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    SubjectRe: [PATCH]PCI:disable resource decode in PCI BAR detection
    On Fri, Sep 14, 2007 at 08:30:59AM -0600, Robert Hancock wrote:
    > Do you have an example of specific hardware that exhibits this problem?

    Well, first two results of google search for "disable bar when sizing":
    http://lkml.org/lkml/2002/12/21/95
    http://lkml.org/lkml/2002/12/20/110

    > So far after a similar patch has been in -mm for months there have been
    > no reports of any such problems.

    You cannot compare user base of -mm and release kernels. Also, note
    that we're talking about maybe 0.01% of systems running Linux.
    And similar patch appeared in various trees several times over the last
    decade and every time it had to be reverted.

    > This isn't guaranteed to help. I don't think it is only integrated
    > graphics that could cause this problem, I think that an add-on PCI
    > Express card can do this as well. Depending on the chipset memory decode
    > rules, any PCI or PCI Express device with a BAR large enough could cause
    > issues.

    No, it's impossible for several reasons. Most obvious one is that a PCI-E
    bridge does isolate stuff quite nicely.

    Ivan.
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