Re: [Xen-devel] [PATCH] Make AMD GART work as a mini IOMMU [2/4]

[Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>]

On Mon, 5 Mar 2007 15:05:48 -0600
"Langsdorf, Mark" <mark.langsdorf@xxxxxxx> wrote:

> Every AMD processor has an AGP aperture and 
> Graphics Address Transalation Table (GART) built
> into its Northbridge. 

And about half the chipsets show subtle data corruption problems under
Linux when you use it as an IOMMU. The Linux side code has various
workarounds for some chips, and skips using it on VIA, plus there is
ongoing AMD/NVidia investigation of problems with NV chipsets.

I can't see any of the errata stuff in this code - does it actually work
on every case like the VIA chipsets or not ?


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