Re: PCI resources above 4GB

[Steven Newbury <steve@xxxxxxxxxxxxxxx>]

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On 10/04/12 21:45, Yinghai Lu wrote:
> On Tue, Apr 10, 2012 at 1:26 PM, Steven Newbury
> <steve@xxxxxxxxxxxxxxx> 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...
> 
>> 
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.

>> 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
> 
> Please apply attached patch in addtition to allocate_high_at_first
> 
I'll try first thing tomorrow.  I'm away from the docking station now.
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