diff options
| author | Johan Rudholm <johan.rudholm@stericsson.com> | 2011-12-02 08:51:06 +0100 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2012-01-11 23:58:43 -0500 |
| commit | add710eaa88606de8ba98a014d37178579e6dbaf (patch) | |
| tree | 2d719508cabd213d5923cef95fdd3d6c9c40d977 /Documentation/mmc | |
| parent | 92df954df3422a7dcf99eea34cf4cb68bb06ea08 (diff) | |
| download | lwn-add710eaa88606de8ba98a014d37178579e6dbaf.tar.gz lwn-add710eaa88606de8ba98a014d37178579e6dbaf.zip | |
mmc: boot partition ro lock support
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 <johan.rudholm@stericsson.com>
Signed-off-by: John Beckett <john.beckett@stericsson.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'Documentation/mmc')
| -rw-r--r-- | Documentation/mmc/mmc-dev-parts.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/mmc/mmc-dev-parts.txt b/Documentation/mmc/mmc-dev-parts.txt index 2db28b8e662f..f08d078d43cf 100644 --- a/Documentation/mmc/mmc-dev-parts.txt +++ b/Documentation/mmc/mmc-dev-parts.txt @@ -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. |