Intel's management engine is built on their Quark architecture now, and runs Minix 3. Doesn't seem like Intel is likely to change this any time soon, as the previous architecture they used was a real odd duck and Quark seems like a much better fit. So it's likely to ship in every Intel machine for the foreseeable future.
I had the same issue - iirc it's a 486 with some Pentium extensions. It has enough of the 586 set to fool you into thinking it is one, but not enough to fool glibc. So you need to have glibc specifically built for i486 otherwise life gets dark.
