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