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- SD and MMC Device Partitions
- ============================
- Device partitions are additional logical block devices present on the
- SD/MMC device.
- As of this writing, MMC boot partitions as supported and exposed as
- /dev/mmcblkXboot0 and /dev/mmcblkXboot1, where X is the index of the
- parent /dev/mmcblkX.
- MMC Boot Partitions
- ===================
- Read and write access is provided to the two MMC boot partitions. Due to
- the sensitive nature of the boot partition contents, which often store
- a bootloader or bootloader configuration tables crucial to booting the
- platform, write access is disabled by default to reduce the chance of
- accidental bricking.
- To enable write access to /dev/mmcblkXbootY, disable the forced read-only
- access with:
- echo 0 > /sys/block/mmcblkXbootY/force_ro
- To re-enable read-only access:
- echo 1 > /sys/block/mmcblkXbootY/force_ro
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