RE: [Xen-devel] allocating AGP aperture memory

["Langsdorf, Mark" <mark.langsdorf@xxxxxxx>]

> > > However, if I don't have AGP support working, I need to 
> program the 
> > > Northbridge registers with the physical address of the GATT (see 
> > > init_k8_gatt() in
> > arch/xen/x86_64/kernel/pci-gart.c).
> > > Just doing a __pa() obviously doesn't return meaningful data,
> > > which is to be expected.  How should dom0 go about getting it?
> > 
> > You need to allocate the gatt mapping table using alloc_gatt_pages
> > (dma_alloc_coherent) rather than get_free_pages.
> > 
> > You then want to use virt_to_gart on the address returned.
> 
> Are you sure?  I've been trying this for days, and it
> isn't working.

Never mind.

There were a bunch of references to virt_to_phys() that
should have been virt_to_bus().

Moving on to the next problem...

-Mark Langsdorf
AMD, Inc.


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