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Sender: Alexander Motin <mavbsd@gmail.com>
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Date: Thu, 24 Dec 2009 09:45:11 +0200
From: Alexander Motin <mav@FreeBSD.org>
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To: Diego Depaoli <trebestie@gmail.com>
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Cc: freebsd-current <freebsd-current@freebsd.org>
Subject: Re: ATA_CAM for extradummies
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Diego Depaoli wrote:
> Trying to rip a DVD with ogmrip which uses libdvd[read | nav | css] my
> system becomes unusable.
> Syslog repeats many and many times:
> ahcich0: port is not ready (timeout 10000ms) tfd = 00000480
> ahcich0: device ready timeout
> 
> ahci0: <ATI IXP700 AHCI SATA controller> port
> 
> I can only poweroff the machine since reboot hangs syncing the buffers.
> After restart, verbose dmesg causes kernel panic.

As soon as your DVD drive is on PATA channel, errors are not directly
related to ripping. I think it is related to device scanning before it.
I think libdvd tries to send SCSI commands to SATA disks, which is not
handled properly by IXP700 AHCI controller.

-- 
Alexander Motin