@ploum This one is pretty basic, but by following the links you'll get more detailed information.
@ploum Basically these two links allow you to get an overview of the case:
http://blog.ptsecurity.com/2017/04/intel-me-way-of-static-analysis.html
https://schd.ws/hosted_files/osseu17/84/Replace%20UEFI%20with%20Linux.pdf
@ploum And I forgot the link -_-'
https://www.networkworld.com/article/3236064/servers/minix-the-most-popular-os-in-the-world-thanks-to-intel.amp.html