Messages in this thread | | | Date | Mon, 26 Nov 2007 11:52:41 -0500 | From | Chris Snook <> | Subject | Re: [2.6.22.y][PATCH] atl1: disable broken 64-bit DMA |
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Jay Cliburn wrote: > atl1: disable broken 64-bit DMA > > [ Upstream commit: 5f08e46b621a769e52a9545a23ab1d5fb2aec1d4 ] > > The L1 network chip can DMA to 64-bit addresses, but multiple descriptor > rings share a single register for the high 32 bits of their address, so > only a single, aligned, 4 GB physical address range can be used at a time. > As a result, we need to confine the driver to a 32-bit DMA mask, otherwise > we see occasional data corruption errors in systems containing 4 or more > gigabytes of RAM. > > Signed-off-by: Jay Cliburn <jacliburn@bellsouth.net> > Cc: Luca Tettamanti <kronos.it@gmail.com> > Cc: Chris Snook <csnook@redhat.com>
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