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

From: Philip Blundell (philb@gnu.org)
Date: Fri Sep 07 2001 - 17:21:42 EDT

  • Next message: Ashley Moore: "Re: [PARPORT] which distro for an old i486 laptop"

    >It's interesting that in all cases 2 or 3 bytes are added, then 32
    >bytes later one is skipped.

    Yeah. Well, if I'm reading them right, you are always getting two bytes
    repeated and then, 32 bytes later, two bytes dropped. So:

    ***** 4226: 0a should be 32
    ******
    30,0a,31,32,33,34,35,36,37,38,39,30,0a,31,0a,
    0a <===
    31,32,33,34,35,36,37,38,39,30,0a,31,32,33,34
    ******

    here you've got `0a, 31' repeated, and

    ***** 4259: 31 should be 30
    ******
    37,38,39,30,0a,31,32,33,34,35,36,37,38,39,31
    31 <===
    32,33,34,35,36,37,38,39,30,0a,31,32,33,34,35
    ******

    here you've lost `30, 0a'.

    Remind me whether you see the same behaviour if you disable DMA but leave
    hardware assist enabled? (I.e. if you use parport_pc_fifo_write_block_pio.)

    p.



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