With the integration of the IAR toolchain support in TF-M it has become important to use the REGION_DECLARE/REGION_NAME macros in platform/region.h instead of using symbols like "Image$$ARM_LIB_STACK_MSP$$ZI$$Base".

The IAR linker can not use these symbols and the macros in combination with the IAR specific cmake rules creates appropriate symbols for all the supported toolchains.

Example diff: ---      /* Set Main Stack Pointer limit */ -    extern uint32_t Image$$ARM_LIB_STACK_MSP$$ZI$$Base; - __set_MSPLIM((uint32_t)&Image$$ARM_LIB_STACK_MSP$$ZI$$Base); +    REGION_DECLARE(Image$$, ARM_LIB_STACK_MSP,  $$ZI$$Base); +    __set_MSPLIM((uint32_t)&REGION_NAME(Image$$, ARM_LIB_STACK_MSP, +                                        $$ZI$$Base)); ---

Thomas