sbc8548: enable ability to boot from alternate flash
This board has an 8MB soldered on flash, and a 64MB SODIMM
flash module. Normally the board boots from the 8MB flash,
but the hardware can be configured for booting from the 64MB
flash as well by swapping CS0 and CS6. This can be handy
for recovery purposes, or for supporting u-boot and VxBoot
at the same time.
To support this in u-boot, we need to have different BR0/OR0
and BR6/OR6 settings in place for when the board is configured
in this way, and a different TEXT_BASE needs to be used due
to the larger sector size of the 64MB flash module.
We introduce the suffix _8M and _64M for the BR0/BR6 and the
OR0/OR6 values so it is clear which is being used to map what
specific device.
The larger sector size (512k) of the alternate flash needs
a larger malloc pool, otherwise you'll get failures when
running saveenv, so bump it up accordingly.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/board/sbc8548/law.c b/board/sbc8548/law.c
index febb682..c263191 100644
--- a/board/sbc8548/law.c
+++ b/board/sbc8548/law.c
@@ -41,13 +41,21 @@
* 0xf8b0_0000 0xf80f_ffff EEPROM 1M
* 0xff80_0000 0xffff_ffff FLASH (boot bank) 8M
*
+ * If swapped CS0/CS6 via JP12+SW2.8:
+ * 0xef80_0000 0xefff_ffff FLASH (2nd bank) 8M
+ * 0xfc00_0000 0xffff_ffff FLASH (boot bank) 64M
+ *
* Notes:
* CCSRBAR and L2-as-SRAM don't need a configured Local Access Window.
* If flash is 8M at default position (last 8M), no LAW needed.
*/
struct law_entry law_table[] = {
+#ifdef CONFIG_SYS_ALT_BOOT
+ SET_LAW(CONFIG_SYS_ALT_FLASH, LAW_SIZE_8M, LAW_TRGT_IF_LBC),
+#else
SET_LAW(CONFIG_SYS_ALT_FLASH, LAW_SIZE_64M, LAW_TRGT_IF_LBC),
+#endif
#ifndef CONFIG_SPD_EEPROM
SET_LAW(CONFIG_SYS_DDR_SDRAM_BASE, LAW_SIZE_256M, LAW_TRGT_IF_DDR),
#endif