Erwin Authried <[email protected]> wrote: > I have used XIP with armnommu on mtd devices with 2.4, and I want to use XIP > with 2.6 now. I have seen David Howell's patches from 2008-9-24 that add the > necessary support in MTD. In arch/arm, it looks like arch_get_unmapped_area() > is available for arm with mmu only, is it required to implement this for nommu > as well to be able to use XIP?
arch_get_unmapped_area() find a piece of unmapped _virtual_ memory space that can then be mapped to a physical area, so it doesn't make sense to have an overriding arch one for the NOMMU case: virtual memory is more or less identical with physical memory - and where in virtual memory a mappable object will be places depends entirely on where in physical memory it is. For XIP in NOMMU mode, the device or filesystem driver needs to provide the get_unmapped_area() file op so that the driver can tell mmap() where the object exists physically. This is really an abuse of the API, but it seems to work. David _______________________________________________ uClinux-dev mailing list [email protected] http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by [email protected] To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
