* Patch by Daniel Engström, 13 Nov 2002:
Add support for i386 architecture and AMD SC520 board
* Patch by Pierre Aubert, 12 Nov 2002:
Add support for DOS filesystem and booting from DOS floppy disk
diff --git a/lib_i386/board.c b/lib_i386/board.c
new file mode 100644
index 0000000..193860a
--- /dev/null
+++ b/lib_i386/board.c
@@ -0,0 +1,448 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
+ *
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <devices.h>
+#include <version.h>
+#include <malloc.h>
+#include <syscall.h>
+#include <net.h>
+#include <ide.h>
+
+extern long _i386boot_start;
+extern long _i386boot_end;
+extern long _i386boot_romdata_start;
+extern long _i386boot_romdata_dest;
+extern long _i386boot_romdata_size;
+extern long _i386boot_bss_start;
+extern long _i386boot_bss_size;
+
+extern long _i386boot_realmode;
+extern long _i386boot_realmode_size;
+extern long _i386boot_bios;
+extern long _i386boot_bios_size;
+
+/* The symbols defined by the linker script becomes pointers
+ * which is somewhat inconveient ... */
+ulong i386boot_start = (ulong)&_i386boot_start; /* code start (in flash) defined in start.S */
+ulong i386boot_end = (ulong)&_i386boot_end; /* code end (in flash) */
+ulong i386boot_romdata_start = (ulong)&_i386boot_romdata_start; /* datasegment in flash (also code+rodata end) */
+ulong i386boot_romdata_dest = (ulong)&_i386boot_romdata_dest; /* data location segment in ram */
+ulong i386boot_romdata_size = (ulong)&_i386boot_romdata_size; /* size of data segment */
+ulong i386boot_bss_start = (ulong)&_i386boot_bss_start; /* bss start */
+ulong i386boot_bss_size = (ulong)&_i386boot_bss_size; /* bss size */
+
+ulong i386boot_realmode = (ulong)&_i386boot_realmode; /* start of realmode entry code */
+ulong i386boot_realmode_size = (ulong)&_i386boot_realmode_size; /* size of realmode entry code */
+ulong i386boot_bios = (ulong)&_i386boot_bios; /* start of BIOS emulation code */
+ulong i386boot_bios_size = (ulong)&_i386boot_bios_size; /* size of BIOS emulation code */
+
+
+const char version_string[] =
+ U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
+
+
+/*
+ * Begin and End of memory area for malloc(), and current "brk"
+ */
+static ulong mem_malloc_start = 0;
+static ulong mem_malloc_end = 0;
+static ulong mem_malloc_brk = 0;
+
+static int mem_malloc_init(void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+
+#if 1
+ /* start malloc area right after the stack */
+ mem_malloc_start = i386boot_bss_start +
+ i386boot_bss_size + CFG_STACK_SIZE;
+ mem_malloc_start = (mem_malloc_start+3)&~3;
+#else
+ mem_malloc_start = 0x400000;
+#endif
+#if 1
+ /* Use all available RAM for malloc() */
+ mem_malloc_end = gd->ram_size;
+#else
+ /* Use only CONFIG_MALLOC_SIZE bytes of RAM for malloc() */
+ mem_malloc_end = mem_malloc_start + CONFIG_MALLOC_SIZE;
+#endif
+ mem_malloc_brk = mem_malloc_start;
+
+ return 0;
+}
+
+void *sbrk (ptrdiff_t increment)
+{
+ ulong old = mem_malloc_brk;
+ ulong new = old + increment;
+
+ if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
+ return (NULL);
+ }
+ mem_malloc_brk = new;
+
+ return ((void *) old);
+}
+
+char *strmhz (char *buf, long hz)
+{
+ long l, n;
+ long m;
+
+ n = hz / 1000000L;
+ l = sprintf (buf, "%ld", n);
+ m = (hz % 1000000L) / 1000L;
+ if (m != 0)
+ sprintf (buf + l, ".%03ld", m);
+ return (buf);
+}
+
+/************************************************************************
+ * Init Utilities *
+ ************************************************************************
+ * Some of this code should be moved into the core functions,
+ * or dropped completely,
+ * but let's get it working (again) first...
+ */
+static void syscalls_init (void)
+{
+ syscall_tbl[SYSCALL_MALLOC] = (void *) malloc;
+ syscall_tbl[SYSCALL_FREE] = (void *) free;
+
+ syscall_tbl[SYSCALL_INSTALL_HDLR] = (void *) irq_install_handler;
+ syscall_tbl[SYSCALL_FREE_HDLR] = (void *) irq_free_handler;
+
+}
+
+static int init_baudrate (void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+
+ uchar tmp[64]; /* long enough for environment variables */
+ int i = getenv_r ("baudrate", tmp, sizeof (tmp));
+
+ gd->baudrate = (i > 0)
+ ? (int) simple_strtoul (tmp, NULL, 10)
+ : CONFIG_BAUDRATE;
+
+ return (0);
+}
+
+static int display_banner (void)
+{
+
+ printf ("\n\n%s\n\n", version_string);
+ printf ("U-Boot code: %08lX -> %08lX data: %08lX -> %08lX\n"
+ " BSS: %08lX -> %08lX stack: %08lX -> %08lX\n",
+ i386boot_start, i386boot_romdata_start-1,
+ i386boot_romdata_dest, i386boot_romdata_dest+i386boot_romdata_size-1,
+ i386boot_bss_start, i386boot_bss_start+i386boot_bss_size-1,
+ i386boot_bss_start+i386boot_bss_size,
+ i386boot_bss_start+i386boot_bss_size+CFG_STACK_SIZE-1);
+
+
+ return (0);
+}
+
+/*
+ * WARNING: this code looks "cleaner" than the PowerPC version, but
+ * has the disadvantage that you either get nothing, or everything.
+ * On PowerPC, you might see "DRAM: " before the system hangs - which
+ * gives a simple yet clear indication which part of the
+ * initialization if failing.
+ */
+static int display_dram_config (void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+ int i;
+
+ puts ("DRAM Configuration:\n");
+
+ for (i=0; i<CONFIG_NR_DRAM_BANKS; i++) {
+ printf ("Bank #%d: %08lx ", i, gd->bd->bi_dram[i].start);
+ print_size (gd->bd->bi_dram[i].size, "\n");
+ }
+
+ return (0);
+}
+
+static void display_flash_config (ulong size)
+{
+ puts ("Flash: ");
+ print_size (size, "\n");
+}
+
+
+
+/*
+ * Breath some life into the board...
+ *
+ * Initialize an SMC for serial comms, and carry out some hardware
+ * tests.
+ *
+ * The first part of initialization is running from Flash memory;
+ * its main purpose is to initialize the RAM so that we
+ * can relocate the monitor code to RAM.
+ */
+
+/*
+ * All attempts to come up with a "common" initialization sequence
+ * that works for all boards and architectures failed: some of the
+ * requirements are just _too_ different. To get rid of the resulting
+ * mess of board dependend #ifdef'ed code we now make the whole
+ * initialization sequence configurable to the user.
+ *
+ * The requirements for any new initalization function is simple: it
+ * receives a pointer to the "global data" structure as it's only
+ * argument, and returns an integer return code, where 0 means
+ * "continue" and != 0 means "fatal error, hang the system".
+ */
+typedef int (init_fnc_t) (void);
+
+init_fnc_t *init_sequence[] = {
+ cpu_init, /* basic cpu dependent setup */
+ board_init, /* basic board dependent setup */
+ dram_init, /* configure available RAM banks */
+ mem_malloc_init, /* dependant on dram_init */
+ interrupt_init, /* set up exceptions */
+ timer_init,
+ env_init, /* initialize environment */
+ init_baudrate, /* initialze baudrate settings */
+ serial_init, /* serial communications setup */
+ display_banner,
+ display_dram_config,
+
+ NULL,
+};
+
+gd_t *global_data;
+
+void start_i386boot (void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+ char *s;
+ int i;
+ ulong size;
+ static gd_t gd_data;
+ static bd_t bd_data;
+ init_fnc_t **init_fnc_ptr;
+
+ show_boot_progress(0x21);
+
+ gd = global_data = &gd_data;
+
+ memset (gd, 0, sizeof (gd_t));
+ gd->bd = &bd_data;
+ memset (gd->bd, 0, sizeof (bd_t));
+ show_boot_progress(0x22);
+
+
+ for (init_fnc_ptr = init_sequence, i=0; *init_fnc_ptr; ++init_fnc_ptr, i++) {
+ show_boot_progress(0xa130|i);
+
+ if ((*init_fnc_ptr)() != 0) {
+ hang ();
+ }
+ }
+ show_boot_progress(0x23);
+
+ /* configure available FLASH banks */
+ size = flash_init();
+ display_flash_config(size);
+ show_boot_progress(0x24);
+
+ show_boot_progress(0x25);
+
+ /* initialize environment */
+ env_relocate ();
+ show_boot_progress(0x26);
+
+
+ /* IP Address */
+ bd_data.bi_ip_addr = getenv_IPaddr ("ipaddr");
+
+ /* MAC Address */
+ {
+ int i;
+ ulong reg;
+ char *s, *e;
+ uchar tmp[64];
+
+ i = getenv_r ("ethaddr", tmp, sizeof (tmp));
+ s = (i > 0) ? tmp : NULL;
+
+ for (reg = 0; reg < 6; ++reg) {
+ bd_data.bi_enetaddr[reg] = s ? simple_strtoul (s, &e, 16) : 0;
+ if (s)
+ s = (*e) ? e + 1 : e;
+ }
+ }
+
+#if defined(CONFIG_PCI)
+ /*
+ * Do pci configuration
+ */
+ pci_init();
+#endif
+
+ show_boot_progress(0x27);
+
+
+ devices_init ();
+
+ /* allocate syscalls table (console_init_r will fill it in */
+ syscall_tbl = (void **) malloc (NR_SYSCALLS * sizeof (void *));
+
+ /* Initialize the console (after the relocation and devices init) */
+ console_init_r();
+ syscalls_init();
+
+#ifdef CONFIG_MISC_INIT_R
+ /* miscellaneous platform dependent initialisations */
+ misc_init_r();
+#endif
+
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET) && (0)
+ WATCHDOG_RESET();
+# ifdef DEBUG
+ puts ("Reset Ethernet PHY\n");
+# endif
+ reset_phy();
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_PCMCIA) && !(CONFIG_COMMANDS & CFG_CMD_IDE)
+ WATCHDOG_RESET();
+ puts ("PCMCIA:");
+ pcmcia_init();
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+ WATCHDOG_RESET();
+ puts("KGDB: ");
+ kgdb_init();
+#endif
+
+ /* enable exceptions */
+ enable_interrupts ();
+ show_boot_progress(0x28);
+
+ /* Must happen after interrupts are initialized since
+ * an irq handler gets installed
+ */
+#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
+ serial_buffered_init();
+#endif
+
+#ifdef CONFIG_STATUS_LED
+ status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING);
+#endif
+
+ udelay (20);
+
+ set_timer (0);
+
+ /* Initialize from environment */
+ if ((s = getenv ("loadaddr")) != NULL) {
+ load_addr = simple_strtoul (s, NULL, 16);
+ }
+#if (CONFIG_COMMANDS & CFG_CMD_NET)
+ if ((s = getenv ("bootfile")) != NULL) {
+ copy_filename (BootFile, s, sizeof (BootFile));
+ }
+#endif /* CFG_CMD_NET */
+
+ WATCHDOG_RESET();
+
+#if (CONFIG_COMMANDS & CFG_CMD_IDE)
+ WATCHDOG_RESET();
+ puts("IDE: ");
+ ide_init();
+#endif /* CFG_CMD_IDE */
+
+#if (CONFIG_COMMANDS & CFG_CMD_SCSI)
+ WATCHDOG_RESET();
+ puts("SCSI: ");
+ scsi_init();
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_DOC)
+ WATCHDOG_RESET();
+ puts ("DOC: ");
+ doc_init();
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI)
+ WATCHDOG_RESET();
+ puts("Net: ");
+ eth_initialize(gd->bd);
+#endif
+
+#ifdef CONFIG_LAST_STAGE_INIT
+ WATCHDOG_RESET();
+ /*
+ * Some parts can be only initialized if all others (like
+ * Interrupts) are up and running (i.e. the PC-style ISA
+ * keyboard).
+ */
+ last_stage_init();
+#endif
+
+
+
+#ifdef CONFIG_POST
+ post_run (NULL, POST_RAM | post_bootmode_get(0));
+ if (post_bootmode_get(0) & POST_POWERFAIL) {
+ post_bootmode_clear();
+ board_poweroff();
+ }
+#endif
+
+ show_boot_progress(0x29);
+
+ /* main_loop() can return to retry autoboot, if so just run it again. */
+ for (;;) {
+ main_loop ();
+ }
+
+ /* NOTREACHED - no way out of command loop except booting */
+}
+
+void hang (void)
+{
+ puts ("### ERROR ### Please RESET the board ###\n");
+ for (;;);
+}
+
+