[U-Boot] [PATCH] sbc8548: document how to write main flash from alternate flash

[Paul Gortmaker <paul.gortmaker@windriver.com>]

If you are running on the alternate flash in order to fix a
corrupted main flash image, it might be good to have the steps
for that documented as well.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 board/sbc8548/README | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/board/sbc8548/README b/board/sbc8548/README
index feac5e3e63e5..493ea837ba3b 100644
--- a/board/sbc8548/README
+++ b/board/sbc8548/README
@@ -138,6 +138,18 @@ image in the SODIMM that is built with CONFIG_SYS_ALT_BOOT enabled,
 	md eff00000 10
 	protect on all
 
+If you are running the alternate 64MB /CS0 settings and want to update
+the "normal" default 8MB u-boot image, then (built with CONFIG_SYS_ALT_BOOT
+disabled) the steps will become:
+
+	tftp u-boot.bin
+	md 200000 10
+	protect off all
+	erase effa0000 efffffff
+	cp.b 200000 effa0000 60000
+	md effa0000 10
+	protect on all
+
 Finally, if you are running the alternate 64MB /CS0 settings and want
 to update the in-use u-boot image, then (again with CONFIG_SYS_ALT_BOOT
 enabled) the steps will become:
-- 
2.2.1