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    SubjectRe: PROBLEM: floppy motor spins when floppy module not installed
    On Fri, 12 Dec 2003, [iso-8859-1] Måns Rullgård wrote:

    > "Richard B. Johnson" <root@chaos.analogic.com> writes:
    >
    > > On Fri, 12 Dec 2003, [iso-8859-1] Måns Rullgård wrote:
    > >
    > >> Dale Mellor <dale@dmellor.dabsol.co.uk> writes:
    > >>
    > >> > 1. Floppy motor spins when floppy module not installed.
    > >>
    > >> It's a known problem. Some broken BIOSes don't turn off the motor
    > >> after probing for a disk. One solution is to change the boot priority
    > >> in the BIOS settings so the hard disk is tried before floppy. If you
    > >> ever need to boot from a floppy, you can change it back.
    > >
    > > It is not a broken BIOS! The BIOS timer that ticks 18.206 times
    > > per second has an ISR that, in addition to keeping time, turns
    > > OFF the FDC motor after two seconds of inactivity. This ISR is taken
    > > away by Linux. Therefore Linux must turn off that motor! It is a
    > > Linux bug, not a BIOS bug. Linux took control away from the BIOS
    > > during boot.
    >
    > OK, but why doesn't it affect all machines?
    >
    If you leave the FDC software in the kernel, the FDC software
    sets up everything and turns off the motor. If you have the
    FDC as a module, you have nothing in there to turn off the
    motor until you install the module.

    Cheers,
    Dick Johnson
    Penguin : Linux version 2.4.22 on an i686 machine (797.90 BogoMips).
    Note 96.31% of all statistics are fiction.


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