Re: PCI-DMA: Out of IOMMU space on x86-64 (Athlon64x2), with solution

[Andi Kleen]

On Friday 03 March 2006 23:23, Jeff Garzik wrote:
> Andi Kleen wrote:
> > On Friday 03 March 2006 22:27, Allen Martin wrote:
> >>nForce4 has 64 bit (40 bit AMD64) DMA in the SATA controller.  We gave
> >>the docs to Jeff Garzik under NDA.  He posted some non functional driver
> >>code to linux-ide earlier this week that has the 64 bit registers and
> >>structures although it doesn't make use of them.  Someone could pick
> >>this up if they wanted to work on it though.
> >
> > Thanks for the correction. Sounds nice - hopefully we'll get a driver
> > soon. I guess it's in good hands with Jeff for now.
>
> I'll happen but not soon.  Motivation is low at NV and here as well,
> since newer NV is AHCI.  The code in question, "NV ADMA", is essentially
> legacy at this point 

NForce4s are used widely in new shipping systems so I wouldn't
exactly call them legacy.

> -- though I certainly acknowledge the large current 
> installed base.  Just being honest about the current state of things...

How much work would it be to finish the prototype driver you have? 

-Andi
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