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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
-The boot partitions can also be locked read only until the next power on,
-echo 1 > /sys/block/mmcblkXbootY/ro_lock_until_next_power_on
-This is a feature of the card and not of the kernel. If the card does
-not support boot partition locking, the file will not exist. If the
-feature has been disabled on the card, the file will be read-only.
-The boot partitions can also be locked permanently, but this feature is
-not accessible through sysfs in order to avoid accidental or malicious