I'm quite familiar with Clever's work. I understand how it's put together at a pretty deep level - and it's still weird. It's not the slightest bit like anything else that is used as a general purpose computer in the layout of "how pieces talk to each other or how they interact with hardware." You can draw some parallels to the ARM Trusted Firmware interfaces if you squint hard enough, but it's still a really weird hardware layout for what it's commonly used for.