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mmc: boot partition ro lock support

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Enable boot partitions to be read-only locked until next power on via
a sysfs entry. There will be one sysfs entry for each boot partition:

/sys/block/mmcblkXbootY/ro_lock_until_next_power_on

Each boot partition is locked by writing 1 to its file.

Signed-off-by: Johan Rudholm <[email protected]>
Signed-off-by: John Beckett <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
This commit is contained in:
Johan Rudholm 2011-12-02 08:51:06 +01:00 • committed by Chris Ball
commit add710eaa8
5 changed files with 153 additions and 11 deletions
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13
Documentation/mmc/mmc-dev-parts.txt
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@ -25,3 +25,16 @@ 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.