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

From: Dave Strauss (D.Strauss@motorola.com)
Date: Fri Aug 17 2001 - 10:30:21 EDT

  • Next message: Dave Strauss: "Re: [PARPORT] ECP mode transfers in 2.4.x kernels"

    On Fri, 17 Aug 2001 15:20:38 +0100, Tim Waugh <twaugh@redhat.com> wrote:
    >
    > [ ... ]
    >
    > > Other clues that dma is being used:
    > >
    > > dmesg
    > > [ ... ]
    > > lp0: using parport0 (interrupt-driven).
    >
    > THE clue is what parport_pc says when it loads. If it says ', dma
    > %d', then it knows that it can do DMA with this chipset, and will do
    > so. (Earlier I said to look for 'using FIFO', but that's wrong, and
    > means that parport_pc knows that the chipset can do PIO, and will use
    > it. At least in current kernels; I don't remember if this was
    > actually the case by 2.4.2-acX.)
    >
    Ah yes; here's the relevant line from dmesg:

    parport0: PC-style at 0x378 (0x778), irq 7, dma 3 [PCSPP,TRISTATE,COMPAT,EPP,ECP,DMA]

    This used to be:

    parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE,COMPAT,EPP,ECP]

    In my excitement I had missed the change.

    >
    > [ ... ]
    >

    -- Dave Strauss

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