Re: [PATCH] atl1: disable 64bit DMA

[Jeff Garzik]

Jay Cliburn wrote:
> On Mon, 25 Jun 2007 17:57:20 -0400
> Chris Snook <csnook@xxxxxxxxxx> 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
> http://sourceforge.net/mailarchive/forum.php?thread_name=46780384.063603.26165%40m12-15.163.com&forum_name=atl1-devel
>
> Asus P5K (LGA775):	2 reports of lockups
> http://sourceforge.net/mailarchive/forum.php?thread_name=467E7E34.4010603%40gmail.com&forum_name=atl1-devel
> http://lkml.org/lkml/2007/6/25/107
>
> The common denominator in these reports is 4GB RAM.

Although its possible this device doesn't really support 64-bit, it's 
more likely that this is a platform problem of some sort, or a driver 
bug of some sort.  In the driver, maybe it has a problem when you 
-cross- a 4GB boundary, which is not uncommon.

	Jeff



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