From: Scott Wood Date: Fri, 17 Sep 2010 19:38:37 +0000 (-0500) Subject: README: Add new NAND env features X-Git-Tag: v2010.12-rc1~137 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=fdd813def82c3405cb999c05154212bacd7b6126;p=oweals%2Fu-boot.git README: Add new NAND env features CONFIG_ENV_SIZE does not need block alignment. Document CONFIG_ENV_RANGE and CONFIG_ENV_OFFSET_OOB. Signed-off-by: Scott Wood --- diff --git a/README b/README index f997a5d860..197804e354 100644 --- a/README +++ b/README @@ -2534,18 +2534,32 @@ to save the current settings. - CONFIG_ENV_SIZE: These two #defines specify the offset and size of the environment - area within the first NAND device. + area within the first NAND device. CONFIG_ENV_OFFSET must be + aligned to an erase block boundary. - - CONFIG_ENV_OFFSET_REDUND + - CONFIG_ENV_OFFSET_REDUND (optional): This setting describes a second storage area of CONFIG_ENV_SIZE - size used to hold a redundant copy of the environment data, - so that there is a valid backup copy in case there is a - power failure during a "saveenv" operation. - - Note: CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND must be aligned - to a block boundary, and CONFIG_ENV_SIZE must be a multiple of - the NAND devices block size. + size used to hold a redundant copy of the environment data, so + that there is a valid backup copy in case there is a power failure + during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be + aligned to an erase block boundary. + + - CONFIG_ENV_RANGE (optional): + + Specifies the length of the region in which the environment + can be written. This should be a multiple of the NAND device's + block size. Specifying a range with more erase blocks than + are needed to hold CONFIG_ENV_SIZE allows bad blocks within + the range to be avoided. + + - CONFIG_ENV_OFFSET_OOB (optional): + + Enables support for dynamically retrieving the offset of the + environment from block zero's out-of-band data. The + "nand env.oob" command can be used to record this offset. + Currently, CONFIG_ENV_OFFSET_REDUND is not supported when + using CONFIG_ENV_OFFSET_OOB. - CONFIG_NAND_ENV_DST