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mmc: MMC boot partitions support.

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Allows device MMC boot partitions to be accessed. MMC partitions are
treated effectively as separate block devices on the same MMC card.

Signed-off-by: Andrei Warkentin <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
This commit is contained in:
Andrei Warkentin 2011-04-11 18:10:25 -05:00 • committed by Chris Ball
commit 371a689f64
7 changed files with 305 additions and 42 deletions
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2
Documentation/mmc/00-INDEX
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@ -2,3 +2,5 @@
- this file
mmc-dev-attrs.txt
- info on SD and MMC device attributes
mmc-dev-parts.txt
- info on SD and MMC device partitions

10
Documentation/mmc/mmc-dev-attrs.txt
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@ -1,3 +1,13 @@
SD and MMC Block Device Attributes
==================================
These attributes are defined for the block devices associated with the
SD or MMC device.
The following attributes are read/write.
force_ro Enforce read-only access even if write protect switch is off.
SD and MMC Device Attributes
============================

27
Documentation/mmc/mmc-dev-parts.txt Normal file
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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