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Keil Secure World Debugging on CM33

mcak

Hello, 

I am working on the NUCLEO-L552ZE board powered by Cortex M33 STM32L55 MCU. I am just trying to debug the Secure World using the Keil. When I start the debug mode, it seems the Secure mode is disabled by default, and the TZEN bit is zero. 
The debug view is like an Armv7-m MCUs, and I cannot see Partitioned Secure/Non-Secure Cortex Register Windows in the Keil Debug View. 

I saw an option called "Models Armv8-m Debugger" in the Debug List, when I debug using this option, I can see partitioned Secure/Non-Secure register windows, and I can see a label in the Keil Status bar like "CPU: Secure"; that is why I try to see. Just, this option did not work for me, anyone can succeed for this mode?

The board has an onboard ST-Link debugger which does not need an external programmer, so I selected ST-Link in the Keil Debug Window. 

I am wondering is it about the onboard STLink, it may have a limitation. 

If I create a project using STM32CubeIDE, it asks to enable TrustZone but I don't see this option for Keil. So, how Keil enables TrustZone?

Please feel free to guide on any option that allows debugging Secure World.

Thank you in advance.
Murat

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