PCI resources above 4GB

Yinghai Lu yinghai at kernel.org
Wed Apr 11 17:57:17 PDT 2012

On Tue, Apr 10, 2012 at 2:19 PM, Steven Newbury <steve at snewbury.org.uk> wrote:
> Another thought, normally the integrated graphics has an "AGP"
> aperture of 256M @0xe0000000, which is detected by agpgart-intel, this
> will need to be moved up above 4G to free up 0xe0000000 for the
> radeon, assuming the "agp_bridge" has a 64bit base register...  I
> noticed in my docked dmesg, "AGP aperture is 256M @ 0x20000000", but
> the PCI base: "120000000-12fffffff : 0000:00:02.0" so only 32bits have
> been set in agpgart-intel.  Explains why i915 wasn't initialised.

Attached patch should fix that high 32bit missing problem.

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