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

Jeff Garzik 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...  :/

..

Yeah, that one's always puzzled me.
It's just software,  so why don't we do it?  In the PCI layer, that is?
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