| Embedded device command line partition |
| ===================================================================== |
| |
| Read block device partition table from command line. |
| The partition used for fixed block device (eMMC) embedded device. |
| It is no MBR, save 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) |