[coreboot] Asus KGPE-D16 with latest coreboot errors with Unsupported Hardware on Qubes 4 install missing IOMMU?

[Nico Huber]

On 03.12.18 11:35, Felix Held wrote:
>> No idea why combined mode is the default, it's only useful for OSes from
>> the '90s. It's not about the type of drives (SATA vs PATA) connected but
>> how the SATA controller identifies itself to the OS.>
> I agree that the combined mode isn't the best default, but I can't say
> that it's totally useless. In combined mode you have the first 4(?) SATA
> ports connected to an AHCI controller and the last 2(?) to a legacy
> IDE/ATA controller. I had some SATA->PATA bridge to connect a PATA
> device to a mainboard and the adapter I had only worked on SATA ports
> that were connected to a legacy IDE/ATA controller, but not on SATA
> ports connected to an AHCI controller. I didn't further debug that issue
> though, so I can't say why it didn't work on an AHCI controller.

Interesting use case. I missed that the combined mode is also the only
mode where you have SATA ports on AHCI and the legacy interface.

I also don't know if an IDE drive should work with AHCI. My guess would
be yes, but OS drivers probably don't expect it.

Nico