From: "Richard B. Johnson" <root@chaos.analogic.com>
To: "Måns Rullgård" <mru@kth.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: floppy motor spins when floppy module not installed
Date: Fri, 12 Dec 2003 10:04:47 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.53.0312121000150.10423@chaos> (raw)
In-Reply-To: <yw1xd6auyvac.fsf@kth.se>
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.
>
> --
> Måns Rullgård
> mru@kth.se
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.
Cheers,
Dick Johnson
Penguin : Linux version 2.4.22 on an i686 machine (797.90 BogoMips).
Note 96.31% of all statistics are fiction.
next prev parent reply other threads:[~2003-12-12 15:03 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-12 13:57 Dale Mellor
2003-12-12 14:18 ` Måns Rullgård
2003-12-12 15:04 ` Richard B. Johnson [this message]
2003-12-12 15:11 ` Måns Rullgård
2003-12-12 15:20 ` Richard B. Johnson
2003-12-12 15:33 ` Måns Rullgård
2003-12-12 16:05 ` Petr Vandrovec
2003-12-12 16:27 ` Måns Rullgård
2003-12-12 16:41 ` Petr Vandrovec
2003-12-12 16:00 ` Matthew Kirkwood
2003-12-12 19:28 ` John Bradford
2003-12-12 19:47 ` Richard B. Johnson
2003-12-13 6:18 ` Joshua Schmidlkofer
2003-12-15 14:37 ` Richard B. Johnson
2003-12-13 10:40 ` John Bradford
2003-12-15 14:50 ` Richard B. Johnson
2003-12-15 20:24 ` John Bradford
2003-12-13 13:18 ` Helge Hafting
2003-12-13 16:42 ` Joshua Schmidlkofer
2003-12-12 14:59 ` Richard B. Johnson
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