In the process, did you face any issue with the clock config?
Someone has started a port of the Portenta H7 for the Zephyr RTOS and he cannot get the clock running at more than 100 MHz on the M7.
I have tried myself and even with specifying other prescalers values, the system is still running at 100 MHz while the system thinks it is running at 480 MHz (UART corrupted and blink sketch 4,8 times too slow).
I know that the Zephyr code is very different but just in case we have missed something at the init step.
