Re: [PARPORT] figuring out an ECP port problem

From: Tim Waugh (
Date: Thu May 01 2003 - 04:32:45 EDT

  • Next message: Bret Comstock Waldow: "Re: [PARPORT] figuring out an ECP port problem"

    On Wed, Apr 30, 2003 at 09:26:03PM -0400, Bret Comstock Waldow wrote:

    > [bret@ganesha learning]$ cat /proc/sys/dev/parport/parport0/modes
    > The first three settings correspond to the settings in the BIOS. I'm
    > not sure about the last.

    As the documentation will tell you, 'modes' indicates the modes that
    the kernel is willing to use for transfers; in particular, it is NOT
    just 'what the BIOS can do'. For example, the BIOS may have ECP
    support, but the kernel may be compiled without support for hardware

    > Should the response for ECP be PCSPP,TRISTATE,ECP? It's not, and VMware
    > reports on start-up that the parallel port doesn't support ECP mode and
    > won't be used.

    VMware checks the BIOS, not the parport 'modes' file, since it uses
    direct inb/outb calls not the kernel for its parallel port transfers.
    If it is still checking the 'modes' file then it is a bug. Perhaps
    you have an old version of VMware?


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