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    SubjectRe: IDE problem: linux-2.5.17
    On Thu, May 23, 2002 at 04:27:39PM +0200, Martin Dalecki wrote:
    >
    > > hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
    > > hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
    > > hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
    > > hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
    > > hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
    > > hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
    > > hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
    > > hda: dma_intr: error=0x84 { DriveStatusError BadCRC }
    >
    > Since this error can be expected to be quite common.
    > Its an installation error. I will just make the corresponding
    > error message more intelliglible to the average user:
    >
    > hda: checksum error on data transfer occurred!
    >
    > Would have hinted you propably directly at what's wrong.

    There is a routine in the IDE code to decrease transfer speed in case of
    these problems. And it is there for a good reason - many (namely UDMA66)
    mainboards have incorrectly wired IDE traces and can never achieve full
    UDMA speeds, and there is no way to know.

    For that I've also created UDMA_SLOW, which is even slower than UDMA_0
    (16.6 MB/sec), which still has CRC protection, and needs even less
    physical bandwidth than PIO4.

    --
    Vojtech Pavlik
    SuSE Labs
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