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SubjectRe: PCI-DMA: Out of IOMMU space on x86-64 (Athlon64x2), with solution
Date
On Friday 03 March 2006 09:16, Chris Wedgwood wrote:
> On Thu, Mar 02, 2006 at 02:03:48AM +0100, Andi Kleen wrote:
>
> > Nvidia hardware SATA cannot directly DMA to > 4GB, so it has to go
> > through the IOMMU.
>
> do you know if that is an actual hardware limitation or simply a
> something we don't know how to do for lack of docs?

I assume that's a hardware limitation. I guess they'll move to AHCI
at some point though - that should fix that.

>
> > And in that kernel the Nforce ethernet driver also didn't do >4GB
> > access, although the ethernet HW is theoretically capable.
>
> hrm, again, with a lack of docs is that likely to occur anytime soon?

That has been already fixed, just not in the kernel version Michael
is using.

-Andi
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