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How to Change the Non Secure VTOR (Cortex-M33)

Hi,

I'm using the Cortex-M33 and I would like to know if it's possible to change the Non Secure Vector table offset address (VTOR) while maintaining the Secure VTOR pointing to a different address.

The VTOR_S is located at 0xE000ED08 and the VTOR_NS at 0xE002ED08.

If I change the address of the VTOR_S, the address of VTOR_NS also changes to the same as the secure. On the other hand, if I change the VTOR_NS (located at 0xE002ED08) nothing happens, not even the VTOR_NS itself...is there any protection bit that it's missing to me?

Thanks.

Top replies

Joseph Yiu over 6 years ago in reply to Afonso Santos +2 verified

You're welcome. Instead of using memory window to modify VTOR_S/VTOR_NS, debug tool should have some separate core peripheral access windows that allow you to control these registers. In case you want...
42Bastian Schick over 6 years ago +1

According the manual, VTOR is banked. So in secure mode you read/write VTOR_S and in normal mode VTOR_NS. But real world might differ from theory (I have no M33 yet on desk).
Joseph Yiu over 6 years ago in reply to 42Bastian Schick +1

That's correct. In addition, Secure software can change VTOR_NS using Non-secure alias address 0xE002ED08 as the original poster mentioned. The question for Afonso - are you talking about changing the...