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From: Steven Newbury <steve@snewbury.org.uk>
Reply-To: Steven Newbury <steve@snewbury.org.uk>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org
Subject: Re: PCI resources above 4GB
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Date: Wed, 11 Apr 2012 12:43:51 +0100
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On Tue, 10 Apr 2012, 21:45:54 BST, Yinghai Lu <yinghai@kernel.org> wrote:

> On Tue, Apr 10, 2012 at 1:26 PM, Steven Newbury <steve@snewbury.org.uk>
> wrote:
> > > 
> > So far I'm concluding the BIOS isn't sane.  Is it possible to define a
> > custom memory map from the linux boot cmdline to set TOP_OF_LOW_MEM?
> 
> The BIOS have MMIO and memory overlapping...
> 
> > 
> > Obviously, I'd prefer getting everything allocated into the address
> > space available, and working, but if it comes down to it I'd accept a
> > hack like the above if there's no other way.
> 
> Could try to reduce carbus preallocated size.... boot with
> pci=cbmemsize=16M

I've managed to get the radeon to work by turning off the cardbus controller in the BIOS setup.  I'll try the patch and the above parameter next.
> 
> Please apply attached patch in addtition to allocate_high_at_first

Btw, I've verified why the intel gfx isn't working, intel-agp.c only reads the lower 32bits of the aperture location.  It is definitely supported over 4G by the hardware, see my other email.