Messages in this thread | | | Date | Mon, 12 Apr 2010 18:51:45 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [2.6.34-rc1 REGRESSION] ahci 0000:00:1f.2: controller reset failed (0xffffffff) |
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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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