1 ==============================================
2 Embedded device command line partition parsing
3 ==============================================
4
5 The "blkdevparts" command line option adds sup
6 block device partition table from the kernel c
7
8 It is typically used for fixed block (eMMC) em
9 It has no MBR, so saves storage space. Bootloa
10 by absolute address of data on the block devic
11 Users can easily change the partition.
12
13 The format for the command line is just like m
14
15 blkdevparts=<blkdev-def>[;<blkdev-def>]
16 <blkdev-def> := <blkdev-id>:<partdef>[,<part
17 <partdef> := <size>[@<offset>](part-name)
18
19 <blkdev-id>
20 block device disk name. Embedded device us
21 Its disk name is also fixed, such as: mmcb
22
23 <size>
24 partition size, in bytes, such as: 512, 1m
25 size may contain an optional suffix of (up
26
27 K, M, G, T, P, E.
28
29 "-" is used to denote all remaining space.
30
31 <offset>
32 partition start address, in bytes.
33 offset may contain an optional suffix of (
34
35 K, M, G, T, P, E.
36
37 (part-name)
38 partition name. Kernel sends uevent with "
39 create a link to block device partition wi
40 User space application can access partitio
41
42 Example:
43
44 eMMC disk names are "mmcblk0" and "mmcblk0
45
46 bootargs::
47
48 'blkdevparts=mmcblk0:1G(data0),1G(data1),-
49
50 dmesg::
51
52 mmcblk0: p1(data0) p2(data1) p3()
53 mmcblk0boot0: p1(boot) p2(kernel)
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