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

Alan Cox wrote:

On Thu, 8 Nov 2007 22:46:22 -0500
Jeff Garzik <[email protected]> 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


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