https://wiki.raptorcs.com/wiki/Blackbird#External_Links
https://www.raptorcs.com/content/BK1MB1/intro.html

if the mainboard is located in a physically secure environment (e.g., a secure computing room or locked desktop case), you can be assured that only your pre-approved and pre-audited firmware, kernel, and user space components are executing on a Blackbird™ system.