forked from Minki/linux
e79265ba6b
In case that the nand device will support some features like Nand Flash Controller, we want to make the sub feature as a sub node of nand device. Use such organization it is easy to enable/disable feature, also it is back compatible and more readable. If the sub-node has a compatible property then it is a driver not partition. Signed-off-by: Josh Wu <josh.wu@atmel.com> Acked-by: Brian Norris <computersforpeace@gmail.com> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> [ added a missing newline -Brian ] Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
72 lines
1.8 KiB
Plaintext
72 lines
1.8 KiB
Plaintext
Representing flash partitions in devicetree
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Partitions can be represented by sub-nodes of an mtd device. This can be used
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on platforms which have strong conventions about which portions of a flash are
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used for what purposes, but which don't use an on-flash partition table such
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as RedBoot.
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NOTE: if the sub-node has a compatible string, then it is not a partition.
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#address-cells & #size-cells must both be present in the mtd device. There are
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two valid values for both:
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<1>: for partitions that require a single 32-bit cell to represent their
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size/address (aka the value is below 4 GiB)
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<2>: for partitions that require two 32-bit cells to represent their
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size/address (aka the value is 4 GiB or greater).
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Required properties:
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- reg : The partition's offset and size within the mtd bank.
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Optional properties:
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- label : The label / name for this partition. If omitted, the label is taken
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from the node name (excluding the unit address).
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- read-only : This parameter, if present, is a hint to Linux that this
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partition should only be mounted read-only. This is usually used for flash
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partitions containing early-boot firmware images or data which should not be
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clobbered.
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Examples:
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flash@0 {
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#address-cells = <1>;
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#size-cells = <1>;
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partition@0 {
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label = "u-boot";
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reg = <0x0000000 0x100000>;
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read-only;
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};
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uimage@100000 {
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reg = <0x0100000 0x200000>;
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};
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};
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flash@1 {
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#address-cells = <1>;
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#size-cells = <2>;
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/* a 4 GiB partition */
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partition@0 {
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label = "filesystem";
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reg = <0x00000000 0x1 0x00000000>;
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};
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};
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flash@2 {
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#address-cells = <2>;
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#size-cells = <2>;
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/* an 8 GiB partition */
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partition@0 {
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label = "filesystem #1";
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reg = <0x0 0x00000000 0x2 0x00000000>;
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};
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/* a 4 GiB partition */
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partition@200000000 {
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label = "filesystem #2";
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reg = <0x2 0x00000000 0x1 0x00000000>;
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};
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};
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