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Date: Mon, 28 Oct 1996 17:32:46 -0800 (PST)
From: Doug White <dwhite@gdi.uoregon.edu>
Reply-To: dwhite@resnet.uoregon.edu
To: Charlie ROOT <root@k7.datadesign.com>
cc: questions@freebsd.org
Subject: Re: can't find modem on 03e8, irq 5
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On Mon, 28 Oct 1996, Charlie ROOT wrote:

> > 2.  IRQ 5 must not be used by another device.  Make sure it is free.

> Can you explain this? please.

Every device in the system that uses an IRQ (interrupt request) must use a
unique one under FreeBSD.  This means that if you want to access your
serial port at base 0x3e8 and IRQ 5, no other device can be configured to
use either port 0x3e8 nor IRQ 5.  You cannot share IRQs with
exceptions for multi-port adapters.

Many sound cards use irq 5 by default; make sure yours isn't.

Doug White                              | University of Oregon  
Internet:  dwhite@resnet.uoregon.edu    | Residence Networking Assistant
http://gladstone.uoregon.edu/~dwhite    | Computer Science Major