Messages in this thread | | | Date | 6 Jan 2004 11:49:04 +0100 | Date | Tue, 6 Jan 2004 11:49:04 +0100 | From | Andi Kleen <> | Subject | Re: PCI memory allocation bug with CONFIG_HIGHMEM |
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On Tue, Jan 06, 2004 at 12:16:14PM +0200, Mika Penttil? wrote: > But AGP aperture is controlled with the standard APBASE pci base > register, so you always know where it is, can relocate it and reserve > address space for it. Of course there may exist other uncontrollable hw, > which may cause problems.
Actually not. There are quite a lot of chipsets that require special programming for the AGP aperture (why do you think drivers/char/agp/*.c is so big?). And not even everything AGPv2 compliant.
And as Linus points out you would likely need to do some Northbridge specific magic to make that area usable for PCI then.
Also you would need to put it over RAM because again there is no reliable way to find a hole.
-Andi
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