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Documentation / devicetree / bindings / mtd / partition.txt




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Based on kernel version 3.16. Page generated on 2014-08-06 21:37 EST.

1	Representing flash partitions in devicetree
2	
3	Partitions can be represented by sub-nodes of an mtd device. This can be used
4	on platforms which have strong conventions about which portions of a flash are
5	used for what purposes, but which don't use an on-flash partition table such
6	as RedBoot.
7	NOTE: if the sub-node has a compatible string, then it is not a partition.
8	
9	#address-cells & #size-cells must both be present in the mtd device. There are
10	two valid values for both:
11	<1>: for partitions that require a single 32-bit cell to represent their
12	     size/address (aka the value is below 4 GiB)
13	<2>: for partitions that require two 32-bit cells to represent their
14	     size/address (aka the value is 4 GiB or greater).
15	
16	Required properties:
17	- reg : The partition's offset and size within the mtd bank.
18	
19	Optional properties:
20	- label : The label / name for this partition.  If omitted, the label is taken
21	  from the node name (excluding the unit address).
22	- read-only : This parameter, if present, is a hint to Linux that this
23	  partition should only be mounted read-only. This is usually used for flash
24	  partitions containing early-boot firmware images or data which should not be
25	  clobbered.
26	
27	Examples:
28	
29	
30	flash@0 {
31		#address-cells = <1>;
32		#size-cells = <1>;
33	
34		partition@0 {
35			label = "u-boot";
36			reg = <0x0000000 0x100000>;
37			read-only;
38		};
39	
40		uimage@100000 {
41			reg = <0x0100000 0x200000>;
42		};
43	};
44	
45	flash@1 {
46		#address-cells = <1>;
47		#size-cells = <2>;
48	
49		/* a 4 GiB partition */
50		partition@0 {
51			label = "filesystem";
52			reg = <0x00000000 0x1 0x00000000>;
53		};
54	};
55	
56	flash@2 {
57		#address-cells = <2>;
58		#size-cells = <2>;
59	
60		/* an 8 GiB partition */
61		partition@0 {
62			label = "filesystem #1";
63			reg = <0x0 0x00000000 0x2 0x00000000>;
64		};
65	
66		/* a 4 GiB partition */
67		partition@200000000 {
68			label = "filesystem #2";
69			reg = <0x2 0x00000000 0x1 0x00000000>;
70		};
71	};
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