Re: HP backend problem...

From: Jens Petersohn (jkp@mccoy.penguinpowered.com)
Date: Thu Aug 10 2000 - 13:16:04 PDT

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    Hi Peter,

    thanks for the help. In the mean time I've tried several versions of the
    SCSI driver (.28, .29 and .30 -- latest), but no luck. I've tried your
    suggestion, and that seems to change the width of the "corruption"
    bars. I've poked around some more in the source code and attempting to
    analyze the debugging output, but my knowledge of SCSI and it's
    methods are non-existent.

    Is the PROM in the scanner old perhaps? Is it upgradable? The /proc/scsi/scsi
    entry says it's version

      Vendor: HP Model: C5110A Rev: 3638
      Type: Processor ANSI SCSI revision: 02

    Thanks,

    Jens

    >
    > Jens Petersohn wrote:
    > Hi Jens,
    >
    > I dont know how to solve the problem. But I think it must have something
    > to do with the SCSI interface. The image looks like some bytes have been
    > lost. Two of the strips in the image have exactly the same size of
    > 393216 Bytes == 384KB. One of strips is one byte more than 416KB. Both
    > values are multiple of 32KB. If you have the sources of the hp-backend,
    > you can try to change the value of HP_PIPEBUF in file hp-scl.c from
    > 32768 to 16384 or 4096. When the compilation was successful, you should
    > see the new value in the log file with the messages "entering request to
    > read num bytes" and "trying to read num bytes".
    > I am not sure if this solves the problem and if so why.
    >
    > --Peter 

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                                           -- (quoted by Eric Berggren)

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