[Linaro-mm-sig] [RFC] ARM DMA mapping TODO, v1
alan at lxorguk.ukuu.org.uk
Fri Apr 29 11:56:13 UTC 2011
> I believe that the PC graphics cards that have noncoherent DMA mappings
> are all of the unified memory (integrated into the northbridge) kind,
> so they are not on the same host bridge as all regular PCI devices,
> even if they appear as a PCI device.
The AGP GART is not coherent on a lot of systems - not necessarily
unified memory though, it can be a plug in AGP card too.
The GART is basically an IOMMU (and indeed in the later AMD case used
exactly as that)
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