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    SubjectRe: fixing "pci=use_crs"
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    On Wed, Sep 23, 2009 at 8:21 PM, Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:
    > On Wed, 2009-09-23 at 16:28 -0700, Yinghai Lu wrote:
    >> On Wed, Sep 23, 2009 at 4:23 PM, Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:
    >
    >> > P.S.  Yinghai, you posted some patches earlier dealing with "only one
    >> > HT chain."  You apparently have some insight into what's going on here,
    >> > but unfortunately, the changelogs mean absolutely nothing to me.  Can
    >> > you give me any clues?
    >>
    >> which commit?
    >>
    >> normally we only need to have split root resource into several pieces
    >> when we have two HT chains or other io chains...
    >
    > I meant the patches here:
    >  http://lkml.org/lkml/2009/6/24/557
    >
    > My opinion is that ACPI is there to give us an abstract description of
    > the machine, and we shouldn't have to introduce knowledge like "this
    > machine has two HT chains" or add checks in amd_bus.c about
    > "pci_root_num <= 1".
    >
    > But maybe if I knew what an HT chain was and why you think it affects
    > the description returned by _CRS, it would give me a clue about how to
    > deal with this in a generic way.

    we could use _CRS, but lots of BIOS just provide messed up resources
    in _CRS to OS.

    for example, the HW conf register does have mmio high range there, but
    _CRS doesn't report them.

    thought we can use whilelist to use _CRS for them.

    YH
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