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SubjectRe: fixing "pci=use_crs"
Bjorn Helgaas wrote:
> It looks like you have an HP box -- what exactly is it and
> what BIOS version do you have? Maybe I can borrow one to play
> with myself so I don't have to bug you as much.

It is an HP dv2815nr. The BIOS is F.21. I understand that debugging
is much easier when you have the machine in hand, but I don't mind
providing information.

> You don't happen to have Windows on it also, do you? If you do,
> I'd like to know what the device manager says about the PCI bridges.

The only Windows I have is on a VirtualBox VM. The machine came with
Vista, but it kept self destructing, thus I blew it away. I cannot do
it now as I am traveling, but I have a Bart's PE disk at home. I
should be able to look at the device manager picture with it.

> Your dmesg from LKML
> (http://thread.gmane.org/gmane.linux.kernel/856413/focus=856458)
> suggests that ACPI told us about a whole bunch of resources:
>
> pci_bus 0000:00: resource 0 io: [0x00-0xcf7]
> pci_bus 0000:00: resource 1 io: [0xd00-0xffff]
> pci_bus 0000:00: resource 2 mem: [0x0a0000-0x0bffff]
> pci_bus 0000:00: resource 3 mem: [0x0c0000-0x0c3fff]
> pci_bus 0000:00: resource 4 mem: [0x0c4000-0x0c7fff]
> pci_bus 0000:00: resource 5 mem: [0x0c8000-0x0cbfff]
> pci_bus 0000:00: resource 6 mem: [0x0cc000-0x0cffff]
> pci_bus 0000:00: resource 7 mem: [0x0d4000-0x0d7fff]
> pci_bus 0000:00: resource 8 mem: [0x0d8000-0x0dbfff]
> pci_bus 0000:00: resource 9 mem: [0x0dc000-0x0dffff]
> ...
>
> but the new dmesg (http://bugzilla.kernel.org/attachment.cgi?id=23106)
> only has a few:
>
> pci_bus 0000:00: resource 0 io: [0x00-0xffff]
> pci_bus 0000:00: resource 1 mem: [0x000000-0xffffffffffffffff]
> pci_bus 0000:01: resource 1 mem: [0xfc100000-0xfc1fffff]
> pci_bus 0000:01: resource 3 io: [0x00-0xffff]
> pci_bus 0000:01: resource 4 mem: [0x000000-0xffffffffffffffff]
> pci_bus 0000:06: resource 0 io: [0x4000-0x4fff]
> pci_bus 0000:06: resource 1 mem: [0xf8000000-0xfbffffff]
> pci_bus 0000:04: resource 1 mem: [0xfc000000-0xfc0fffff]
>
> The extra resources in the old dmesg could be from "pci=use_crs"
> being the default, but if that were the case, they should be in
> the PNP resource dump. Did you update the BIOS between those
> boots?

No new BIOS. I'm still running the one that was in the machine when I
bought it. Do you want me to boot with "pci=use_crs"?

Larry





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