary variables. On creation, overwrite, or
5558deletion, the callback will provide the opportunity for some side
5559effect to happen or for the change to be rejected.
5560
5561The callbacks are named and associated with a function using the
5562U_BOOT_ENV_CALLBACK macro in your board or driver code.
5563
5564These callbacks are associated with variables in one of two ways. The
5565static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
5566in the board configuration to a string that defines a list of
5567associations. The list must be in the following format:
5568
5569 entry = variable_name[:callback_name]
5570 list = entry[,list]
5571
5572If the callback name is not specified, then the callback is deleted.
5573Spaces are also allowed anywhere in the list.
5574
5575Callbacks can also be associated by defining the ".callbacks" variable
5576with the same list format above. Any association in ".callbacks" will
5577override any association in the static list. You can define
5578CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08005579".callbacks" environment variable in the default or embedded environment.
Joe Hershberger170ab112012-12-11 22:16:24 -06005580
Joe Hershbergerbdf1fe42015-05-20 14:27:20 -05005581If CONFIG_REGEX is defined, the variable_name above is evaluated as a
5582regular expression. This allows multiple variables to be connected to
5583the same callback without explicitly listing them all out.
5584
Joe Hershberger170ab112012-12-11 22:16:24 -06005585
wdenk2729af92004-05-03 20:45:30 +00005586Command Line Parsing:
5587=====================
stroesec1551ea2003-04-04 15:53:41 +00005588
wdenk2729af92004-05-03 20:45:30 +00005589There are two different command line parsers available with U-Boot:
5590the old "simple" one, and the much more powerful "hush" shell:
stroesec1551ea2003-04-04 15:53:41 +00005591
wdenk2729af92004-05-03 20:45:30 +00005592Old, simple command line parser:
5593--------------------------------
wdenkc6097192002-11-03 00:24:07 +00005594
wdenk2729af92004-05-03 20:45:30 +00005595- supports environment variables (through setenv / saveenv commands)
5596- several commands on one line, separated by ';'
Wolfgang Denkfe126d82005-11-20 21:40:11 +01005597- variable substitution using "... ${name} ..." syntax
wdenk2729af92004-05-03 20:45:30 +00005598- special characters ('$', ';') can be escaped by prefixing with '\',
5599 for example:
Wolfgang Denkfe126d82005-11-20 21:40:11 +01005600 setenv bootcmd bootm \${address}
wdenk2729af92004-05-03 20:45:30 +00005601- You can also escape text by enclosing in single apostrophes, for example:
5602 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
wdenkc6097192002-11-03 00:24:07 +00005603
wdenk2729af92004-05-03 20:45:30 +00005604Hush shell:
5605-----------
wdenkf07771c2003-05-28 08:06:31 +00005606
wdenk2729af92004-05-03 20:45:30 +00005607- similar to Bourne shell, with control structures like
5608 if...then...else...fi, for...do...done; while...do...done,
5609 until...do...done, ...
5610- supports environment ("global") variables (through setenv / saveenv
5611 commands) and local shell variables (through standard shell syntax
5612 "name=value"); only environment variables can be used with "run"
5613 command
wdenkf07771c2003-05-28 08:06:31 +00005614
wdenk2729af92004-05-03 20:45:30 +00005615General rules:
5616--------------
wdenkf07771c2003-05-28 08:06:31 +00005617
wdenk2729af92004-05-03 20:45:30 +00005618(1) If a command line (or an environment variable executed by a "run"
5619 command) contains several commands separated by semicolon, and
5620 one of these commands fails, then the remaining commands will be
5621 executed anyway.
wdenkf07771c2003-05-28 08:06:31 +00005622
wdenk2729af92004-05-03 20:45:30 +00005623(2) If you execute several variables with one call to run (i. e.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02005624 calling run with a list of variables as arguments), any failing
wdenk2729af92004-05-03 20:45:30 +00005625 command will cause "run" to terminate, i. e. the remaining
5626 variables are not executed.
wdenkf07771c2003-05-28 08:06:31 +00005627
wdenk2729af92004-05-03 20:45:30 +00005628Note for Redundant Ethernet Interfaces:
5629=======================================
wdenkf07771c2003-05-28 08:06:31 +00005630
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02005631Some boards come with redundant Ethernet interfaces; U-Boot supports
wdenk2729af92004-05-03 20:45:30 +00005632such configurations and is capable of automatic selection of a
5633"working" interface when needed. MAC assignment works as follows:
wdenkf07771c2003-05-28 08:06:31 +00005634
wdenk2729af92004-05-03 20:45:30 +00005635Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
5636MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
5637"eth1addr" (=>eth1), "eth2addr", ...
wdenkf07771c2003-05-28 08:06:31 +00005638
wdenk2729af92004-05-03 20:45:30 +00005639If the network interface stores some valid MAC address (for instance
5640in SROM), this is used as default address if there is NO correspon-
5641ding setting in the environment; if the corresponding environment
5642variable is set, this overrides the settings in the card; that means:
wdenkf07771c2003-05-28 08:06:31 +00005643
wdenk2729af92004-05-03 20:45:30 +00005644o If the SROM has a valid MAC address, and there is no address in the
5645 environment, the SROM's address is used.
wdenkc6097192002-11-03 00:24:07 +00005646
wdenk2729af92004-05-03 20:45:30 +00005647o If there is no valid address in the SROM, and a definition in the
5648 environment exists, then the value from the environment variable is
5649 used.
wdenkc6097192002-11-03 00:24:07 +00005650
wdenk2729af92004-05-03 20:45:30 +00005651o If both the SROM and the environment contain a MAC address, and
5652 both addresses are the same, this MAC address is used.
wdenkc6097192002-11-03 00:24:07 +00005653
wdenk2729af92004-05-03 20:45:30 +00005654o If both the SROM and the environment contain a MAC address, and the
5655 addresses differ, the value from the environment is used and a
5656 warning is printed.
wdenkc6097192002-11-03 00:24:07 +00005657
wdenk2729af92004-05-03 20:45:30 +00005658o If neither SROM nor the environment contain a MAC address, an error
Joe Hershbergerbef10142015-05-04 14:55:13 -05005659 is raised. If CONFIG_NET_RANDOM_ETHADDR is defined, then in this case
5660 a random, locally-assigned MAC is used.
wdenkc6097192002-11-03 00:24:07 +00005661
Ben Warrenecee9322010-04-26 11:11:46 -07005662If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
Wolfgang Denkc0f40852011-10-26 10:21:21 +00005663will be programmed into hardware as part of the initialization process. This
Ben Warrenecee9322010-04-26 11:11:46 -07005664may be skipped by setting the appropriate 'ethmacskip' environment variable.
5665The naming convention is as follows:
5666"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
wdenkc6097192002-11-03 00:24:07 +00005667
wdenk2729af92004-05-03 20:45:30 +00005668Image Formats:
5669==============
wdenkc6097192002-11-03 00:24:07 +00005670
Marian Balakowicz3310c542008-03-12 12:13:13 +01005671U-Boot is capable of booting (and performing other auxiliary operations on)
5672images in two formats:
5673
5674New uImage format (FIT)
5675-----------------------
5676
5677Flexible and powerful format based on Flattened Image Tree -- FIT (similar
5678to Flattened Device Tree). It allows the use of images with multiple
5679components (several kernels, ramdisks, etc.), with contents protected by
5680SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
5681
5682
5683Old uImage format
5684-----------------
5685
5686Old image format is based on binary files which can be basically anything,
5687preceded by a special header; see the definitions in include/image.h for
5688details; basically, the header defines the following image properties:
wdenkc6097192002-11-03 00:24:07 +00005689
wdenk2729af92004-05-03 20:45:30 +00005690* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
5691 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
Peter Tyserf5ed9e32008-09-08 14:56:49 -05005692 LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
5693 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
5694 INTEGRITY).
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02005695* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
Macpaul Linafc1ce82011-10-19 20:41:11 +00005696 IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
5697 Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
wdenk2729af92004-05-03 20:45:30 +00005698* Compression Type (uncompressed, gzip, bzip2)
5699* Load Address
5700* Entry Point
5701* Image Name
5702* Image Timestamp
wdenkc6097192002-11-03 00:24:07 +00005703
wdenk2729af92004-05-03 20:45:30 +00005704The header is marked by a special Magic Number, and both the header
5705and the data portions of the image are secured against corruption by
5706CRC32 checksums.
wdenkc6097192002-11-03 00:24:07 +00005707
wdenkc6097192002-11-03 00:24:07 +00005708
wdenk2729af92004-05-03 20:45:30 +00005709Linux Support:
5710==============
wdenkc6097192002-11-03 00:24:07 +00005711
wdenk2729af92004-05-03 20:45:30 +00005712Although U-Boot should support any OS or standalone application
5713easily, the main focus has always been on Linux during the design of
5714U-Boot.
wdenkc6097192002-11-03 00:24:07 +00005715
wdenk2729af92004-05-03 20:45:30 +00005716U-Boot includes many features that so far have been part of some
5717special "boot loader" code within the Linux kernel. Also, any
5718"initrd" images to be used are no longer part of one big Linux image;
5719instead, kernel and "initrd" are separate images. This implementation
5720serves several purposes:
wdenkc6097192002-11-03 00:24:07 +00005721
wdenk2729af92004-05-03 20:45:30 +00005722- the same features can be used for other OS or standalone
5723 applications (for instance: using compressed images to reduce the
5724 Flash memory footprint)
wdenkc6097192002-11-03 00:24:07 +00005725
wdenk2729af92004-05-03 20:45:30 +00005726- it becomes much easier to port new Linux kernel versions because
5727 lots of low-level, hardware dependent stuff are done by U-Boot
wdenkc6097192002-11-03 00:24:07 +00005728
wdenk2729af92004-05-03 20:45:30 +00005729- the same Linux kernel image can now be used with different "initrd"
5730 images; of course this also means that different kernel images can
5731 be run with the same "initrd". This makes testing easier (you don't
5732 have to build a new "zImage.initrd" Linux image when you just
5733 change a file in your "initrd"). Also, a field-upgrade of the
5734 software is easier now.
wdenkc6097192002-11-03 00:24:07 +00005735
wdenkc6097192002-11-03 00:24:07 +00005736
wdenk2729af92004-05-03 20:45:30 +00005737Linux HOWTO:
5738============
wdenkc6097192002-11-03 00:24:07 +00005739
wdenk2729af92004-05-03 20:45:30 +00005740Porting Linux to U-Boot based systems:
5741---------------------------------------
wdenkc6097192002-11-03 00:24:07 +00005742
wdenk2729af92004-05-03 20:45:30 +00005743U-Boot cannot save you from doing all the necessary modifications to
5744configure the Linux device drivers for use with your target hardware
5745(no, we don't intend to provide a full virtual machine interface to
5746Linux :-).
wdenkc6097192002-11-03 00:24:07 +00005747
Stefan Roesea47a12b2010-04-15 16:07:28 +02005748But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
wdenkc6097192002-11-03 00:24:07 +00005749
wdenk2729af92004-05-03 20:45:30 +00005750Just make sure your machine specific header file (for instance
5751include/asm-ppc/tqm8xx.h) includes the same definition of the Board
Markus Heidelberg1dc30692008-09-07 20:18:27 +02005752Information structure as we define in include/asm-<arch>/u-boot.h,
5753and make sure that your definition of IMAP_ADDR uses the same value
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02005754as your U-Boot configuration in CONFIG_SYS_IMMR.
wdenkc6097192002-11-03 00:24:07 +00005755
Simon Glass2eb31b12014-06-11 23:29:46 -06005756Note that U-Boot now has a driver model, a unified model for drivers.
5757If you are adding a new driver, plumb it into driver model. If there
5758is no uclass available, you are encouraged to create one. See
5759doc/driver-model.
5760
wdenkc6097192002-11-03 00:24:07 +00005761
wdenk2729af92004-05-03 20:45:30 +00005762Configuring the Linux kernel:
5763-----------------------------
wdenkc6097192002-11-03 00:24:07 +00005764
wdenk2729af92004-05-03 20:45:30 +00005765No specific requirements for U-Boot. Make sure you have some root
5766device (initial ramdisk, NFS) for your target system.
wdenkc6097192002-11-03 00:24:07 +00005767
wdenkc6097192002-11-03 00:24:07 +00005768
wdenk2729af92004-05-03 20:45:30 +00005769Building a Linux Image:
5770-----------------------
wdenkc6097192002-11-03 00:24:07 +00005771
wdenk2729af92004-05-03 20:45:30 +00005772With U-Boot, "normal" build targets like "zImage" or "bzImage" are
5773not used. If you use recent kernel source, a new build target
5774"uImage" will exist which automatically builds an image usable by
5775U-Boot. Most older kernels also have support for a "pImage" target,
5776which was introduced for our predecessor project PPCBoot and uses a
5777100% compatible format.
wdenkc6097192002-11-03 00:24:07 +00005778
wdenk2729af92004-05-03 20:45:30 +00005779Example:
wdenkc6097192002-11-03 00:24:07 +00005780
Holger Freytherab584d62014-08-04 09:26:05 +02005781 make TQM850L_defconfig
wdenk2729af92004-05-03 20:45:30 +00005782 make oldconfig
5783 make dep
5784 make uImage
wdenkc6097192002-11-03 00:24:07 +00005785
wdenk2729af92004-05-03 20:45:30 +00005786The "uImage" build target uses a special tool (in 'tools/mkimage') to
5787encapsulate a compressed Linux kernel image with header information,
5788CRC32 checksum etc. for use with U-Boot. This is what we are doing:
wdenkc6097192002-11-03 00:24:07 +00005789
wdenk2729af92004-05-03 20:45:30 +00005790* build a standard "vmlinux" kernel image (in ELF binary format):
wdenkc6097192002-11-03 00:24:07 +00005791
wdenk2729af92004-05-03 20:45:30 +00005792* convert the kernel into a raw binary image:
wdenkc6097192002-11-03 00:24:07 +00005793
wdenk2729af92004-05-03 20:45:30 +00005794 ${CROSS_COMPILE}-objcopy -O binary \
5795 -R .note -R .comment \
5796 -S vmlinux linux.bin
wdenkc6097192002-11-03 00:24:07 +00005797
wdenk2729af92004-05-03 20:45:30 +00005798* compress the binary image:
wdenkc6097192002-11-03 00:24:07 +00005799
wdenk2729af92004-05-03 20:45:30 +00005800 gzip -9 linux.bin
wdenkc6097192002-11-03 00:24:07 +00005801
wdenk2729af92004-05-03 20:45:30 +00005802* package compressed binary image for U-Boot:
wdenk24ee89b2002-11-03 17:56:27 +00005803
wdenk2729af92004-05-03 20:45:30 +00005804 mkimage -A ppc -O linux -T kernel -C gzip \
5805 -a 0 -e 0 -n "Linux Kernel Image" \
5806 -d linux.bin.gz uImage
wdenk24ee89b2002-11-03 17:56:27 +00005807
wdenk24ee89b2002-11-03 17:56:27 +00005808
wdenk2729af92004-05-03 20:45:30 +00005809The "mkimage" tool can also be used to create ramdisk images for use
5810with U-Boot, either separated from the Linux kernel image, or
5811combined into one file. "mkimage" encapsulates the images with a 64
5812byte header containing information about target architecture,
5813operating system, image type, compression method, entry points, time
5814stamp, CRC32 checksums, etc.
wdenk24ee89b2002-11-03 17:56:27 +00005815
wdenk2729af92004-05-03 20:45:30 +00005816"mkimage" can be called in two ways: to verify existing images and
5817print the header information, or to build new images.
wdenk24ee89b2002-11-03 17:56:27 +00005818
wdenk2729af92004-05-03 20:45:30 +00005819In the first form (with "-l" option) mkimage lists the information
5820contained in the header of an existing U-Boot image; this includes
5821checksum verification:
wdenk24ee89b2002-11-03 17:56:27 +00005822
wdenk2729af92004-05-03 20:45:30 +00005823 tools/mkimage -l image
5824 -l ==> list image header information
wdenk24ee89b2002-11-03 17:56:27 +00005825
wdenk2729af92004-05-03 20:45:30 +00005826The second form (with "-d" option) is used to build a U-Boot image
5827from a "data file" which is used as image payload:
wdenk24ee89b2002-11-03 17:56:27 +00005828
wdenk2729af92004-05-03 20:45:30 +00005829 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
5830 -n name -d data_file image
5831 -A ==> set architecture to 'arch'
5832 -O ==> set operating system to 'os'
5833 -T ==> set image type to 'type'
5834 -C ==> set compression type 'comp'
5835 -a ==> set load address to 'addr' (hex)
5836 -e ==> set entry point to 'ep' (hex)
5837 -n ==> set image name to 'name'
5838 -d ==> use image data from 'datafile'
wdenk24ee89b2002-11-03 17:56:27 +00005839
wdenk69459792004-05-29 16:53:29 +00005840Right now, all Linux kernels for PowerPC systems use the same load
5841address (0x00000000), but the entry point address depends on the
5842kernel version:
wdenkc6097192002-11-03 00:24:07 +00005843
wdenk2729af92004-05-03 20:45:30 +00005844- 2.2.x kernels have the entry point at 0x0000000C,
5845- 2.3.x and later kernels have the entry point at 0x00000000.
wdenkc6097192002-11-03 00:24:07 +00005846
wdenk2729af92004-05-03 20:45:30 +00005847So a typical call to build a U-Boot image would read:
wdenkc6097192002-11-03 00:24:07 +00005848
wdenk2729af92004-05-03 20:45:30 +00005849 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
5850 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
Stefan Roesea47a12b2010-04-15 16:07:28 +02005851 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
wdenk2729af92004-05-03 20:45:30 +00005852 > examples/uImage.TQM850L
5853 Image Name: 2.4.4 kernel for TQM850L
5854 Created: Wed Jul 19 02:34:59 2000
5855 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5856 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
5857 Load Address: 0x00000000
5858 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00005859
wdenk2729af92004-05-03 20:45:30 +00005860To verify the contents of the image (or check for corruption):
wdenkc6097192002-11-03 00:24:07 +00005861
wdenk2729af92004-05-03 20:45:30 +00005862 -> tools/mkimage -l examples/uImage.TQM850L
5863 Image Name: 2.4.4 kernel for TQM850L
5864 Created: Wed Jul 19 02:34:59 2000
5865 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5866 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
5867 Load Address: 0x00000000
5868 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00005869
wdenk2729af92004-05-03 20:45:30 +00005870NOTE: for embedded systems where boot time is critical you can trade
5871speed for memory and install an UNCOMPRESSED image instead: this
5872needs more space in Flash, but boots much faster since it does not
5873need to be uncompressed:
wdenkc6097192002-11-03 00:24:07 +00005874
Stefan Roesea47a12b2010-04-15 16:07:28 +02005875 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
wdenk2729af92004-05-03 20:45:30 +00005876 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
5877 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
Stefan Roesea47a12b2010-04-15 16:07:28 +02005878 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
wdenk2729af92004-05-03 20:45:30 +00005879 > examples/uImage.TQM850L-uncompressed
5880 Image Name: 2.4.4 kernel for TQM850L
5881 Created: Wed Jul 19 02:34:59 2000
5882 Image Type: PowerPC Linux Kernel Image (uncompressed)
5883 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
5884 Load Address: 0x00000000
5885 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00005886
wdenkc6097192002-11-03 00:24:07 +00005887
wdenk2729af92004-05-03 20:45:30 +00005888Similar you can build U-Boot images from a 'ramdisk.image.gz' file
5889when your kernel is intended to use an initial ramdisk:
wdenkdb01a2e2004-04-15 23:14:49 +00005890
wdenk2729af92004-05-03 20:45:30 +00005891 -> tools/mkimage -n 'Simple Ramdisk Image' \
5892 > -A ppc -O linux -T ramdisk -C gzip \
5893 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
5894 Image Name: Simple Ramdisk Image
5895 Created: Wed Jan 12 14:01:50 2000
5896 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
5897 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
5898 Load Address: 0x00000000
5899 Entry Point: 0x00000000
wdenkdb01a2e2004-04-15 23:14:49 +00005900
Guilherme Maciel Ferreiraa804b5c2013-12-01 12:43:11 -07005901The "dumpimage" is a tool to disassemble images built by mkimage. Its "-i"
5902option performs the converse operation of the mkimage's second form (the "-d"
5903option). Given an image built by mkimage, the dumpimage extracts a "data file"
5904from the image:
5905
Guilherme Maciel Ferreiraf41f5b72015-01-15 02:54:40 -02005906 tools/dumpimage -i image -T type -p position data_file
5907 -i ==> extract from the 'image' a specific 'data_file'
5908 -T ==> set image type to 'type'
5909 -p ==> 'position' (starting at 0) of the 'data_file' inside the 'image'
Guilherme Maciel Ferreiraa804b5c2013-12-01 12:43:11 -07005910
wdenkdb01a2e2004-04-15 23:14:49 +00005911
wdenk2729af92004-05-03 20:45:30 +00005912Installing a Linux Image:
5913-------------------------
wdenkdb01a2e2004-04-15 23:14:49 +00005914
wdenk2729af92004-05-03 20:45:30 +00005915To downloading a U-Boot image over the serial (console) interface,
5916you must convert the image to S-Record format:
wdenkdb01a2e2004-04-15 23:14:49 +00005917
wdenk2729af92004-05-03 20:45:30 +00005918 objcopy -I binary -O srec examples/image examples/image.srec
wdenkdb01a2e2004-04-15 23:14:49 +00005919
wdenk2729af92004-05-03 20:45:30 +00005920The 'objcopy' does not understand the information in the U-Boot
5921image header, so the resulting S-Record file will be relative to
5922address 0x00000000. To load it to a given address, you need to
5923specify the target address as 'offset' parameter with the 'loads'
5924command.
wdenkc6097192002-11-03 00:24:07 +00005925
wdenk2729af92004-05-03 20:45:30 +00005926Example: install the image to address 0x40100000 (which on the
5927TQM8xxL is in the first Flash bank):
wdenkc6097192002-11-03 00:24:07 +00005928
wdenk2729af92004-05-03 20:45:30 +00005929 => erase 40100000 401FFFFF
wdenkc6097192002-11-03 00:24:07 +00005930
wdenk2729af92004-05-03 20:45:30 +00005931 .......... done
5932 Erased 8 sectors
wdenkc6097192002-11-03 00:24:07 +00005933
wdenk2729af92004-05-03 20:45:30 +00005934 => loads 40100000
5935 ## Ready for S-Record download ...
5936 ~>examples/image.srec
5937 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
5938 ...
5939 15989 15990 15991 15992
5940 [file transfer complete]
5941 [connected]
5942 ## Start Addr = 0x00000000
wdenkc6097192002-11-03 00:24:07 +00005943
5944
wdenk2729af92004-05-03 20:45:30 +00005945You can check the success of the download using the 'iminfo' command;
Wolfgang Denk218ca722008-03-26 10:40:12 +01005946this includes a checksum verification so you can be sure no data
wdenk2729af92004-05-03 20:45:30 +00005947corruption happened:
wdenkc6097192002-11-03 00:24:07 +00005948
wdenk2729af92004-05-03 20:45:30 +00005949 => imi 40100000
wdenkc6097192002-11-03 00:24:07 +00005950
wdenk2729af92004-05-03 20:45:30 +00005951 ## Checking Image at 40100000 ...
5952 Image Name: 2.2.13 for initrd on TQM850L
5953 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5954 Data Size: 335725 Bytes = 327 kB = 0 MB
5955 Load Address: 00000000
5956 Entry Point: 0000000c
5957 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00005958
5959
wdenk2729af92004-05-03 20:45:30 +00005960Boot Linux:
5961-----------
wdenkc6097192002-11-03 00:24:07 +00005962
wdenk2729af92004-05-03 20:45:30 +00005963The "bootm" command is used to boot an application that is stored in
5964memory (RAM or Flash). In case of a Linux kernel image, the contents
5965of the "bootargs" environment variable is passed to the kernel as
5966parameters. You can check and modify this variable using the
5967"printenv" and "setenv" commands:
wdenkc6097192002-11-03 00:24:07 +00005968
5969
wdenk2729af92004-05-03 20:45:30 +00005970 => printenv bootargs
5971 bootargs=root=/dev/ram
wdenkc6097192002-11-03 00:24:07 +00005972
wdenk2729af92004-05-03 20:45:30 +00005973 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00005974
wdenk2729af92004-05-03 20:45:30 +00005975 => printenv bootargs
5976 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00005977
wdenk2729af92004-05-03 20:45:30 +00005978 => bootm 40020000
5979 ## Booting Linux kernel at 40020000 ...
5980 Image Name: 2.2.13 for NFS on TQM850L
5981 Image Type: PowerPC Linux Kernel Image (gzip compressed)
5982 Data Size: 381681 Bytes = 372 kB = 0 MB
5983 Load Address: 00000000
5984 Entry Point: 0000000c
5985 Verifying Checksum ... OK
5986 Uncompressing Kernel Image ... OK
5987 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
5988 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5989 time_init: decrementer frequency = 187500000/60
5990 Calibrating delay loop... 49.77 BogoMIPS
5991 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
5992 ...
wdenkc6097192002-11-03 00:24:07 +00005993
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02005994If you want to boot a Linux kernel with initial RAM disk, you pass
wdenk2729af92004-05-03 20:45:30 +00005995the memory addresses of both the kernel and the initrd image (PPBCOOT
5996format!) to the "bootm" command:
wdenkc6097192002-11-03 00:24:07 +00005997
wdenk2729af92004-05-03 20:45:30 +00005998 => imi 40100000 40200000
wdenkc6097192002-11-03 00:24:07 +00005999
wdenk2729af92004-05-03 20:45:30 +00006000 ## Checking Image at 40100000 ...
6001 Image Name: 2.2.13 for initrd on TQM850L
6002 Image Type: PowerPC Linux Kernel Image (gzip compressed)
6003 Data Size: 335725 Bytes = 327 kB = 0 MB
6004 Load Address: 00000000
6005 Entry Point: 0000000c
6006 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00006007
wdenk2729af92004-05-03 20:45:30 +00006008 ## Checking Image at 40200000 ...
6009 Image Name: Simple Ramdisk Image
6010 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
6011 Data Size: 566530 Bytes = 553 kB = 0 MB
6012 Load Address: 00000000
6013 Entry Point: 00000000
6014 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00006015
wdenk2729af92004-05-03 20:45:30 +00006016 => bootm 40100000 40200000
6017 ## Booting Linux kernel at 40100000 ...
6018 Image Name: 2.2.13 for initrd on TQM850L
6019 Image Type: PowerPC Linux Kernel Image (gzip compressed)
6020 Data Size: 335725 Bytes = 327 kB = 0 MB
6021 Load Address: 00000000
6022 Entry Point: 0000000c
6023 Verifying Checksum ... OK
6024 Uncompressing Kernel Image ... OK
6025 ## Loading RAMDisk Image at 40200000 ...
6026 Image Name: Simple Ramdisk Image
6027 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
6028 Data Size: 566530 Bytes = 553 kB = 0 MB
6029 Load Address: 00000000
6030 Entry Point: 00000000
6031 Verifying Checksum ... OK
6032 Loading Ramdisk ... OK
6033 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
6034 Boot arguments: root=/dev/ram
6035 time_init: decrementer frequency = 187500000/60
6036 Calibrating delay loop... 49.77 BogoMIPS
6037 ...
6038 RAMDISK: Compressed image found at block 0
6039 VFS: Mounted root (ext2 filesystem).
wdenkc6097192002-11-03 00:24:07 +00006040
wdenk2729af92004-05-03 20:45:30 +00006041 bash#
wdenkc6097192002-11-03 00:24:07 +00006042
Matthew McClintock02677682006-06-28 10:41:37 -05006043Boot Linux and pass a flat device tree:
6044-----------
6045
6046First, U-Boot must be compiled with the appropriate defines. See the section
6047titled "Linux Kernel Interface" above for a more in depth explanation. The
6048following is an example of how to start a kernel and pass an updated
6049flat device tree:
6050
6051=> print oftaddr
6052oftaddr=0x300000
6053=> print oft
6054oft=oftrees/mpc8540ads.dtb
6055=> tftp $oftaddr $oft
6056Speed: 1000, full duplex
6057Using TSEC0 device
6058TFTP from server 192.168.1.1; our IP address is 192.168.1.101
6059Filename 'oftrees/mpc8540ads.dtb'.
6060Load address: 0x300000
6061Loading: #
6062done
6063Bytes transferred = 4106 (100a hex)
6064=> tftp $loadaddr $bootfile
6065Speed: 1000, full duplex
6066Using TSEC0 device
6067TFTP from server 192.168.1.1; our IP address is 192.168.1.2
6068Filename 'uImage'.
6069Load address: 0x200000
6070Loading:############
6071done
6072Bytes transferred = 1029407 (fb51f hex)
6073=> print loadaddr
6074loadaddr=200000
6075=> print oftaddr
6076oftaddr=0x300000
6077=> bootm $loadaddr - $oftaddr
6078## Booting image at 00200000 ...
Wolfgang Denka9398e02006-11-27 15:32:42 +01006079 Image Name: Linux-2.6.17-dirty
6080 Image Type: PowerPC Linux Kernel Image (gzip compressed)
6081 Data Size: 1029343 Bytes = 1005.2 kB
Matthew McClintock02677682006-06-28 10:41:37 -05006082 Load Address: 00000000
Wolfgang Denka9398e02006-11-27 15:32:42 +01006083 Entry Point: 00000000
Matthew McClintock02677682006-06-28 10:41:37 -05006084 Verifying Checksum ... OK
6085 Uncompressing Kernel Image ... OK
6086Booting using flat device tree at 0x300000
6087Using MPC85xx ADS machine description
6088Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
6089[snip]
6090
6091
wdenk2729af92004-05-03 20:45:30 +00006092More About U-Boot Image Types:
6093------------------------------
wdenk6069ff22003-02-28 00:49:47 +00006094
wdenk2729af92004-05-03 20:45:30 +00006095U-Boot supports the following image types:
wdenk6069ff22003-02-28 00:49:47 +00006096
wdenk2729af92004-05-03 20:45:30 +00006097 "Standalone Programs" are directly runnable in the environment
6098 provided by U-Boot; it is expected that (if they behave
6099 well) you can continue to work in U-Boot after return from
6100 the Standalone Program.
6101 "OS Kernel Images" are usually images of some Embedded OS which
6102 will take over control completely. Usually these programs
6103 will install their own set of exception handlers, device
6104 drivers, set up the MMU, etc. - this means, that you cannot
6105 expect to re-enter U-Boot except by resetting the CPU.
6106 "RAMDisk Images" are more or less just data blocks, and their
6107 parameters (address, size) are passed to an OS kernel that is
6108 being started.
6109 "Multi-File Images" contain several images, typically an OS
6110 (Linux) kernel image and one or more data images like
6111 RAMDisks. This construct is useful for instance when you want
6112 to boot over the network using BOOTP etc., where the boot
6113 server provides just a single image file, but you want to get
6114 for instance an OS kernel and a RAMDisk image.
stroesec1551ea2003-04-04 15:53:41 +00006115
wdenk2729af92004-05-03 20:45:30 +00006116 "Multi-File Images" start with a list of image sizes, each
6117 image size (in bytes) specified by an "uint32_t" in network
6118 byte order. This list is terminated by an "(uint32_t)0".
6119 Immediately after the terminating 0 follow the images, one by
6120 one, all aligned on "uint32_t" boundaries (size rounded up to
6121 a multiple of 4 bytes).
stroesec1551ea2003-04-04 15:53:41 +00006122
wdenk2729af92004-05-03 20:45:30 +00006123 "Firmware Images" are binary images containing firmware (like
6124 U-Boot or FPGA images) which usually will be programmed to
6125 flash memory.
stroesec1551ea2003-04-04 15:53:41 +00006126
wdenk2729af92004-05-03 20:45:30 +00006127 "Script files" are command sequences that will be executed by
6128 U-Boot's command interpreter; this feature is especially
6129 useful when you configure U-Boot to use a real shell (hush)
6130 as command interpreter.
wdenk6069ff22003-02-28 00:49:47 +00006131
Marek Vasut44f074c2012-03-14 21:52:45 +00006132Booting the Linux zImage:
6133-------------------------
6134
6135On some platforms, it's possible to boot Linux zImage. This is done
6136using the "bootz" command. The syntax of "bootz" command is the same
6137as the syntax of "bootm" command.
6138
Tom Rini8ac28562013-05-16 11:40:11 -04006139Note, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
Marek Vasut017e1f32012-03-18 11:47:58 +00006140kernel with raw initrd images. The syntax is slightly different, the
6141address of the initrd must be augmented by it's size, in the following
6142format: "<initrd addres>:<initrd size>".
6143
wdenkc6097192002-11-03 00:24:07 +00006144
wdenk2729af92004-05-03 20:45:30 +00006145Standalone HOWTO:
6146=================
wdenkc6097192002-11-03 00:24:07 +00006147
wdenk2729af92004-05-03 20:45:30 +00006148One of the features of U-Boot is that you can dynamically load and
6149run "standalone" applications, which can use some resources of
6150U-Boot like console I/O functions or interrupt services.
wdenkc6097192002-11-03 00:24:07 +00006151
wdenk2729af92004-05-03 20:45:30 +00006152Two simple examples are included with the sources:
wdenkc6097192002-11-03 00:24:07 +00006153
wdenk2729af92004-05-03 20:45:30 +00006154"Hello World" Demo:
6155-------------------
wdenkc6097192002-11-03 00:24:07 +00006156
wdenk2729af92004-05-03 20:45:30 +00006157'examples/hello_world.c' contains a small "Hello World" Demo
6158application; it is automatically compiled when you build U-Boot.
6159It's configured to run at address 0x00040004, so you can play with it
6160like that:
wdenkc6097192002-11-03 00:24:07 +00006161
wdenk2729af92004-05-03 20:45:30 +00006162 => loads
6163 ## Ready for S-Record download ...
6164 ~>examples/hello_world.srec
6165 1 2 3 4 5 6 7 8 9 10 11 ...
6166 [file transfer complete]
6167 [connected]
6168 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00006169
wdenk2729af92004-05-03 20:45:30 +00006170 => go 40004 Hello World! This is a test.
6171 ## Starting application at 0x00040004 ...
6172 Hello World
6173 argc = 7
6174 argv[0] = "40004"
6175 argv[1] = "Hello"
6176 argv[2] = "World!"
6177 argv[3] = "This"
6178 argv[4] = "is"
6179 argv[5] = "a"
6180 argv[6] = "test."
6181 argv[7] = "<NULL>"
6182 Hit any key to exit ...
wdenkc6097192002-11-03 00:24:07 +00006183
wdenk2729af92004-05-03 20:45:30 +00006184 ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00006185
wdenk2729af92004-05-03 20:45:30 +00006186Another example, which demonstrates how to register a CPM interrupt
6187handler with the U-Boot code, can be found in 'examples/timer.c'.
6188Here, a CPM timer is set up to generate an interrupt every second.
6189The interrupt service routine is trivial, just printing a '.'
6190character, but this is just a demo program. The application can be
6191controlled by the following keys:
wdenkc6097192002-11-03 00:24:07 +00006192
wdenk2729af92004-05-03 20:45:30 +00006193 ? - print current values og the CPM Timer registers
6194 b - enable interrupts and start timer
6195 e - stop timer and disable interrupts
6196 q - quit application
wdenkc6097192002-11-03 00:24:07 +00006197
wdenk2729af92004-05-03 20:45:30 +00006198 => loads
6199 ## Ready for S-Record download ...
6200 ~>examples/timer.srec
6201 1 2 3 4 5 6 7 8 9 10 11 ...
6202 [file transfer complete]
6203 [connected]
6204 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00006205
wdenk2729af92004-05-03 20:45:30 +00006206 => go 40004
6207 ## Starting application at 0x00040004 ...
6208 TIMERS=0xfff00980
6209 Using timer 1
6210 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
wdenkc6097192002-11-03 00:24:07 +00006211
wdenk2729af92004-05-03 20:45:30 +00006212Hit 'b':
6213 [q, b, e, ?] Set interval 1000000 us
6214 Enabling timer
6215Hit '?':
6216 [q, b, e, ?] ........
6217 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
6218Hit '?':
6219 [q, b, e, ?] .
6220 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
6221Hit '?':
6222 [q, b, e, ?] .
6223 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
6224Hit '?':
6225 [q, b, e, ?] .
6226 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
6227Hit 'e':
6228 [q, b, e, ?] ...Stopping timer
6229Hit 'q':
6230 [q, b, e, ?] ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00006231
6232
wdenk2729af92004-05-03 20:45:30 +00006233Minicom warning:
6234================
wdenk85ec0bc2003-03-31 16:34:49 +00006235
wdenk2729af92004-05-03 20:45:30 +00006236Over time, many people have reported problems when trying to use the
6237"minicom" terminal emulation program for serial download. I (wd)
6238consider minicom to be broken, and recommend not to use it. Under
6239Unix, I recommend to use C-Kermit for general purpose use (and
6240especially for kermit binary protocol download ("loadb" command), and
Karl O. Pince53515a2012-10-01 05:11:56 +00006241use "cu" for S-Record download ("loads" command). See
6242http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
6243for help with kermit.
6244
wdenk85ec0bc2003-03-31 16:34:49 +00006245
wdenk2729af92004-05-03 20:45:30 +00006246Nevertheless, if you absolutely want to use it try adding this
6247configuration to your "File transfer protocols" section:
wdenk52f52c12003-06-19 23:04:19 +00006248
wdenk2729af92004-05-03 20:45:30 +00006249 Name Program Name U/D FullScr IO-Red. Multi
6250 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
6251 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
wdenk52f52c12003-06-19 23:04:19 +00006252
6253
wdenk2729af92004-05-03 20:45:30 +00006254NetBSD Notes:
6255=============
wdenkc6097192002-11-03 00:24:07 +00006256
wdenk2729af92004-05-03 20:45:30 +00006257Starting at version 0.9.2, U-Boot supports NetBSD both as host
6258(build U-Boot) and target system (boots NetBSD/mpc8xx).
wdenkc6097192002-11-03 00:24:07 +00006259
wdenk2729af92004-05-03 20:45:30 +00006260Building requires a cross environment; it is known to work on
6261NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
6262need gmake since the Makefiles are not compatible with BSD make).
6263Note that the cross-powerpc package does not install include files;
6264attempting to build U-Boot will fail because <machine/ansi.h> is
6265missing. This file has to be installed and patched manually:
wdenkc6097192002-11-03 00:24:07 +00006266
wdenk2729af92004-05-03 20:45:30 +00006267 # cd /usr/pkg/cross/powerpc-netbsd/include
6268 # mkdir powerpc
6269 # ln -s powerpc machine
6270 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
6271 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
wdenkc6097192002-11-03 00:24:07 +00006272
wdenk2729af92004-05-03 20:45:30 +00006273Native builds *don't* work due to incompatibilities between native
6274and U-Boot include files.
wdenkc6097192002-11-03 00:24:07 +00006275
wdenk2729af92004-05-03 20:45:30 +00006276Booting assumes that (the first part of) the image booted is a
6277stage-2 loader which in turn loads and then invokes the kernel
6278proper. Loader sources will eventually appear in the NetBSD source
6279tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
wdenk2a8af182005-04-13 10:02:42 +00006280meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
wdenkc6097192002-11-03 00:24:07 +00006281
6282
wdenk2729af92004-05-03 20:45:30 +00006283Implementation Internals:
6284=========================
wdenkc6097192002-11-03 00:24:07 +00006285
wdenk2729af92004-05-03 20:45:30 +00006286The following is not intended to be a complete description of every
6287implementation detail. However, it should help to understand the
6288inner workings of U-Boot and make it easier to port it to custom
6289hardware.
wdenkc6097192002-11-03 00:24:07 +00006290
6291
wdenk2729af92004-05-03 20:45:30 +00006292Initial Stack, Global Data:
6293---------------------------
wdenkc6097192002-11-03 00:24:07 +00006294
wdenk2729af92004-05-03 20:45:30 +00006295The implementation of U-Boot is complicated by the fact that U-Boot
6296starts running out of ROM (flash memory), usually without access to
6297system RAM (because the memory controller is not initialized yet).
6298This means that we don't have writable Data or BSS segments, and BSS
6299is not initialized as zero. To be able to get a C environment working
6300at all, we have to allocate at least a minimal stack. Implementation
6301options for this are defined and restricted by the CPU used: Some CPU
6302models provide on-chip memory (like the IMMR area on MPC8xx and
6303MPC826x processors), on others (parts of) the data cache can be
6304locked as (mis-) used as memory, etc.
wdenkc6097192002-11-03 00:24:07 +00006305
Wolfgang Denk218ca722008-03-26 10:40:12 +01006306 Chris Hallinan posted a good summary of these issues to the
Wolfgang Denk06682362008-12-30 22:56:11 +01006307 U-Boot mailing list:
wdenk43d96162003-03-06 00:02:04 +00006308
wdenk2729af92004-05-03 20:45:30 +00006309 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
6310 From: "Chris Hallinan" <clh@net1plus.com>
6311 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
6312 ...
wdenk43d96162003-03-06 00:02:04 +00006313
wdenk2729af92004-05-03 20:45:30 +00006314 Correct me if I'm wrong, folks, but the way I understand it
6315 is this: Using DCACHE as initial RAM for Stack, etc, does not
6316 require any physical RAM backing up the cache. The cleverness
6317 is that the cache is being used as a temporary supply of
6318 necessary storage before the SDRAM controller is setup. It's
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02006319 beyond the scope of this list to explain the details, but you
wdenk2729af92004-05-03 20:45:30 +00006320 can see how this works by studying the cache architecture and
6321 operation in the architecture and processor-specific manuals.
wdenk43d96162003-03-06 00:02:04 +00006322
wdenk2729af92004-05-03 20:45:30 +00006323 OCM is On Chip Memory, which I believe the 405GP has 4K. It
6324 is another option for the system designer to use as an
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02006325 initial stack/RAM area prior to SDRAM being available. Either
wdenk2729af92004-05-03 20:45:30 +00006326 option should work for you. Using CS 4 should be fine if your
6327 board designers haven't used it for something that would
6328 cause you grief during the initial boot! It is frequently not
6329 used.
wdenk43d96162003-03-06 00:02:04 +00006330
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02006331 CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
wdenk2729af92004-05-03 20:45:30 +00006332 with your processor/board/system design. The default value
6333 you will find in any recent u-boot distribution in
Stefan Roese8a316c92005-08-01 16:49:12 +02006334 walnut.h should work for you. I'd set it to a value larger
wdenk2729af92004-05-03 20:45:30 +00006335 than your SDRAM module. If you have a 64MB SDRAM module, set
6336 it above 400_0000. Just make sure your board has no resources
6337 that are supposed to respond to that address! That code in
6338 start.S has been around a while and should work as is when
6339 you get the config right.
wdenk43d96162003-03-06 00:02:04 +00006340
wdenk2729af92004-05-03 20:45:30 +00006341 -Chris Hallinan
6342 DS4.COM, Inc.
wdenk43d96162003-03-06 00:02:04 +00006343
wdenk2729af92004-05-03 20:45:30 +00006344It is essential to remember this, since it has some impact on the C
6345code for the initialization procedures:
wdenkc6097192002-11-03 00:24:07 +00006346
wdenk2729af92004-05-03 20:45:30 +00006347* Initialized global data (data segment) is read-only. Do not attempt
6348 to write it.
wdenkc6097192002-11-03 00:24:07 +00006349
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08006350* Do not use any uninitialized global data (or implicitly initialized
wdenk2729af92004-05-03 20:45:30 +00006351 as zero data - BSS segment) at all - this is undefined, initiali-
6352 zation is performed later (when relocating to RAM).
wdenkc6097192002-11-03 00:24:07 +00006353
wdenk2729af92004-05-03 20:45:30 +00006354* Stack space is very limited. Avoid big data buffers or things like
6355 that.
wdenkc6097192002-11-03 00:24:07 +00006356
wdenk2729af92004-05-03 20:45:30 +00006357Having only the stack as writable memory limits means we cannot use
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08006358normal global data to share information between the code. But it
wdenk2729af92004-05-03 20:45:30 +00006359turned out that the implementation of U-Boot can be greatly
6360simplified by making a global data structure (gd_t) available to all
6361functions. We could pass a pointer to this data as argument to _all_
6362functions, but this would bloat the code. Instead we use a feature of
6363the GCC compiler (Global Register Variables) to share the data: we
6364place a pointer (gd) to the global data into a register which we
6365reserve for this purpose.
wdenkc6097192002-11-03 00:24:07 +00006366
wdenk2729af92004-05-03 20:45:30 +00006367When choosing a register for such a purpose we are restricted by the
6368relevant (E)ABI specifications for the current architecture, and by
6369GCC's implementation.
wdenkc6097192002-11-03 00:24:07 +00006370
wdenk2729af92004-05-03 20:45:30 +00006371For PowerPC, the following registers have specific use:
6372 R1: stack pointer
Wolfgang Denke7670f62008-02-14 22:43:22 +01006373 R2: reserved for system use
wdenk2729af92004-05-03 20:45:30 +00006374 R3-R4: parameter passing and return values
6375 R5-R10: parameter passing
6376 R13: small data area pointer
6377 R30: GOT pointer
6378 R31: frame pointer
wdenkc6097192002-11-03 00:24:07 +00006379
Joakim Tjernlunde6bee802010-01-19 14:41:58 +01006380 (U-Boot also uses R12 as internal GOT pointer. r12
6381 is a volatile register so r12 needs to be reset when
6382 going back and forth between asm and C)
wdenkc6097192002-11-03 00:24:07 +00006383
Wolfgang Denke7670f62008-02-14 22:43:22 +01006384 ==> U-Boot will use R2 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00006385
wdenk2729af92004-05-03 20:45:30 +00006386 Note: on PPC, we could use a static initializer (since the
6387 address of the global data structure is known at compile time),
6388 but it turned out that reserving a register results in somewhat
6389 smaller code - although the code savings are not that big (on
6390 average for all boards 752 bytes for the whole U-Boot image,
6391 624 text + 127 data).
wdenkc6097192002-11-03 00:24:07 +00006392
Robin Getzc4db3352009-08-17 15:23:02 +00006393On Blackfin, the normal C ABI (except for P3) is followed as documented here:
Mike Frysinger4c58eb52008-02-04 19:26:54 -05006394 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
6395
Robin Getzc4db3352009-08-17 15:23:02 +00006396 ==> U-Boot will use P3 to hold a pointer to the global data
Mike Frysinger4c58eb52008-02-04 19:26:54 -05006397
wdenk2729af92004-05-03 20:45:30 +00006398On ARM, the following registers are used:
wdenkc6097192002-11-03 00:24:07 +00006399
wdenk2729af92004-05-03 20:45:30 +00006400 R0: function argument word/integer result
6401 R1-R3: function argument word
Jeroen Hofstee12eba1b2013-09-21 14:04:42 +02006402 R9: platform specific
6403 R10: stack limit (used only if stack checking is enabled)
wdenk2729af92004-05-03 20:45:30 +00006404 R11: argument (frame) pointer
6405 R12: temporary workspace
6406 R13: stack pointer
6407 R14: link register
6408 R15: program counter
wdenkc6097192002-11-03 00:24:07 +00006409
Jeroen Hofstee12eba1b2013-09-21 14:04:42 +02006410 ==> U-Boot will use R9 to hold a pointer to the global data
6411
6412 Note: on ARM, only R_ARM_RELATIVE relocations are supported.
wdenkc6097192002-11-03 00:24:07 +00006413
Thomas Chou0df01fd32010-05-21 11:08:03 +08006414On Nios II, the ABI is documented here:
6415 http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
6416
6417 ==> U-Boot will use gp to hold a pointer to the global data
6418
6419 Note: on Nios II, we give "-G0" option to gcc and don't use gp
6420 to access small data sections, so gp is free.
6421
Macpaul Linafc1ce82011-10-19 20:41:11 +00006422On NDS32, the following registers are used:
6423
6424 R0-R1: argument/return
6425 R2-R5: argument
6426 R15: temporary register for assembler
6427 R16: trampoline register
6428 R28: frame pointer (FP)
6429 R29: global pointer (GP)
6430 R30: link register (LP)
6431 R31: stack pointer (SP)
6432 PC: program counter (PC)
6433
6434 ==> U-Boot will use R10 to hold a pointer to the global data
6435
Wolfgang Denkd87080b2006-03-31 18:32:53 +02006436NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
6437or current versions of GCC may "optimize" the code too much.
wdenkc6097192002-11-03 00:24:07 +00006438
wdenk2729af92004-05-03 20:45:30 +00006439Memory Management:
6440------------------
wdenkc6097192002-11-03 00:24:07 +00006441
wdenk2729af92004-05-03 20:45:30 +00006442U-Boot runs in system state and uses physical addresses, i.e. the
6443MMU is not used either for address mapping nor for memory protection.
wdenkc6097192002-11-03 00:24:07 +00006444
wdenk2729af92004-05-03 20:45:30 +00006445The available memory is mapped to fixed addresses using the memory
6446controller. In this process, a contiguous block is formed for each
6447memory type (Flash, SDRAM, SRAM), even when it consists of several
6448physical memory banks.
wdenkc6097192002-11-03 00:24:07 +00006449
wdenk2729af92004-05-03 20:45:30 +00006450U-Boot is installed in the first 128 kB of the first Flash bank (on
6451TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
6452booting and sizing and initializing DRAM, the code relocates itself
6453to the upper end of DRAM. Immediately below the U-Boot code some
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02006454memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
wdenk2729af92004-05-03 20:45:30 +00006455configuration setting]. Below that, a structure with global Board
6456Info data is placed, followed by the stack (growing downward).
wdenkc6097192002-11-03 00:24:07 +00006457
wdenk2729af92004-05-03 20:45:30 +00006458Additionally, some exception handler code is copied to the low 8 kB
6459of DRAM (0x00000000 ... 0x00001FFF).
wdenkc6097192002-11-03 00:24:07 +00006460
wdenk2729af92004-05-03 20:45:30 +00006461So a typical memory configuration with 16 MB of DRAM could look like
6462this:
wdenkc6097192002-11-03 00:24:07 +00006463
wdenk2729af92004-05-03 20:45:30 +00006464 0x0000 0000 Exception Vector code
6465 :
6466 0x0000 1FFF
6467 0x0000 2000 Free for Application Use
6468 :
6469 :
wdenkc6097192002-11-03 00:24:07 +00006470
wdenk2729af92004-05-03 20:45:30 +00006471 :
6472 :
6473 0x00FB FF20 Monitor Stack (Growing downward)
6474 0x00FB FFAC Board Info Data and permanent copy of global data
6475 0x00FC 0000 Malloc Arena
6476 :
6477 0x00FD FFFF
6478 0x00FE 0000 RAM Copy of Monitor Code
6479 ... eventually: LCD or video framebuffer
6480 ... eventually: pRAM (Protected RAM - unchanged by reset)
6481 0x00FF FFFF [End of RAM]
wdenkc6097192002-11-03 00:24:07 +00006482
6483
wdenk2729af92004-05-03 20:45:30 +00006484System Initialization:
6485----------------------
wdenkc6097192002-11-03 00:24:07 +00006486
wdenk2729af92004-05-03 20:45:30 +00006487In the reset configuration, U-Boot starts at the reset entry point
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02006488(on most PowerPC systems at address 0x00000100). Because of the reset
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08006489configuration for CS0# this is a mirror of the on board Flash memory.
wdenk2729af92004-05-03 20:45:30 +00006490To be able to re-map memory U-Boot then jumps to its link address.
6491To be able to implement the initialization code in C, a (small!)
6492initial stack is set up in the internal Dual Ported RAM (in case CPUs
6493which provide such a feature like MPC8xx or MPC8260), or in a locked
6494part of the data cache. After that, U-Boot initializes the CPU core,
6495the caches and the SIU.
wdenkc6097192002-11-03 00:24:07 +00006496
wdenk2729af92004-05-03 20:45:30 +00006497Next, all (potentially) available memory banks are mapped using a
6498preliminary mapping. For example, we put them on 512 MB boundaries
6499(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
6500on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
6501programmed for SDRAM access. Using the temporary configuration, a
6502simple memory test is run that determines the size of the SDRAM
6503banks.
wdenkc6097192002-11-03 00:24:07 +00006504
wdenk2729af92004-05-03 20:45:30 +00006505When there is more than one SDRAM bank, and the banks are of
6506different size, the largest is mapped first. For equal size, the first
6507bank (CS2#) is mapped first. The first mapping is always for address
65080x00000000, with any additional banks following immediately to create
6509contiguous memory starting from 0.
wdenkc6097192002-11-03 00:24:07 +00006510
wdenk2729af92004-05-03 20:45:30 +00006511Then, the monitor installs itself at the upper end of the SDRAM area
6512and allocates memory for use by malloc() and for the global Board
6513Info data; also, the exception vector code is copied to the low RAM
6514pages, and the final stack is set up.
wdenkc6097192002-11-03 00:24:07 +00006515
wdenk2729af92004-05-03 20:45:30 +00006516Only after this relocation will you have a "normal" C environment;
6517until that you are restricted in several ways, mostly because you are
6518running from ROM, and because the code will have to be relocated to a
6519new address in RAM.
wdenkc6097192002-11-03 00:24:07 +00006520
6521
wdenk2729af92004-05-03 20:45:30 +00006522U-Boot Porting Guide:
6523----------------------
wdenkc6097192002-11-03 00:24:07 +00006524
wdenk2729af92004-05-03 20:45:30 +00006525[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
6526list, October 2002]
wdenkc6097192002-11-03 00:24:07 +00006527
6528
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006529int main(int argc, char *argv[])
wdenk2729af92004-05-03 20:45:30 +00006530{
6531 sighandler_t no_more_time;
wdenkc6097192002-11-03 00:24:07 +00006532
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006533 signal(SIGALRM, no_more_time);
6534 alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
wdenkc6097192002-11-03 00:24:07 +00006535
wdenk2729af92004-05-03 20:45:30 +00006536 if (available_money > available_manpower) {
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006537 Pay consultant to port U-Boot;
wdenkc6097192002-11-03 00:24:07 +00006538 return 0;
6539 }
6540
wdenk2729af92004-05-03 20:45:30 +00006541 Download latest U-Boot source;
6542
Wolfgang Denk06682362008-12-30 22:56:11 +01006543 Subscribe to u-boot mailing list;
wdenk2729af92004-05-03 20:45:30 +00006544
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006545 if (clueless)
6546 email("Hi, I am new to U-Boot, how do I get started?");
wdenkc6097192002-11-03 00:24:07 +00006547
wdenk2729af92004-05-03 20:45:30 +00006548 while (learning) {
6549 Read the README file in the top level directory;
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006550 Read http://www.denx.de/twiki/bin/view/DULG/Manual;
6551 Read applicable doc/*.README;
wdenk2729af92004-05-03 20:45:30 +00006552 Read the source, Luke;
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006553 /* find . -name "*.[chS]" | xargs grep -i <keyword> */
wdenk2729af92004-05-03 20:45:30 +00006554 }
wdenkc6097192002-11-03 00:24:07 +00006555
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006556 if (available_money > toLocalCurrency ($2500))
6557 Buy a BDI3000;
6558 else
wdenk2729af92004-05-03 20:45:30 +00006559 Add a lot of aggravation and time;
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006560
6561 if (a similar board exists) { /* hopefully... */
6562 cp -a board/<similar> board/<myboard>
6563 cp include/configs/<similar>.h include/configs/<myboard>.h
6564 } else {
6565 Create your own board support subdirectory;
6566 Create your own board include/configs/<myboard>.h file;
wdenk2729af92004-05-03 20:45:30 +00006567 }
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006568 Edit new board/<myboard> files
6569 Edit new include/configs/<myboard>.h
wdenkc6097192002-11-03 00:24:07 +00006570
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04006571 while (!accepted) {
6572 while (!running) {
6573 do {
6574 Add / modify source code;
6575 } until (compiles);
6576 Debug;
6577 if (clueless)
6578 email("Hi, I am having problems...");
6579 }
6580 Send patch file to the U-Boot email list;
6581 if (reasonable critiques)
6582 Incorporate improvements from email list code review;
6583 else
6584 Defend code as written;
wdenk2729af92004-05-03 20:45:30 +00006585 }
wdenkc6097192002-11-03 00:24:07 +00006586
wdenk2729af92004-05-03 20:45:30 +00006587 return 0;
6588}
6589
6590void no_more_time (int sig)
6591{
6592 hire_a_guru();
6593}
wdenkc6097192002-11-03 00:24:07 +00006594
6595
wdenk2729af92004-05-03 20:45:30 +00006596Coding Standards:
6597-----------------
wdenkc6097192002-11-03 00:24:07 +00006598
wdenk2729af92004-05-03 20:45:30 +00006599All contributions to U-Boot should conform to the Linux kernel
Detlev Zundel2c051652006-09-01 15:39:02 +02006600coding style; see the file "Documentation/CodingStyle" and the script
Wolfgang Denk7ca92962011-07-27 10:59:55 +00006601"scripts/Lindent" in your Linux kernel source directory.
wdenk2729af92004-05-03 20:45:30 +00006602
Detlev Zundel2c051652006-09-01 15:39:02 +02006603Source files originating from a different project (for example the
6604MTD subsystem) are generally exempt from these guidelines and are not
Jeremiah Mahlerb445bbb2015-01-04 18:56:50 -08006605reformatted to ease subsequent migration to newer versions of those
Detlev Zundel2c051652006-09-01 15:39:02 +02006606sources.
6607
6608Please note that U-Boot is implemented in C (and to some small parts in
6609Assembler); no C++ is used, so please do not use C++ style comments (//)
6610in your code.
wdenk2729af92004-05-03 20:45:30 +00006611
6612Please also stick to the following formatting rules:
6613- remove any trailing white space
Wolfgang Denk7ca92962011-07-27 10:59:55 +00006614- use TAB characters for indentation and vertical alignment, not spaces
wdenk2729af92004-05-03 20:45:30 +00006615- make sure NOT to use DOS '\r\n' line feeds
Wolfgang Denk7ca92962011-07-27 10:59:55 +00006616- do not add more than 2 consecutive empty lines to source files
wdenk2729af92004-05-03 20:45:30 +00006617- do not add trailing empty lines to source files
6618
6619Submissions which do not conform to the standards may be returned
6620with a request to reformat the changes.
wdenkc6097192002-11-03 00:24:07 +00006621
6622
wdenk2729af92004-05-03 20:45:30 +00006623Submitting Patches:
6624-------------------
wdenkc6097192002-11-03 00:24:07 +00006625
wdenk2729af92004-05-03 20:45:30 +00006626Since the number of patches for U-Boot is growing, we need to
6627establish some rules. Submissions which do not conform to these rules
6628may be rejected, even when they contain important and valuable stuff.
wdenkc6097192002-11-03 00:24:07 +00006629
Magnus Lilja0d28f342008-08-06 19:32:33 +02006630Please see http://www.denx.de/wiki/U-Boot/Patches for details.
Wolfgang Denk218ca722008-03-26 10:40:12 +01006631
Wolfgang Denk06682362008-12-30 22:56:11 +01006632Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
6633see http://lists.denx.de/mailman/listinfo/u-boot
6634
wdenk2729af92004-05-03 20:45:30 +00006635When you send a patch, please include the following information with
6636it:
wdenkc6097192002-11-03 00:24:07 +00006637
wdenk2729af92004-05-03 20:45:30 +00006638* For bug fixes: a description of the bug and how your patch fixes
6639 this bug. Please try to include a way of demonstrating that the
6640 patch actually fixes something.
wdenkc6097192002-11-03 00:24:07 +00006641
wdenk2729af92004-05-03 20:45:30 +00006642* For new features: a description of the feature and your
6643 implementation.
wdenkc6097192002-11-03 00:24:07 +00006644
wdenk2729af92004-05-03 20:45:30 +00006645* A CHANGELOG entry as plaintext (separate from the patch)
6646
6647* For major contributions, your entry to the CREDITS file
6648
Albert ARIBAUD27af9302013-09-11 15:52:51 +02006649* When you add support for a new board, don't forget to add a
6650 maintainer e-mail address to the boards.cfg file, too.
wdenk2729af92004-05-03 20:45:30 +00006651
6652* If your patch adds new configuration options, don't forget to
6653 document these in the README file.
6654
Wolfgang Denk218ca722008-03-26 10:40:12 +01006655* The patch itself. If you are using git (which is *strongly*
6656 recommended) you can easily generate the patch using the
Wolfgang Denk7ca92962011-07-27 10:59:55 +00006657 "git format-patch". If you then use "git send-email" to send it to
Wolfgang Denk218ca722008-03-26 10:40:12 +01006658 the U-Boot mailing list, you will avoid most of the common problems
6659 with some other mail clients.
wdenk2729af92004-05-03 20:45:30 +00006660
Wolfgang Denk218ca722008-03-26 10:40:12 +01006661 If you cannot use git, use "diff -purN OLD NEW". If your version of
6662 diff does not support these options, then get the latest version of
6663 GNU diff.
wdenk2729af92004-05-03 20:45:30 +00006664
Wolfgang Denk218ca722008-03-26 10:40:12 +01006665 The current directory when running this command shall be the parent
6666 directory of the U-Boot source tree (i. e. please make sure that
6667 your patch includes sufficient directory information for the
6668 affected files).
6669
6670 We prefer patches as plain text. MIME attachments are discouraged,
6671 and compressed attachments must not be used.
wdenk2729af92004-05-03 20:45:30 +00006672
6673* If one logical set of modifications affects or creates several
6674 files, all these changes shall be submitted in a SINGLE patch file.
6675
6676* Changesets that contain different, unrelated modifications shall be
6677 submitted as SEPARATE patches, one patch per changeset.
6678
6679
6680Notes:
6681
6682* Before sending the patch, run the MAKEALL script on your patched
6683 source tree and make sure that no errors or warnings are reported
6684 for any of the boards.
6685
6686* Keep your modifications to the necessary minimum: A patch
6687 containing several unrelated changes or arbitrary reformats will be
6688 returned with a request to re-formatting / split it.
6689
6690* If you modify existing code, make sure that your new code does not
6691 add to the memory footprint of the code ;-) Small is beautiful!
6692 When adding new features, these should compile conditionally only
6693 (using #ifdef), and the resulting code with the new feature
6694 disabled must not need more memory than the old code without your
6695 modification.
wdenk90dc6702005-05-03 14:12:25 +00006696
Wolfgang Denk06682362008-12-30 22:56:11 +01006697* Remember that there is a size limit of 100 kB per message on the
6698 u-boot mailing list. Bigger patches will be moderated. If they are
6699 reasonable and not too big, they will be acknowledged. But patches
6700 bigger than the size limit should be avoided.