AIUI Sel4 is just a kernel, so adding all the "management engine crap" - networking stacks, drivers etc. would be a lot of work. Minix came with 'batteries' included.

As to why, no idea. I guess some engineer was just familiar with it from their undergrad days like the rest of us.

And which version, I know it’s MINIX 3 but beyond that? No idea. They probably heavily modified it and as Minix is not GPL, Intel never published it. Based on the timelines it’s likely 3.1 as the ME platform has heen around since approximately 2007 iirc.

> it’s likely 3.1 as the ME platform has heen around since approximately 2007

Then I guess it's one of the 3.1.3x versions released in 2007 (see https://github.com/Stichting-MINIX-Research-Foundation/minix...), or maybe 3.1.2 from 2006, depending how long hey had to implement the ME.

The original L4 (I believe) wasn't commercially available und sel4 is GPL licensed. Minix has a BSD license, so maybe that's why

100% because of the license

The original L4 was written in assembler and replaced by different other implementations long before the ME platform was developed. Pistachio was in development around that time and available under BSD.

Besides what others pointed out, Minix3 is engineered for fault tolerance foremost. seL4 has different goals.

Or Minix 2?