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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" <> writes:
> > On Fri, 12 Dec 2003, [iso-8859-1] Måns Rullgård wrote:
> >
> >> Dale Mellor <> 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.

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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