X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=board%2Fsbc8641d%2FREADME;h=4999b7763c9c024b47741c37cd5c987b3a32e24a;hb=2772f6d55c11e4362c43e54c6f14090a981bbd2b;hp=a051466a11b052dc2bb8d64b83b86a8fda9ef26f;hpb=702e6014f15b307f144fa03ecaf83a8446c6802a;p=oweals%2Fu-boot.git

diff --git a/board/sbc8641d/README b/board/sbc8641d/README
index a051466a11..4999b7763c 100644
--- a/board/sbc8641d/README
+++ b/board/sbc8641d/README
@@ -3,7 +3,7 @@ Wind River SBC8641D reference board
 
 Created 06/14/2007 Joe Hamman
 Copyright 2007, Embedded Specialties, Inc.
-Copyright 2007 Wind River Systemes, Inc.
+Copyright 2007 Wind River Systems, Inc.
 -----------------------------
 
 1. Building U-Boot
@@ -26,3 +26,24 @@ and settings may change with board revisions.
 --------------------
 PCI:
 	The PCI command may hang if no boards are present in either slot.
+
+4. Reflashing U-Boot
+--------------------
+The board has two independent flash devices which can be used for dual
+booting, or for U-Boot backup and recovery.  A two pin jumper on the
+three pin JP10 determines which device is attached to /CS0 line.
+
+Assuming one device has a functional U-Boot, and the other device has
+a recently installed non-functional image, to perform a recovery from
+that non-functional image goes essentially as follows:
+
+a) power down the board and jumper JP10 to select the functional image.
+b) power on the board and let it get to U-Boot prompt.
+c) while on, using static precautions, move JP10 back to the failed image.
+d) use "md fff00000" to confirm you are looking at the failed image
+e) turn off write protect with "prot off all"
+f) get new image, i.e. "tftp 200000 /somepath/u-boot.bin"
+g) erase failed image: "erase FFF00000 FFF5FFFF"
+h) copy in new image: "cp.b 200000 FFF00000 60000"
+i) ensure new image is written: "md fff00000"
+k) power cycle the board and confirm new image works.