If you have a modern Intel CPU (released in the last few years) with Intel’s Management Engine built in, you’ve got another complete operating system running that you might not have had any clue was in there: MINIX.
https://www.networkworld.com/article/3236064/servers/minix-the-most-popular-os-in-the-world-thanks-to-intel.html
https://www.eff.org/deeplinks/2017/05/intels-management-engine-security-hazard-and-users-need-way-disable-it
https://wiki.gentoo.org/wiki/Sakaki%27s_EFI_Install_Guide/Disabling_the_Intel_Management_Engine
Intel chipsets for some years have included a Management Engine [ME], a small microprocessor that runs independently of the main CPU and operating system
http://www.zdnet.com/article/minix-intels-hidden-in-chip-operating-system/
the author https://www.youtube.com/watch?v=86_BkFsb4eI
ref - https://www.pipiscrew.com/2017/11/bios-or-uefi-replacement/
origin - http://www.pipiscrew.com/?p=11034 minix-the-most-popular-os-in-the-world-thanks-to-intel