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Date:      Fri, 23 Mar 2001 11:00:05 -0800 (PST)
From:      Soren Schmidt <sos@freebsd.dk>
To:        freebsd-bugs@FreeBSD.org
Subject:   Re: kern/26031: 4.3-BETA crashes on 'mount /dev/acd0c /mnt/cd'
Message-ID:  <200103231900.f2NJ05I09687@freefall.freebsd.org>

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The following reply was made to PR kern/26031; it has been noted by GNATS.

From: Soren Schmidt <sos@freebsd.dk>
To: davidt@yadt.co.uk (David Taylor)
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/26031: 4.3-BETA crashes on 'mount /dev/acd0c /mnt/cd'
Date: Fri, 23 Mar 2001 19:58:50 +0100 (CET)

 It seems David Taylor wrote:
 > On Fri, 23 Mar 2001, Soren Schmidt wrote: 
 > > 
 > > You should disable DMA on the CDROM, then get back with the
 > > result....
 > 
 > # sysctl hw.atamodes
 > hw.atamodes: dma,---,dma,dma,
 > 
 > # sysctl -w hw.atamodes="dma,---,pio,pio"
 > hw.atamodes: dma,---,pio,pio, -> dma,---,pio,pio,
 > 
 > # mount /dev/acd0c /mnt/dvd/
 > mount: /dev/acd0c on /mnt/dvd: incorrect super block
 > 
 > (which I presume is the correct behaviour)
 
 Yups, you got yet another drive/controller combo that cant do 
 ATAPI DMA proberly...
 
 -Søren

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