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| author | Aaron Sierra <asierra@xes-inc.com> | 2014-09-25 19:20:24 +0200 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2015-01-10 08:24:27 +0100 |
| commit | 6958024ad5cdd78deae4da47a8722b06317dff45 (patch) | |
| tree | 14e081920d299eab8c7fa7ece0f67aefd60c37df /Documentation | |
| parent | mtd: physmap_of: Add read-only fallback (diff) | |
| download | linux-6958024ad5cdd78deae4da47a8722b06317dff45.tar.xz linux-6958024ad5cdd78deae4da47a8722b06317dff45.zip | |
mtd: map_rom: Support UBI on ROM
UBI needs to know the physical erase block size, even on read-only
devices, since it defines the on-device layout. Use a device-tree
provided value to support previously written UBI on read-only NOR.
UBI also needs a non-zero writebufsize, so we set it to one.
Note: This was implemented because hardware write-protected CFI
NOR cannot be probed for the physical erase block size.
Signed-off-by: Joe Schultz <jschultz@xes-inc.ccom>
Signed-off-by: Aaron Sierra <asierra@xes-inc.ccom>
[Brian: removed unneeded #ifdef, note 'optional' erase-size property]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/mtd/mtd-physmap.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mtd/mtd-physmap.txt b/Documentation/devicetree/bindings/mtd/mtd-physmap.txt index 6b9f680cb579..4a0a48bf4ecb 100644 --- a/Documentation/devicetree/bindings/mtd/mtd-physmap.txt +++ b/Documentation/devicetree/bindings/mtd/mtd-physmap.txt @@ -36,6 +36,11 @@ are defined: - vendor-id : Contains the flash chip's vendor id (1 byte). - device-id : Contains the flash chip's device id (1 byte). +For ROM compatible devices (and ROM fallback from cfi-flash), the following +additional (optional) property is defined: + + - erase-size : The chip's physical erase block size in bytes. + The device tree may optionally contain sub-nodes describing partitions of the address space. See partition.txt for more detail. |