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    SubjectRe: regression fixed by using pci=rom
    On Thu, May 08, 2008 at 11:29:39PM -0700, Jesse Barnes wrote:
    > On Thursday, May 08, 2008 6:46 pm Linus Torvalds wrote:
    > > On Thu, 8 May 2008, Jesse Barnes wrote:
    > > > Hm, yeah in many cases we definitely *do* want to try to get the
    > > > expansion ROM space allocated. But maybe it should be a lower priority
    > > > than other BARs... Gary?
    > >
    > > The thing is, a lot of these things have been done this way because not
    > > doing them that way breaks.
    > >
    > > We want to allocate expansion ROM space - even if we don't enable it -
    > > because not doing so will screw up bus sizing etc, and can make it
    > > impossible to allocate later.
    > >
    > > In general, changing PCI allocation strategy is really _really_ dangerous,
    > > even when it is "right", because it tends to expose a lot of issues where
    > > something worked just because it was perhaps indirectly causing a layout
    > > that worked.
    >
    > Yeah, that was my first impression too, but the patch went upstream awhile ago
    > and I didn't see any background except for the changelog.
    >
    > If anything, we should have a pci=norom option instead, so that big systems
    > that don't need the ROMs can use their address space more efficiently.

    This is actually the solution I was going to suggest. I will
    work on it.

    Gary

    --
    Gary Hade
    System x Enablement
    IBM Linux Technology Center
    503-578-4503 IBM T/L: 775-4503
    garyhade@us.ibm.com
    http://www.ibm.com/linux/ltc


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