Worth pointing out OpenTitan (which I work on) here: www.opentitan.org, www.github.com/lowrisc/opentitan It's an open silicon root of trust. All the RTL (syste

Worth pointing out OpenTitan (which I work on) here: www.opentitan.org, www.github.com/lowrisc/opentitan It's an open silicon root of trust. All the RTL (systemverilog code that describes the hardware), DV (design verification, which is used to demonstrate the functional correctness of the design so you are confident in building a chip with it), documentation and software is open source and available on the repo linked above. Being able to trust your root of trust is obviously vital and current implementations are proprietary and heavy NDAs required to get any more detail. With OpenTitan you can go as deep as you want to understand what's actually going on.