Howto enable AHCI Mode MacBookPro1,2 and MacBookPro4,1

I added this after insmod ext2 in grub:

setpci -s 0:1f.2 90.b=40

This sets Intel ICH7 (page 509) or ICH8 (page 486) controller into AHCI mode.

A similar command will probably work for other ICHx devices.

I got my bus:slot.function from running lspci - take value from line that states SATA IDE mode

eg.

00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [IDE mode] (rev 02)

Both MBP1,2 and MBP4,1 have same bus:slot.function and use same value (40h) to put controller into AHCI mode.

UPDATE: Should be MacBookPro1,2 not MacBookPro2,1