From: Andi Kleen <ak@suse.de>
To: Chris Wedgwood <cw@f00f.org>
Subject: Re: PCI-DMA: Out of IOMMU space on x86-64 (Athlon64x2), with solution
Date: Fri, 3 Mar 2006 12:00:12 +0100
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Cc: Michael Monnerie <m.monnerie@zmi.at>, linux-kernel@vger.kernel.org,
       suse-linux-e@suse.com
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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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