Hello, I'm curious to know how to add a secure boot feature on the STM32429I-EVAL1. I would like to allow the boot on a bootloader located in the flash memory, only if this one is known by the internal bootloader.

I'm trying to add a authentication mechanism with a symmetric key stored in the system memory but I'm not sure if it's the right way and i also don't know how to store this key in the system memory.

I read about SBSFU but not sure about it.

Kindly advise me on how could i do it please.

Thanks in advance.