From: Stephen Warren Date: Tue, 11 Jun 2013 21:14:00 +0000 (-0600) Subject: README: document CONFIG_ENV_IS_IN_MMC X-Git-Tag: v2013.07-rc2~96^2~3 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=06e4ae5f8059caac5597e0cfcad5e2e45838fadb;p=oweals%2Fu-boot.git README: document CONFIG_ENV_IS_IN_MMC Describe the meaning of CONFIG_ENV_IS_IN_MMC, and all related defines that must or can be set when using that option. Signed-off-by: Stephen Warren Reviewed-by: Peter Korsgaard Acked-by: Tom Rini Signed-off-by: Andy Fleming --- diff --git a/README b/README index 33bda8c929..f1485bac13 100644 --- a/README +++ b/README @@ -3645,6 +3645,46 @@ but it can not erase, write this NOR flash by SRIO or PCIE interface. You will probably want to define these to avoid a really noisy system when storing the env in UBI. +- CONFIG_ENV_IS_IN_MMC: + + Define this if you have an MMC device which you want to use for the + environment. + + - CONFIG_SYS_MMC_ENV_DEV: + + Specifies which MMC device the environment is stored in. + + - CONFIG_SYS_MMC_ENV_PART (optional): + + Specifies which MMC partition the environment is stored in. If not + set, defaults to partition 0, the user area. Common values might be + 1 (first MMC boot partition), 2 (second MMC boot partition). + + - CONFIG_ENV_OFFSET: + - CONFIG_ENV_SIZE: + + These two #defines specify the offset and size of the environment + area within the specified MMC device. + + These two values are in units of bytes, but must be aligned to an + MMC sector boundary. + + - CONFIG_ENV_OFFSET_REDUND (optional): + + Specifies a second storage area, of CONFIG_ENV_SIZE size, used to + hold a redundant copy of the environment data. This provides a + valid backup copy in case the other copy is corrupted, e.g. due + to a power failure during a "saveenv" operation. + + This value is also in units of bytes, but must also be aligned to + an MMC sector boundary. + + - CONFIG_ENV_SIZE_REDUND (optional): + + This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is + set. If this value is set, it must be set to the same value as + CONFIG_ENV_SIZE. + - CONFIG_SYS_SPI_INIT_OFFSET Defines offset to the initial SPI buffer area in DPRAM. The