From: mru@kth.se (Måns Rullgård)
To: linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: floppy motor spins when floppy module not installed
Date: Fri, 12 Dec 2003 16:33:57 +0100 [thread overview]
Message-ID: <yw1xr7zaxd7e.fsf@kth.se> (raw)
In-Reply-To: Pine.LNX.4.53.0312121018450.10945@chaos
"Richard B. Johnson" <root@chaos.analogic.com> writes:
> On Fri, 12 Dec 2003, [iso-8859-1] Måns Rullgård wrote:
>
>> "Richard B. Johnson" <root@chaos.analogic.com> writes:
>>
>> > 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.
IMHO a ridiculous design, as is most of the PC.
>> > 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.
I'm running 2.6.0-test11 on a machine with modular floppy driver,
without any spinning motors. I think it boots from floppy before HD,
but I'm not certain (can't check right now).
--
Måns Rullgård
mru@kth.se
next prev parent reply other threads:[~2003-12-12 15:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-12 13:57 PROBLEM: floppy motor spins when floppy module not installed Dale Mellor
2003-12-12 14:18 ` Måns Rullgård
2003-12-12 15:04 ` Richard B. Johnson
2003-12-12 15:11 ` Måns Rullgård
2003-12-12 15:20 ` Richard B. Johnson
2003-12-12 15:33 ` Måns Rullgård [this message]
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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