[coreboot] Re: AM1I-A and other 16h Jaguar boards cant have a working IOMMU

[Sirsquishy]

This has been an issue since before AM2+, but AM2+ is when I first started
to deal with it. For AMD IOMMU does not fully work behind the DMI. If you
break out IOMMU from the CPU lanes You can generally get it working anyway
you want. But if you try and  break out DMI attached devices (PCIE,
Onboard, other) the Groups are generally broken and do not work. Have tried
this with many HyperVisors and some will just give up the ghost after a
while due to sharing violations. So this is not exactly new and I wouldnt
expect a proper fix.