Re: [2.6.22.y][PATCH] atl1: disable broken 64-bit DMA

Chris Snook
2007-11-26T16:58:16Z

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>

Acked-By: Chris Snook <csnook@redhat.com>