PATA port not detected when using AHCI on Intel 82801GB/GR/GH

What was the final outcome on this issue?

What kernel compile options need to be enabled to allow libata to drive this device?

Can DMA be enabled on this device?

I have an ss4200 running a custom compiled kernel running Fedora Core 12.

There's no workaround at the moment. The root cause is the BIOS seems to be broken and incorrectly disables the PCI device for the PATA controller when the SATA controller is set to AHCI mode.

A PCI quirk might be doable to forcibly re-enable the PATA controller so that ata_piix can drive it, depending on what exactly the BIOS has done to switch it off..