Resolved! For STM32G4xx, please clarify role of BFB2 in option bytes
If BLB2=1, hardware maps the System memory to address 0. The bootloader might've remapped it when it detects "valid code" in either bank, but it apparently does not do it, as witnessed by footnote to SYSCFG_MEMRMP.MEM_MODE description:1.When BFB2 bit...