board/ti/am335x/README: Document NAND programming

The AM335x GP EVM ships with NAND.  Document programming of the chip
including the redundant locations that the ROM will check.

Signed-off-by: Tom Rini <trini@ti.com>

diff --git a/board/ti/am335x/README b/board/ti/am335x/README
index ccc5e16066fd13b82322be46f397504faf2020de..6d4535233db51aedad05b425872259aca7c0106f 100644 (file)
--- a/board/ti/am335x/README
+++ b/board/ti/am335x/README
@@ -13,6 +13,30 @@ documented in TI's reference designs:
 - AM335x EVM SK
 - Beaglebone White
 - Beaglebone Black
+'
+NAND
+====
+
+The AM335x GP EVM ships with a 256MiB NAND available in most profiles.  In
+this example to program the NAND we assume that an SD card has been
+inserted with the files to write in the first SD slot and that mtdparts
+have been configured correctly for the board.  As a time saving measure we
+load MLO into memory in one location, copy it into the three locatations
+that the ROM checks for additional valid copies, then load U-Boot into
+memory.  We then write that whole section of memory to NAND.
+
+U-Boot # mmc rescan
+U-Boot # env default -f -a
+U-Boot # nand erase.chip
+U-Boot # saveenv
+U-Boot # load mmc 0 81000000 MLO
+U-Boot # cp.b 81000000 81020000 20000
+U-Boot # cp.b 81000000 81040000 20000
+U-Boot # cp.b 81000000 81060000 20000
+U-Boot # load mmc 0 81080000 u-boot.img
+U-Boot # nand write 81000000 0 260000
+U-Boot # load mmc 0 ${loadaddr} uImage
+U-Boot # nand write ${loadaddr} kernel 500000
 
 Falcon Mode
 ===========