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Message-ID: <44189A3D.5090202@garzik.org>
Date: Wed, 15 Mar 2006 17:50:37 -0500
From: Jeff Garzik <jeff@garzik.org>
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To: Ingo Molnar <mingo@elte.hu>
CC: "Bill Rugolsky Jr." <brugolsky@telemetry-investments.com>,
       Andi Kleen <ak@suse.de>, Lee Revell <rlrevell@joe-job.com>,
       Jason Baron <jbaron@redhat.com>, linux-kernel@vger.kernel.org,
       john stultz <johnstul@us.ibm.com>
Subject: Re: libata/sata_nv latency on NVIDIA CK804 [was Re: AMD64 X2 lost
 ticks on PM timer]
References: <200602280022.40769.darkray@ic3man.com> <4408BEB5.7000407@garzik.org> <20060303234330.GA14401@ti64.telemetry-investments.com> <200603040107.27639.ak@suse.de> <20060315213638.GA17817@ti64.telemetry-investments.com> <20060315215020.GA18241@elte.hu> <20060315221119.GA21775@elte.hu> <44189654.2080607@garzik.org> <20060315224408.GC24074@elte.hu>
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Ingo Molnar wrote:
> * Jeff Garzik <jeff@garzik.org> wrote:
> 
> 
>>It won't work at all...
> 
> 
> ok.
> 
> 
>>You have to stop talking to PCI IDE registers completely (consumes 5 
>>PCI BARs), and talk exclusively to the MMIO 6th PCI BAR, at 
>>non-standard offsets and a using a proprietary DMA descriptor format 
>>[all public now in that link I just sent].
> 
> 
> just to make it easier to test: i've attached the new sata_nv.c file, 
> which, to test it, should be copied over the existing 
> drivers/scsi/sata_nv.c file, correct?

Alas, it is far from that simple :(

The code I linked to isn't in a working state.  NV contributed it 
largely as "it worked at one time" documentation of a 
previously-undocumented register interface.

Someone needs to debug it.

	Jeff