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

Jeff Garzik
2007-11-10T03:05:27Z

Alan Cox wrote:
> On Thu, 8 Nov 2007 22:46:22 -0500
> Jeff Garzik <jeff@garzik.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

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.

Jeff