On Wed, Aug 4, 2010 at 05:33, David Woodhouse wrote: > On Sat, 2010-06-12 at 17:26 +0300, Artem Bityutskiy wrote: >> On Sun, 2010-05-23 at 03:30 -0400, Mike Frysinger wrote: >> > Currently, romfs XIP doesn't work in flash memory (the kernel crashes >> > with a null pointer dereference). The problem is that the mtd physmap >> > driver isn't setting up a get_unmapped_area pointer for the mtd >> > partitions it creates. >> >> Pushed both to my l2-mtd-2.6.git / dunno. > > I'm confused by the second patch -- isn't this done in add_mtd_device() > already, according to the device type? > > You're setting mtd_bdi_ro_mappable indiscriminately for all types of > devices. For flash devices, that can be an issue -- if you schedule a > userspace process while the kernel is writing to the flash, for example. > > If you want to allow XIP of writable flash devices, there's more to it > than this.
can you can safely do XIP on writable flash devices ? with nommu, you certainly cant. plus, it is only possible with certain filesystems right ? like ROMFS ? and that's already r/o ... if we delve a bit, what you're referring to is only possible i think if this change is merged (we posted this back in Jan w/no feedback): mtd-physmap: add support users can assign the probe type in board files otherwise, there's no way of declaring a physmap of a parallel nor flash and having it end up with read-only capabilities ... -mike _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
