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authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 16:55:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 16:55:55 -0700
commit8c1c77ff9be27137fa7cbbf51efedef1a2ae915b (patch)
treecdbd09cac5f5d1c6eb5ec4257dc478c6acca70c5 /Documentation
parentf3ae1c75203535f65448517e46c8dd70a56b6c71 (diff)
parent08ee80cc397ac1a306ca689a22ede954d92d0db1 (diff)
downloadop-kernel-dev-8c1c77ff9be27137fa7cbbf51efedef1a2ae915b.zip
op-kernel-dev-8c1c77ff9be27137fa7cbbf51efedef1a2ae915b.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (75 commits) mmc: core: eMMC bus width may not work on all platforms mmc: sdhci: Auto-CMD23 fixes. mmc: sdhci: Auto-CMD23 support. mmc: core: Block CMD23 support for UHS104/SDXC cards. mmc: sdhci: Implement MMC_CAP_CMD23 for SDHCI. mmc: core: Use CMD23 for multiblock transfers when we can. mmc: quirks: Add/remove quirks conditional support. mmc: Add new VUB300 USB-to-SD/SDIO/MMC driver mmc: sdhci-pxa: Add quirks for DMA/ADMA to match h/w mmc: core: duplicated trial with same freq in mmc_rescan_try_freq() mmc: core: add support for eMMC Dual Data Rate mmc: core: eMMC signal voltage does not use CMD11 mmc: sdhci-pxa: add platform code for UHS signaling mmc: sdhci: add hooks for setting UHS in platform specific code mmc: core: clear MMC_PM_KEEP_POWER flag on resume mmc: dw_mmc: fixed wrong regulator_enable in suspend/resume mmc: sdhi: allow powering down controller with no card inserted mmc: tmio: runtime suspend the controller, where possible mmc: sdhi: support up to 3 interrupt sources mmc: sdhi: print physical base address and clock rate ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ioctl/ioctl-number.txt1
-rw-r--r--Documentation/mmc/00-INDEX2
-rw-r--r--Documentation/mmc/mmc-dev-attrs.txt10
-rw-r--r--Documentation/mmc/mmc-dev-parts.txt27
4 files changed, 40 insertions, 0 deletions
diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index 2d1ad12..3a46e36 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -304,6 +304,7 @@ Code Seq#(hex) Include File Comments
0xB0 all RATIO devices in development:
<mailto:vgo@ratio.de>
0xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
+0xB3 00 linux/mmc/ioctl.h
0xC0 00-0F linux/usb/iowarrior.h
0xCB 00-1F CBM serial IEC bus in development:
<mailto:michael.klein@puffin.lb.shuttle.de>
diff --git a/Documentation/mmc/00-INDEX b/Documentation/mmc/00-INDEX
index fca586f..93dd7a7 100644
--- a/Documentation/mmc/00-INDEX
+++ b/Documentation/mmc/00-INDEX
@@ -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
diff --git a/Documentation/mmc/mmc-dev-attrs.txt b/Documentation/mmc/mmc-dev-attrs.txt
index ff2bd68..8898a95 100644
--- a/Documentation/mmc/mmc-dev-attrs.txt
+++ b/Documentation/mmc/mmc-dev-attrs.txt
@@ -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
============================
diff --git a/Documentation/mmc/mmc-dev-parts.txt b/Documentation/mmc/mmc-dev-parts.txt
new file mode 100644
index 0000000..2db28b8
--- /dev/null
+++ b/Documentation/mmc/mmc-dev-parts.txt
@@ -0,0 +1,27 @@
+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
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