Hi, > > > > Given newer processors have more than 40 and for older ones we know > > > > the possible values for the two relevant x86 vendors we could do > > > > something along the lines of: > > > > > > > > phys-bits >= 41 -> valid > > > > phys-bits == 40 + AuthenticAMD -> valid > > > > phys-bits == 36,39 + GenuineIntel -> valid > > > > everything else -> invalid > I dropped the patch for now. You can drop it forever. For the mail archives and anyone interested: The approach outlined above appears to work well, patches just landed in edk2 master branch. Next edk2 stable tag (2022-11) will have it. take care, Gerd