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From: Jung-uk Kim <jkim@FreeBSD.org>
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Date: Thu, 9 Apr 2009 11:35:50 -0400
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Cc: Kurt Jaeger <lists@c0mplx.org>, Alexander Motin <mav@freebsd.org>,
	Diego Depaoli <trebestie@gmail.com>
Subject: Re: AMD 780G chipset major issues 1/3 (ata, ataati)
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On Wednesday 08 April 2009 04:32 am, Alexander Motin wrote:
> Diego Depaoli wrote:
> > On Tue, Apr 7, 2009 at 10:12 PM, Alexander Motin <mav@freebsd.org> 
wrote:
> >> Kurt Jaeger wrote:
> >>>>> 2 -> with ataati loaded as module
> >>>
> >>> [...]
> >>>
> >>>>> ad4: 305245MB <SAMSUNG HD321KJ CP100-11> at ata2-master
> >>>>> SATA300 ad6: 305245MB <SAMSUNG HD321KJ CP100-12> at
> >>>>> ata3-master SATA300
> >>>>>
> >>>>> my sata disks are right, but ata1 and acd0 vanished
> >>>>
> >>>> Is your DVD drive SATA or PATA?
> >
> > It's PATA
>
> According to what I have found on the net, this chipset has 6 SATA
> and one PATA ports. When you are disabling ataati driver ATA
> controllers work in legacy ATA emulation mode, which emulates 8
> possible devices access via 4 legacy PATA channels.
>
> ataati driver loading switches first controller into native AHCI
> mode, which for some reason gives you only four ports, not six, may
> be last two are still under the legacy emulation. And disables
> second port on PATA controller, which actually should not be there,
> but looks like present, according to common driver operation.
>
> I would say that there is some misconfiguration between BIOS ATA
> emulation settings and ataati driver expectations. Is there any
> switches like Native/AHCI/RAID/Legacy in your BIOS settings? Have
> you tried to play with them?

We have to fix many things but you can take a look at the following 
Linux patches:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/195354

Jung-uk Kim