[U-Boot] [PATCH v2] 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.

Also delete any protect commands from non-active flash banks;
they are only required for the instances where you are writing
to the currently in use flash image.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---

[v2: drop protect commands from instances where we flash the non
     active flash bank ; it wasn't protected anyway.]

 board/sbc8548/README | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/board/sbc8548/README b/board/sbc8548/README
index feac5e3e63e5..92731645f266 100644
--- a/board/sbc8548/README
+++ b/board/sbc8548/README
@@ -132,11 +132,19 @@ image in the SODIMM that is built with CONFIG_SYS_ALT_BOOT enabled,
 
 	tftp u-boot.bin
 	md 200000 10
-	protect off all
 	era eff00000 efffffff
 	cp.b 200000 eff00000 100000
 	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
+	erase effa0000 efffffff
+	cp.b 200000 effa0000 60000
+	md effa0000 10
 
 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
-- 
2.2.1