Hi, There is no runtime option to enable AHCI support (..although it would be nice).
If the BIOS doesn't provide the ability to configure this, your only recourse is to modify the ahci.c driver and force attach on this specific device. Last month I posted a diff for someone else, although it didn't appear to help him. http://marc.info/?t=126477757500001&r=1&w=2 It is possible however that the controller does not support AHCI, and it isn't guaranteed to solve any performance problems. -Bryan.
