Hi,

We are working on CMSIS-Zone Utility [1] which is a GUI tool for configuring a complex system. This includes also TrustZone setup (SAU) and device specific MPC and PPC.

This tool can be also used to configure SAU, MPC and PPC in TF-M.

However TF-M currently requires that a specific region number is used for NS_REGION_CODE (0), NS_REGION_DATA (1), ...

Those region numbers are used when SAU is configured in function sau_and_idau_cfg and the code in function tfm_core_memory_permission_check_handler depends on it.

Is it really necessary that a specific region number is being used and why?

I have received indication that this in not really needed and that the code should be redesigned. This would enable the use of CMSIS-Zone to configure TF-M out of the box.

Thanks, Robert

[1] https://github.com/ARM-software/CMSIS-Zone

IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.