This setup is performed in a secure CMSIS SystemInit() function called at startup before entering the secure

application main() function (refer to Arm® TrustZone®-M documentation of software guidelines).

Figure 6. Secure and nonsecure multiprojects structure

Non-secure project configuration

Non-secure project linker file

Non-secure project application include

and source files

Secure project configuration

Secure project linker file

Secure project application include and

source files

CMSIS device partition file for IDAU/

SAU, FPU, core and secure/non-

secure interrupts configuration

Non-secure callable services

Non-secure callable header file

(shared by secure project to non-

secure project)

Non-secure project components

Secure project components

UM2883

STM32CubeU5 MCU package overview

UM2883 - Rev 4

page 13/30