What Happens When a CPU Starts

• sbe

  2 11 1.2 C

  Self-Boot Engine

  

Something fun mentioned in a comment on that article, this the majority of this "pre-boot" code is actually FOSS in POWER9. There are a set of "auxiliary processors" called "PPE"s, among which there is one, the "SBE", or "self boot engine", which is a very small and simple PowerPC core that IPLs the big POWER9 cores [0]. These big processors with tons of cache and interconnects need a lot of help to get to executing PC 0x00.

I suspect that almost all the big "application processors" from Intel and AMD, and the exotic ARM/SPARC server chips, have equivalent embedded ICs to jump-start the "big cores".

[0] https://github.com/open-power/sbe/blob/master/src/sbefw/app/...

• ruletablerepository

  4 88 0.0 C++

  Previously at https://code.google.com/p/ruletablerepository

  

• WorkOS

  workos.com sponsored

  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

• MicroPython

  197 18,317 9.8 C

  MicroPython - a lean and efficient Python implementation for microcontrollers and constrained systems

  

Might want to look at MicroPython. The ports have various init functions for various chips /system. It might not be a full OS, but it is pretty low level code you can compare to various other systems.

https://github.com/micropython/micropython/tree/master/ports

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