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    SubjectRe: [PATCH] Intel Alder IOAPIC fix


    On Mon, 12 Jan 2004, James Bottomley wrote:
    >
    > OK, with the patch below (to insert_resource) I know get the IO APIC
    > successfully inserted under the reserved fixmap resources:
    >
    > /proc/iomem still looks very odd:
    >
    > fec00000-fec08fff : reserved
    > fec01000-fec013ff : 0000:00:0f.0
    > fffffc00-ffffffff : 0000:00:0f.0
    > fffffc00-ffffffff : 0000:00:0f.0
    > fffffc00-ffffffff : 0000:00:0f.0
    > fffffc00-ffffffff : 0000:00:0f.0
    > fffffc00-ffffffff : 0000:00:0f.0
    > ffe80000-ffffffff : reserved
    >
    > unfortunately, because BARs 1-5 cover the same region.

    I think BARs 1-5 don't exist at all. Being set to all ones is common for
    "unused" (it ends up being a normal result of a lazy probe - you set all
    bits to 1 to check for the size of the region, and if you decide not to
    map it and leave it there, you'll get the above behaviour).

    I suspect only BAR0 is actually real.

    What's in that ffe80000-ffffffff region that the BIOS has allocated,
    anyway?

    Linus
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