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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /Documentation/block/cmdline-partition.txt |
Initial import
Diffstat (limited to 'Documentation/block/cmdline-partition.txt')
-rw-r--r-- | Documentation/block/cmdline-partition.txt | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/Documentation/block/cmdline-partition.txt b/Documentation/block/cmdline-partition.txt new file mode 100644 index 000000000..525b9f6d7 --- /dev/null +++ b/Documentation/block/cmdline-partition.txt @@ -0,0 +1,39 @@ +Embedded device command line partition parsing +===================================================================== + +Support for reading the block device partition table from the command line. +It is typically used for fixed block (eMMC) embedded devices. +It has no MBR, so saves storage space. Bootloader can be easily accessed +by absolute address of data on the block device. +Users can easily change the partition. + +The format for the command line is just like mtdparts: + +blkdevparts=<blkdev-def>[;<blkdev-def>] + <blkdev-def> := <blkdev-id>:<partdef>[,<partdef>] + <partdef> := <size>[@<offset>](part-name) + +<blkdev-id> + block device disk name, embedded device used fixed block device, + it's disk name also fixed. such as: mmcblk0, mmcblk1, mmcblk0boot0. + +<size> + partition size, in bytes, such as: 512, 1m, 1G. + +<offset> + partition start address, in bytes. + +(part-name) + partition name, kernel send uevent with "PARTNAME". application can create + a link to block device partition with the name "PARTNAME". + user space application can access partition by partition name. + +Example: + eMMC disk name is "mmcblk0" and "mmcblk0boot0" + + bootargs: + 'blkdevparts=mmcblk0:1G(data0),1G(data1),-;mmcblk0boot0:1m(boot),-(kernel)' + + dmesg: + mmcblk0: p1(data0) p2(data1) p3() + mmcblk0boot0: p1(boot) p2(kernel) |