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authorTom Rini <trini@ti.com>2013-07-18 15:13:05 -0400
committerTom Rini <trini@ti.com>2013-07-30 09:21:41 -0400
commit486da22967474f3f72717883a4315fda46346897 (patch)
tree0e5eaa954fe38381f4951e23fb6c202db5719993 /board
parentc5c7a7c32d552592ac49749e5c184c89bd50c098 (diff)
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board/ti/am335x/README: Document NOR programming
The Beaglebone White may be populated with a memory cape that has a NOR module. Document how to program it. Signed-off-by: Tom Rini <trini@ti.com>
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diff --git a/board/ti/am335x/README b/board/ti/am335x/README
index 6d45352..67b5246 100644
--- a/board/ti/am335x/README
+++ b/board/ti/am335x/README
@@ -38,6 +38,29 @@ U-Boot # nand write 81000000 0 260000
U-Boot # load mmc 0 ${loadaddr} uImage
U-Boot # nand write ${loadaddr} kernel 500000
+NOR
+===
+
+The Beaglebone White can be equiped with a "memory cape" that in turn can
+have a NOR module plugged into it. In this case it is then possible to
+program and boot from NOR. Note that due to how U-Boot is architectured we
+must build a specific version of U-Boot that knows we have NOR flash. This
+build is named 'am335x_evm_nor'. Further, we have a 'am335x_evm_norboot'
+build that will assume that the environment is on NOR rather than NAND. In
+the following example we assume that and SD card has been populated with
+MLO and u-boot.img from a 'am335x_evm_nor' build and also contains the
+'u-boot.bin' from a 'am335x_evm_norboot' build. When booting from NOR, a
+binary must be written to the start of NOR, with no header or similar
+prepended. In the following example we use a size of 512KiB (0x80000)
+as that is how much space we set aside before the environment, as per
+the config file.
+
+U-Boot # mmc rescan
+U-Boot # load mmc 0 ${loadaddr} u-boot.bin
+U-Boot # protect off 08000000 +80000
+U-Boot # erase 08000000 +80000
+U-Boot # cp.b ${loadaddr} 08000000 ${filesize}
+
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