ahci and ICH7?

[Alexander Motin]

Stefan Bethke wrote:
> After being very satisfied with ahci(4) on an Intel DG45FC (G45 chipset) with 8-stable, I tried on a box with a Asus P-P5G41 (G41 chipset), but ahci is not attaching.  atapci continues to attach, and I'm wondering whether I'm doing something wrong, the BIOS is misconfigured, or ahci can't talk to ICH7-based AHCIs?  I'm loading ahci from loader.conf.

There are several types of ICH7. Most of them doesn't support AHCI mode.
Rare exceptions are ICH7R and ICH7M AFAIR. G41 is low-end desktop
chipset, which uses low-end ICH7 SB, so usually there is no luck.

> atapci1 at pci0:0:31:2:	class=0x01018f card=0x81791043 chip=0x27c08086 rev=0x01 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = '82801GB/GR/GH (ICH7 Family) Serial ATA Storage Controller'
>     class      = mass storage
>     subclass   = ATA

To make ahci(4) attach, you should have there subclass SATA or RAID. It
may depend on BIOS settings.

-- 
Alexander Motin