Boot

The kernel owns the reset vector. Reset_Handler() sets the stack limit registers on cores that have them and enters kernel_prep_c(), which copies .data (and .ramfunc with CONFIG_RAMFUNC), zeroes .bss, calls the SoC’s pbl_soc_early_init() (pbl/kernel/init.h) for vendor system init, clocks and caches, and then calls main().

        flowchart LR
  reset["Reset_Handler()"]
  prep["kernel_prep_c()<br/>.data, .ramfunc, .bss"]
  soc["pbl_soc_early_init()<br/>system, clocks, caches"]
  main["main()<br/>fw/main.c"]
  reset --> prep --> soc --> main

  classDef app fill:#fa4a36,stroke:#fa4a36,color:#ffffff
  classDef system fill:#fd8a7c,stroke:#fd8a7c,color:#171717
  classDef base fill:#525252,stroke:#525252,color:#ffffff
  class reset,prep base
  class soc system
  class main app