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    SubjectRe: [PATCH] PCI: Always set prefetchable base/limit upper32 registers
    On Mon, Nov 30, 2009 at 01:52:03PM -0800, Yinghai Lu wrote:
    > if HW state that reg is only 32bit pref,
    > why should we care about the upper 32bit?

    pref_mem64 describes the resource, not the HW.

    All the PCI specs define Type 1 configuration space with Prefetchable Memory
    register as 64-bit. Even if the Type 1 (PCI Bridge) HW ignores this register.
    See "7.5.3. Type 1 Configuration Space Header" of PCI EXPRESS BASE
    SPECIFICATION, REV. 1.1.

    > looks like that your bridge device need quirk to clear that so called
    > upper 32bit for it.

    Hrm...I don't think this is a quirk. PCI spec defines 64-bit PrefMem
    window register regardless of what type of resource we program into it.

    hth,
    grant


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