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

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Date:	Sat, 10 Nov 2007 00:32:15 +0100
From:	Matthias Schniedermeyer <ms@...d.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Jeff Garzik <jeff@...zik.org>, 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

On 09.11.2007 12:04, Alan Cox wrote:
> On Thu, 8 Nov 2007 22:46:22 -0500
> Jeff Garzik <jeff@...zik.org> wrote:
> 
> > On Thu, Nov 08, 2007 at 10:29:37PM -0500, Mark Lord wrote:
> > > And I might even privately patch my own kernels to map the ACHI BAR
> > > in the cases where the BIOS didn't...
> > 
> > The inability to do this in the general case is the main reason why
> > AHCI was not unconditionally enabled, even in IDE mode, when it was
> > originally added...  :/
> 
> We've done it all the time for various devices without problems (eg S3
> video cards). I'd like to see it go in - although perhaps attached to a
> force_ahci boot param initially

I second that.

My computer/mainboard @work has such a "broken" BIOS. Of the 5 
SATA-Ports this MB has only 1 (and 1 "missing" that is reported by linux 
but i can't find on the MB) is configured as AHCI which means that with 
a HDD & a DVD-ROM connected to 2 of the 4 "piix"-ports, i only have 1 
hot-pluggable port instead of the possible 3. And for some temporary 
work i would really need at least 2 hot-pluggable ports.

So as a work-around i will try a Promise 150 TX4 controller as it is 
supposed to support hotplug since 2.6.23.

After having hotplug @home from the date the linux-kernel supporting it 
was released, i don't want to live without it, as i use it daily.

And on the topic of "broken" BIOSes. I have a little empathy for the MB 
manufactures as non-RAID AHCI royaly screws Windos, so not supporting it 
reduces their support costs enough to overlook screwing the non-windos 
faction.

Bis denn

-- 
Real Programmers consider "what you see is what you get" to be just as 
bad a concept in Text Editors as it is in women. No, the Real Programmer
wants a "you asked for it, you got it" text editor -- complicated, 
cryptic, powerful, unforgiving, dangerous.

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