CONFIG_ENV_SIZE does not need block alignment.

Document CONFIG_ENV_RANGE and CONFIG_ENV_OFFSET_OOB.

Signed-off-by: Scott Wood scottwood@freescale.com --- CONFIG_ENV_SIZE doesn't even need page alignment.

README | 32 +++++++++++++++++++++++--------- 1 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/README b/README index aa11c37..096c4f3 100644 --- a/README +++ b/README @@ -2549,18 +2549,32 @@ 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