1 Embedded device command line partition parsing
2 =====================================================================
4 Support for reading the block device partition table from the command line.
5 It is typically used for fixed block (eMMC) embedded devices.
6 It has no MBR, so saves storage space. Bootloader can be easily accessed
7 by absolute address of data on the block device.
8 Users can easily change the partition.
10 The format for the command line is just like mtdparts:
12 blkdevparts=<blkdev-def>[;<blkdev-def>]
13 <blkdev-def> := <blkdev-id>:<partdef>[,<partdef>]
14 <partdef> := <size>[@<offset>](part-name)
17 block device disk name, embedded device used fixed block device,
18 it's disk name also fixed. such as: mmcblk0, mmcblk1, mmcblk0boot0.
21 partition size, in bytes, such as: 512, 1m, 1G.
24 partition start address, in bytes.
27 partition name, kernel send uevent with "PARTNAME". application can create
28 a link to block device partition with the name "PARTNAME".
29 user space application can access partition by partition name.
32 eMMC disk name is "mmcblk0" and "mmcblk0boot0"
35 'blkdevparts=mmcblk0:1G(data0),1G(data1),-;mmcblk0boot0:1m(boot),-(kernel)'
38 mmcblk0: p1(data0) p2(data1) p3()
39 mmcblk0boot0: p1(boot) p2(kernel)