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Add a new config CONFIG_ENV_MMC_USE_DT to force configuration of the U-Boot environment offset with device tree config node. This patch avoids issues when several CONFIG_ENV_IS_IN_XXX are activated, the defconfig file uses the same value for CONFIG_ENV_OFFSET or CONFIG_ENV_OFFSET_REDUND for the several ENV backends (SPI_FLASH, EEPROM NAND, SATA, MMC). After this patch a bad offset value is not possible when the selected partition in device tree is not found. Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>