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Stephen Warren committed 06e4ae5f805
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>