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

[Felix Held]

Hi!


> 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.


Speaking of the KGPE-D16: I still have this patch [0] in my review queue 
that is needed for coreboot to work on the board when the BMC firmware 
flash is installed, but it seems that neither Timothy nor owners of that 
board really care about that patch any more (I poked a few people about 
that patch a few times), which I find quite sad. Would be good if 
someone would address the last 3 comments and actually tests the patch 
on the real hardware, so it can be merged to fix that show-stopper.


Regards

Felix


[0] https://review.coreboot.org/c/coreboot/+/19820