Re: [PATCH 0/2] x86/PCI: enable pci=use_crs for more machines
From: Bjorn Helgaas
Date: Wed Jun 17 2015 - 19:03:29 EST
On Tue, Jun 16, 2015 at 11:55 AM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote:
> We have a few reports of sound devices not working because the BIOS didn't
> assign space for the device and the PCI core put it at an address that
> doesn't work.
> The Foxconn system has two PCI host bridges, and without the information
> from _CRS, the PCI core assigns space under the wrong bridge.
> We also have reports from pre-2008 systems (where we normally ignore _CRS)
> that support more than 32 physical address bits. After d56dbf5bab8c ("PCI:
> Allocate 64-bit BARs above 4G when possible"), we prefer to use that high
> space when we can, but it seems the host bridge doesn't respond to it.
> _CRS tells us how to avoid both problems, so these patches enable it for
> these cases.
> Bjorn Helgaas (2):
> x86/PCI: Use host bridge _CRS info on Foxconn K8M890-8237A
> x86/PCI: Use host bridge _CRS info on systems with >32 bit addressing
I applied both patches to pci/resource for v4.2.
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