How does secure boot of STM32 work?

[SShoh.1]

Does it have hardware ROM for keys and certificates?

Can you bypass it by boot from USB?

What is the crypto hardware?

Is there a detailed block diagram?

[Jocelyn RICARD]

Hello @SShoh.1​ ,

STM32 MCU families have no secure boot implemented in ROM.

STM32 boots either on flash or on a internal bootloader that is used to flash the content of the firmware.

You have all details in reference manual of each STM32.

Best regards

Jocelyn