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    SubjectRe: [PATCH] atl1: disable 64bit DMA
    On 6/26/07, Jeff Garzik <jgarzik@pobox.com> wrote:
    > Jay Cliburn wrote:
    > > On Mon, 25 Jun 2007 17:57:20 -0400
    > > Chris Snook <csnook@redhat.com> 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.

    I don't follow you :| What kind "common" mistakes should we check for
    in the driver?

    Luca
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