From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265245AbTLLPeE (ORCPT ); Fri, 12 Dec 2003 10:34:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265249AbTLLPeE (ORCPT ); Fri, 12 Dec 2003 10:34:04 -0500 Received: from main.gmane.org ([80.91.224.249]:19875 "EHLO main.gmane.org") by vger.kernel.org with ESMTP id S265245AbTLLPeB (ORCPT ); Fri, 12 Dec 2003 10:34:01 -0500 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: mru@kth.se (=?iso-8859-1?q?M=E5ns_Rullg=E5rd?=) Subject: Re: PROBLEM: floppy motor spins when floppy module not installed Date: Fri, 12 Dec 2003 16:33:57 +0100 Message-ID: References: <16345.51504.583427.499297@l.a> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Complaints-To: usenet@sea.gmane.org User-Agent: Gnus/5.1002 (Gnus v5.10.2) XEmacs/21.4 (Rational FORTRAN, linux) Cancel-Lock: sha1:CHMroTDhQb7VaI61Paa8r4xHYH8= Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org "Richard B. Johnson" writes: > On Fri, 12 Dec 2003, [iso-8859-1] Måns Rullgård wrote: > >> "Richard B. Johnson" 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