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Excepted Practice for NS writes after setting M33 SAU.ALLNS

kappajacko

What’s the excepted programming sequence for setting the SAU.ALLNS to when you can start issuing NS transactions?

Assuming MY_BLOCK is Secure, this sequence actually writes the REGISTER:

SAU->CTRL = ALLNS_Mask;

MY_BLOCK_NS->REGISTER = 0xDEADBEEF; 

This sequence doesn’t write the secure peripheral MY_BLOCK as expected:

 SAU->CTRL = ALLNS_Mask;

__DMB();

MY_BLOCK_NS->REGISTER = 0xDEADBEEF;

 Is using the DMB instruction the excepted practice to ensure that the SAU CTRL ALLNS bit is set before moving onto the next instruction?

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