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authorMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-04-18 14:44:06 -0300
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-07-15 09:20:26 -0300
commitf408510c4ff38965289bb53e8462861ad05dfada (patch)
tree9a9bc49a3ee8fa8b97c8dce1671321df0856997e /Documentation/mmc/mmc-dev-parts.txt
parent8ea0afa3b801e9fe3ff676c3e60e74afa1a0848a (diff)
downloadlwn-f408510c4ff38965289bb53e8462861ad05dfada.tar.gz
lwn-f408510c4ff38965289bb53e8462861ad05dfada.zip
docs: mmc: convert to ReST
Rename the mmc documentation files to ReST, add an index for them and adjust in order to produce a nice html output via the Sphinx build system. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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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,
-with:
-
-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
-bricking.