env/ext4.c: allow loading from an EXT4 partition on the MMC boot device
This parallels what I added for FAT in commit 6731bef6, allowing the environment to be found in a specific partition on the device that the board's mmc_get_env_dev() returns. On the Banana Pi R2 that means the device that U-Boot was loaded from; either the internal eMMC or an SD card. Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>
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