How can the ARM Cortex-A35 communicate with the ARM Cortex-M33 in order to make a "Hello World" and be able to use it for more applications?

[PabloAperribay]

Based on the steps of the ST wiki on the stm32mp257f-dk through a VirtualBox to be able to use Linux and configure the A35, we realized that when performing the last steps of the wiki on the M33 we get connection errors with the board. That is why we have not been able to use the M33 independently. Because of this, we want to know how to make the connection between both microprocessors and thus have the possibility of configuring the M33 and being able to give it more uses.