diff options
Diffstat (limited to 'Documentation/devicetree/bindings/mtd/mtd-physmap.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/mtd/mtd-physmap.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mtd/mtd-physmap.txt b/Documentation/devicetree/bindings/mtd/mtd-physmap.txt index a63c2bd7de2..94de19b8f16 100644 --- a/Documentation/devicetree/bindings/mtd/mtd-physmap.txt +++ b/Documentation/devicetree/bindings/mtd/mtd-physmap.txt | |||
| @@ -16,6 +16,13 @@ file systems on embedded devices. | |||
| 16 | - #address-cells, #size-cells : Must be present if the device has | 16 | - #address-cells, #size-cells : Must be present if the device has |
| 17 | sub-nodes representing partitions (see below). In this case | 17 | sub-nodes representing partitions (see below). In this case |
| 18 | both #address-cells and #size-cells must be equal to 1. | 18 | both #address-cells and #size-cells must be equal to 1. |
| 19 | - no-unaligned-direct-access: boolean to disable the default direct | ||
| 20 | mapping of the flash. | ||
| 21 | On some platforms (e.g. MPC5200) a direct 1:1 mapping may cause | ||
| 22 | problems with JFFS2 usage, as the local bus (LPB) doesn't support | ||
| 23 | unaligned accesses as implemented in the JFFS2 code via memcpy(). | ||
| 24 | By defining "no-unaligned-direct-access", the flash will not be | ||
| 25 | exposed directly to the MTD users (e.g. JFFS2) any more. | ||
| 19 | 26 | ||
| 20 | For JEDEC compatible devices, the following additional properties | 27 | For JEDEC compatible devices, the following additional properties |
| 21 | are defined: | 28 | are defined: |