switching from legacy to ahci on intel ICH-7M?

[Alexander Motin]

Michael Butler wrote:
> My current laptop has an AHCI-capable disk controller and SATA disk but,
> it appears, the manufacturer has no interest in implementing AHCI in the
> BIOS.
> 
> Is there an example of how one might (re-)initialize the controller to
> take advantage of AHCI and the disk's NCQ capabilites somewhere?

Intel ICH7 datasheet? AFAIR it was described there.

Some other vendors allow enabling AHCI just via one of standard AHCI
registers, but Intel doesn't. If SATA is not configured as AHCI or RAID
by BIOS via custom register, standard AHCI registers are not available.

-- 
Alexander Motin