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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 <swarren@nvidia.com> Reviewed-by: Peter Korsgaard <jacmet@sunsite.dk> Acked-by: Tom Rini <trini@ti.com> Signed-off-by: Andy Fleming <afleming@freescale.com>
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@ -3645,6 +3645,46 @@ but it can not erase, write this NOR flash by SRIO or PCIE interface.
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You will probably want to define these to avoid a really noisy system
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You will probably want to define these to avoid a really noisy system
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when storing the env in UBI.
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when storing the env in UBI.
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- CONFIG_ENV_IS_IN_MMC:
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Define this if you have an MMC device which you want to use for the
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environment.
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- CONFIG_SYS_MMC_ENV_DEV:
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Specifies which MMC device the environment is stored in.
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- CONFIG_SYS_MMC_ENV_PART (optional):
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Specifies which MMC partition the environment is stored in. If not
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set, defaults to partition 0, the user area. Common values might be
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1 (first MMC boot partition), 2 (second MMC boot partition).
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- CONFIG_ENV_OFFSET:
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- CONFIG_ENV_SIZE:
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These two #defines specify the offset and size of the environment
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area within the specified MMC device.
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These two values are in units of bytes, but must be aligned to an
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MMC sector boundary.
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- CONFIG_ENV_OFFSET_REDUND (optional):
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Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
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hold a redundant copy of the environment data. This provides a
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valid backup copy in case the other copy is corrupted, e.g. due
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to a power failure during a "saveenv" operation.
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This value is also in units of bytes, but must also be aligned to
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an MMC sector boundary.
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- CONFIG_ENV_SIZE_REDUND (optional):
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This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
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set. If this value is set, it must be set to the same value as
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CONFIG_ENV_SIZE.
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- CONFIG_SYS_SPI_INIT_OFFSET
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- CONFIG_SYS_SPI_INIT_OFFSET
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Defines offset to the initial SPI buffer area in DPRAM. The
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Defines offset to the initial SPI buffer area in DPRAM. The
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