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Flash partitions in device tree
Flash devices can be partitioned into one or more functional ranges (e.g. "boot
code", "nvram", "kernel").
Different devices may be partitioned in a different ways. Some may use a fixed
flash layout set at production time. Some may use on-flash table that describes
the geometry and naming/purpose of each functional region. It is also possible
to see these methods mixed.
To assist system software in locating partitions, we allow describing which
method is used for a given flash device. To describe the method there should be
a subnode of the flash device that is named 'partitions'. It must have a
'compatible' property, which is used to identify the method to use.
When a single partition is represented with a DT node (it depends on a used
format) it may also be described using above rules ('compatible' and optionally
some extra properties / subnodes). It allows describing more complex,
hierarchical (multi-level) layouts and should be used if there is some
significant relation between partitions or some partition internally uses
another partitioning method.
Available bindings are listed in the "partitions" subdirectory.
Deprecated: partitions defined in flash node
For backwards compatibility partitions as direct subnodes of the flash device are
supported. This use is discouraged.
NOTE: also for backwards compatibility, direct subnodes that have a compatible
string are not considered partitions, as they may be used for other bindings.