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    SubjectRe: [BUG] 2.6.26-rc1 broke X on SPARC Ultra5
    >  >
    > > > Fatal server error:
    > > > xf86MapPciMem: Could not mmap PCI memory [base=0xe2000000,hostbase=0xe2000000,size=2000] (No such file or directory)
    > > >
    > > > I'll start digging through 2.6.25->2.6.26-rc1 later today,
    > > > meanwhile I've put Xorg.0.log, Xorg strace, dmesg, and .config
    > > > files for 2.6.25 (working) and 2.6.26-rc4 (failing) in
    > > > <http://user.it.uu.se/~mikpe/linux/sparc64-2.6.26-rcN-xorg-bug/>.
    > >
    > > It's likely this change below. Unfortunately older versions of X
    > > seemingly cannot cope with a lack of PCI host controller in the PCI
    > > hierarchy exported by the kernel.
    > >
    > > That's really a bug in X, current libpciaccess based X servers work
    > > fine, and the bug fixed by this changeset is not solvable in any other
    > > reasonable way. So unfortunately older X verions will stay not
    > > working. Sorry.
    > >
    > > commit c26d3c0138970778fabe114df99dffb34a04b1d7
    > > Author: David S. Miller <davem@davemloft.net>
    > > Date: Thu May 1 01:12:40 2008 -0700
    >
    > Confirmed. Reverting this patch from 2.6.26-rc1 made my Xorg-7.1.1 work again.
    >
    > It's a shame though that a bug fix needs to have such draconian consequences.
    >

    Wow thats a major userspace regression to ship, we'd never get away
    with doing that on x86 platforms.

    Dave.


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