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Is it possible to set a memory region from non-secure to secure at runtime?

Ed Player

This question was raised in the 'How to implement a secure IoT system on ARMv8-M' webinar, view all the questions in the round up blog post. 

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    Yes, it is possible for secure code to do this by reprogramming the SAU. It's also possible to reconfigure a region to from secure to non-secure, provided that the IDAU doesn't already mark that region as secure.

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    Yes, it is possible for secure code to do this by reprogramming the SAU. It's also possible to reconfigure a region to from secure to non-secure, provided that the IDAU doesn't already mark that region as secure.

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