Hello @lugl and welcome to the ST community,
First, in next time please post your question in English. Please review How to write your question to maximize your chances to find a solution
Second, you would refer to the AN5617 "STM32H745/755 and STM32H747/757 lines inter-processor communications"
+ There are few methods using the data over a shared RAM and perform these operations by using HW semaphore to do these exchanges or use middlewares like OpenAMP. You can refer to the following examples for OpenAMP: https://github.com/STMicroelectronics/STM32CubeH7/tree/master/Projects/STM32H747I-EVAL/Applications/OpenAMP
Hope that helps.
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