Now, that is weird. I also cannot boot a 2.4.20 kernel, but with totally
different symptoms. It seems that the kernel doesn't read any boot
parameters off MILO and then panics after trying to mount some unsuitable
device as root partition. Again, the 2.4.19 kernel works fine; the only
difference in configuration is a "make oldconfig" that didn't come up with
any options that seemed relevant here.
That makes me ask: did anybody manage to run a 2.4.20 kernel yet on alpha?
What's the trick? ;-)