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board/ti/am335x/README: Document NOR programming

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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>
This commit is contained in:
Tom Rini 2013-07-18 15:13:05 -04:00
parent c5c7a7c32d
commit 486da22967
1 changed files with 23 additions and 0 deletions
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board/ti/am335x/README
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@ -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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