linux-kernel - Re: [PATCH] Add quirk to set AHCI mode on ICH boards

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Date:	Fri, 09 Nov 2007 22:57:28 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Theodore Tso <tytso@....edu>, Jeff Garzik <jeff@...zik.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Mark Lord <liml@....ca>,
	Riki Oktarianto <rkoktarianto@...il.com>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH] Add quirk to set AHCI mode on ICH boards

Theodore Tso wrote:
> On Fri, Nov 09, 2007 at 10:05:05PM -0500, Jeff Garzik wrote:
>> By forcing AHCI, your PATA devices will be inaccessible, in a common 
>> configuration.  It also means shuffling users from one driver to another, 
>> which induces breakage.
>>
>> I was speaking wishfully.  Real life intrudes, alas.
> 
> Not even as boot-time option?  I'm curious whether it might allow me
> to use AHCI mode on a T60p laptop; right now I can't because in AHCI
> mode the Ultrabay hard drive device becomes invisible to Linux
> (although not to Windows, interestingly).  I'm currently travelling
> and I don't carry the T60 around anymore, so I can't do the experiment
> right this moment, but given that this would allow the T60 to take
> advantage of ALPM if this works, it would be awfully tempting....

Oh sure, a boot-time option would be fine.

I want to spread AHCI far and wide; it is vastly superior to ata_piix in 
many ways.

I was mainly talking about unconditionally changing behavior from the 
current default, which presents several problems.

	Jeff



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