From owner-freebsd-stable  Tue Apr 30 13: 1:26 2002
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Subject: Re: ata (cd) troubles
From: Joe Marcus Clarke <marcus@marcuscom.com>
To: Chris Pockele <chrisp@belgacom.net>
Cc: Christopher Hall <hsw@acm.org>, stable@FreeBSD.ORG
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On Tue, 2002-04-30 at 16:36, Chris Pockele wrote:
> On Tue, Apr 30, 2002 at 09:01:21AM +0800, Christopher Hall wrote:
> > 
> > There are several threads that show similar problems with acd, and
> > there is a PR
> > 
> > i386/37420: Copying large files from an IDE CD-ROM to a harddrive
> >  causes a system lock-up.
> > 
> > Some have had success by using atacontrol to change drive to dma mode.
> > This only reduces the frequency of the problem in my case.
> >
> Well, I've done that and it seems to help.  No crash yet - although I haven't
> done really extensive testing yet.  Anyway, the bug is still there - if I
> can do anything to help, just ask :).
> 
> What is the difference between the mode setting (atacontrol) and the dma
> sysctl?  Is the sysctl some default value?  I enabled dma with atacontrol:
> 
> # atacontrol mode 1
> Master = WDMA2 
> Slave  = WDMA2
> 
> # sysctl -a | grep dma
> hw.ata.ata_dma: 1
> hw.ata.atapi_dma: 0
> 
> (still says 0 ?)
> The (ata) manpage is a bit unclear on this subject, how should this "sysctl"
> be changed? 

Add this to /boot/loader.conf:

hw.ata.atapi_dma=1

Works for me on my Dell Inspiron 8100.  I have my DVD-ROM as a UDMA 33
device.

Joe

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