Date: Tue, 24 Jan 2006 09:51:09 -0500
From: Jeff Garzik <jgarzik@pobox.com>
To: Ed Sweetman <safemode@comcast.net>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: Re: 2.6.16-rc1-mm2 pata driver confusion
Message-ID: <20060124145109.GC23269@havoc.gtf.org>
References: <43D5CC88.9080207@comcast.net>
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On Tue, Jan 24, 2006 at 01:43:20AM -0500, Ed Sweetman wrote:
> I have an nforce4 based motherboard.  Currently i'm using the amd/nvidia 
> driver under the normal ide,ata driver section (2.6.14). 
> 
> It appears that the new ata code is hiding under scsi/sata drivers, 
> including apparently pata code.  This alone reads confusing, pata 

libata PATA support is under development.  Use only if you feel lucky.
Really lucky.  I mean, really really lucky.


> 1.  Atapi is most definitely not supported by libata, right now.

Not true.


> 2. whether libata sets the controller up better or not, ide cdroms MUST 
> be loaded before libata is or the ide controller will be detected as 
> "already in use" and the cdrom drivers wont have any device to attach 
> to, since unlike scsi drivers, ide drivers dont probe the hardware on 
> controllers to see if any driver has claimed them.

Either use drivers/ide or libata for PATA, not both.


> 3. For hdd's alone, the pata libata + sata drivers are a "complete" 
> replacement for the ide drivers and thus, if you dont have atapi 
> devices, you dont need to compile in ide support.

Again, ATAPI works just fine.


> 4.  moving to pata libata drivers _will_ change the enumeration of your 
> sata devices, it seems that pata is initialized first, so when setting 
> up your fstab entries and grub, you'll have to take into account how 
> many pata devices you have and offset your current sata device names by 
> that amount.

Enumeration of devices depends on which driver is loaded first.
Check your /etc/modprobe.conf.

	Jeff


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