Re: [PARPORT] ECP mode transfers in 2.4.x kernels

From: Philip Blundell (
Date: Mon Sep 10 2001 - 17:37:32 EDT

  • Next message: Frederic Villeneuve: "[PARPORT] which"

    >I think at least for now I think I'm just going to turn DMA off. I'm
    >still open to trying other experiments, though, if anybody wants to
    >suggest something.

    I guess it would be instructive to know how the corruptions correspond to
    invocations of parport_pc_fifo_write_block_dma. If you feel like hacking that
    function around a bit, how about adding a flag that gets set when the "DMA
    write timed out" condition happens; if the flag is set on entry to the
    function, dump out the first few bytes in `buf' to the console and clear the
    flag again.

    I'm slightly suspicious that there might be a hardware flaw in either your DMA
    controller or your parallel port. If you have another computer with a
    different chipset available, it would be interesting to know whether you can
    make the same thing happen.


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