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SubjectRe: [2.6.34-rc1 REGRESSION] ahci 0000:00:1f.2: controller reset failed (0xffffffff)
On 04/12/2010 10:56 AM, Bjorn Helgaas wrote:
>
> Linux thinks the windows are:
> pci_root PNP0A03:00: host bridge window [mem 0x000a0000-0x000bffff]
> pci_root PNP0A03:00: host bridge window [mem 0x000c0000-0x000effff]
> pci_root PNP0A03:00: host bridge window [mem 0x000f0000-0x000fffff]
>
> The 0xa0000-0xbffff one makes good sense. That's normally MMIO that's
> routed via PCI to the VGA device frame buffer, and we should be able
> to figure out how to avoid that area, e.g., by using BIOS info, PCI
> class codes, etc.
>
> Now we need to figure how to avoid the 0xc0000-0xeffff and 0xf0000-0xfffff
> windows. Maybe there's something special about how ACPI describes them.
>
> Or maybe we're just unlucky because these are the first windows in the
> _CRS list, and Linux tries them in order, while Windows uses a different
> strategy.
>

I strongly suspects that Windows knows that < 1 MB is special, and only
ever assigns it upon explicit allocation.

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.



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