[julian_1]

Up until a few weeks ago, people speculated the firmware blobs included a small amount of low-level bootstrap code used to configure IO and to switch from 16 bit to other modes etc.

Nobody suggested there was a parallel multi-process operating system running, with full bus arbitration, and mmio capability.

Edit. Not sure why I am being downvoted reddit style. Every-time these threads come up - it's necessary to trot out an explanation of the basic differences between ARC core, psp, arm cortex and trustzone etc, and who uses what technology, what is known about the software/OSes that are running - jvm versus minix-os, amt versus ME etc, what is new knowledge, what is official, and what has been uncovered from private research. I base my statements about lack of general awareness on these topics from actually following HN submissions.

Just a few days ago, someone in a thread was speculating on using low-level op-codes in bootstrap code to subvert the BIOS, apparently in complete ignorance of the depth of the embedded stack.

[sounds]

Information about the previous CPU architecture on the Intel ME has been widely available for years. It was an ArcCompact CPU running ThreadX:

https://www.slideshare.net/codeblue_jp/igor-skochinsky-enpub

[julian_1]

Where is Minix OS mentioned? How many preemptive processes are running? Which orgs - internal or external to Intel have review-power or signoff on the code running ?