Using STM32U5 with 1st and 2nd stage bootloader

[Nano-HK]

Hi,

we are using b_u585i_iot02a board and try to build 1st and 2nd stage bootloader to achieve secure boot and upgradeable bootloader. We are using Zephyr project with TF-M and looking into how this can work. How does it work when using TF-M, is this built per default or are there requiremetns needed?

Regards,
Nano