partition.txt (1571B)
1Flash partitions in device tree 2=============================== 3 4Flash devices can be partitioned into one or more functional ranges (e.g. "boot 5code", "nvram", "kernel"). 6 7Different devices may be partitioned in a different ways. Some may use a fixed 8flash layout set at production time. Some may use on-flash table that describes 9the geometry and naming/purpose of each functional region. It is also possible 10to see these methods mixed. 11 12To assist system software in locating partitions, we allow describing which 13method is used for a given flash device. To describe the method there should be 14a subnode of the flash device that is named 'partitions'. It must have a 15'compatible' property, which is used to identify the method to use. 16 17When a single partition is represented with a DT node (it depends on a used 18format) it may also be described using above rules ('compatible' and optionally 19some extra properties / subnodes). It allows describing more complex, 20hierarchical (multi-level) layouts and should be used if there is some 21significant relation between partitions or some partition internally uses 22another partitioning method. 23 24Available bindings are listed in the "partitions" subdirectory. 25 26 27Deprecated: partitions defined in flash node 28============================================ 29 30For backwards compatibility partitions as direct subnodes of the flash device are 31supported. This use is discouraged. 32NOTE: also for backwards compatibility, direct subnodes that have a compatible 33string are not considered partitions, as they may be used for other bindings.