How to power up cores 2 and 3 on XU7

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In Vitis 2022.2, when creating multiple applications to run on the 4 Cortex A53 cores of the Xilinx XU7 MPSoC, I get the message "cannot reset Cortex-A53 #2. Core is powered down" when starting a debug session. This is also the case for core #3. I could not figure out where to enable or power up the additional cores. Also, for the RPU core #1, I get this message "Processor in Lock Step Mode". What did I miss?

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