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Date:	Mon, 25 Jun 2007 18:00:39 -0500
From:	Jay Cliburn <>
To:	Chris Snook <>
Cc:	"Jay L. T. Cornwall" <>,
	Luca Tettamanti <>,
	Jeff Garzik <>,,
Subject: Re: [PATCH] atl1: disable 64bit DMA

On Mon, 25 Jun 2007 17:57:20 -0400
Chris Snook <> wrote:

> Jay L. T. Cornwall wrote:
> > Chris Snook wrote:
> > 
> >> What boards have we seen this on?  It's quite possible this is:
> > 
> > I can reproduce on an Asus P5K with a Core 2 Duo E6600.
> > 
> > lspci identifies the controller as:
> >   02:00.0 Ethernet controller: Attansic Technology Corp. L1 Gigabit
> >   Ethernet Adapter (rev b0)
> > 
> > dmesg notes the PCI-DMA mapping implementation:
> >   PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
> > 
> I had a hunch this was on Intel.  I'd rather just disable this when
> swiotlb is in use, unless we get more complaints.  It's probably
> ultimately a BIOS quirk anyway.

So far we have reports from both camps:

Asus M2N8-VMX (AM2):	1 report of lockup

Asus P5K (LGA775):	2 reports of lockups

The common denominator in these reports is 4GB RAM.
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