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authorBen Gardiner <bengardiner@nanometrics.ca>2010-07-05 13:27:07 -0400
committerScott Wood <scottwood@freescale.com>2010-07-12 13:56:46 -0500
commitc9f7351b5bb70d292f6b0baaf0e21366e0b0b163 (patch)
tree19b4353d9a4c5428b486e19f803c1855107cd76f /doc/README.at91-soc
parent67ceefa79b86d9d72b7487005a6a8a61cd6a1d66 (diff)
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NAND: environment offset in OOB (CONFIG_ENV_OFFSET_OOB)
This is a re-submission of the patch by Harald Welte <laforge@openmoko.org> with minor modifications for rebase and changes as suggested by Scott Wood <scottwood@freescale.com> [1] [2]. This patch enables the environment partition to have a run-time dynamic location (offset) in the NAND flash. The reason for this is simply that all NAND flashes have factory-default bad blocks, and a fixed compile time offset would mean that sometimes the environment partition would live inside factory bad blocks. Since the number of factory default blocks can be quite high (easily 1.3MBytes in current standard components), it is not economic to keep that many spare blocks inside the environment partition. With this patch and CONFIG_ENV_OFFSET_OOB enabled, the location of the environment partition is stored in the out-of-band (OOB) data of the first block in flash. Since the first block is where most systems boot from, the vendors guarantee that the first block is not a factory default block. This patch introduces the 'nand env.oob' command, which can be called from the u-boot command line. 'nand env.oob get' reads the address of the environment partition from the OOB data, 'nand env.oob set {offset,partition-name}' allows the setting of the marker by specifying a numeric offset or a partition name. [1] http://article.gmane.org/gmane.comp.boot-loaders.u-boot/43916 [2] http://article.gmane.org/gmane.comp.boot-loaders.u-boot/79195 Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca> Acked-by: Harald Welte <laforge@gnumonks.org>
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