Re: [PATCH] atl1: disable 64bit DMA

[Chris Snook]

Jeff Garzik wrote:
> 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

I'm going on the record to say I don't trust the chipsets on these boards, and 
I'd like anyone having these problems to let us 
(atl1-devel@xxxxxxxxxxxxxxxxxxxxx) know if they encounter similar problems with 
any other hardware.  That said, I'm not going to stand in the way of stability 
just because it *might* be someone else's fault.  I don't think limiting 
ourselves to dma32, at least while we track this down, is much of a loss on 
current hardware.

Acked-By: Chris Snook <csnook@xxxxxxxxxx>
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