I recently noticed Hardened Linux, because they were calling CHIPSEC. I just noticed they have some informational pages with info on Intel ME/AMT/UEFI and other technologies:
https://github.com/hardenedlinux/firmware-anatomy
https://github.com/hardenedlinux/firmware-anatomy/blob/master/hack_ME/firmware_security.md
https://github.com/hardenedlinux/firmware-anatomy/tree/master/hack_ME
https://github.com/hardenedlinux/firmware-anatomy/blob/master/hack_ME/me_info.md
https://hardenedlinux.github.io/about3/
https://hardenedlinux.github.io/system-security/2017/07/31/firmware_chipsec.html