ACHI support

[Alan Cox]

> So in my case, is there a workaround to get it going?
> 
> 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller not detected on boot
> in Thinkpad T61

The ICH8M/M-E isn't known by the FC7 install kernel (its a tiny bit too
new)

Booting with ata_generic.all_generic_ide=1 as a boot option if the
controller is in non-AHCI mode may help, otherwise you need a newer
install image from someone.