Hi everybody, as part of a ARCH=ppc to ARCH=powerpc migration process, I'm looking for an OpenFirmware compatible way to handle a RAM-based MTD device.
On the platform_device based ppc architecture, the drivers/mtd/maps/plat-ram.c driver handled "mtd-ram" platform devices. There is no such driver for the OF-based powerpc architecture. As a temporary workaround I hacked the physmap_of driver to handle "direct-mapped" OF devices oh type "ram" by adding a corresponding entry in the of_flash_match[] array. This seems to work fine. What would be the preferred way to handle OF-compatible RAM-based MTD devices ? The 3 ways I can think of are 1. porting the plat-ram driver to OF (the driver isn't used in the kernel tree but I suspect it is used by out-of-tree boards) 2. creating a new plat-ram-of driver, much like the physmap_of driver comes from the physmap driver 3. extending the physmap_of driver to handle RAM devices (in which case references to "flash" in the function names should probably be replaced by "mtd") I live option 3 better so far. Has anyone already worked on this ? Is there any defined device tree mapping for MTD RAM devices ? Best regards, -- Laurent Pinchart CSE Semaphore Belgium Chaussée de Bruxelles, 732A B-1410 Waterloo Belgium T +32 (2) 387 42 59 F +32 (2) 387 42 75
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