This is possible @Jorn
And the link you posted is valuable.
I’ve just found this topic Verdin-imx8mm - Torizon - Accessing UART on Cortex-M4 (UART2) on Verdin Developentboard V1.1->(RS485 UART_1) causes Hard Fault and it seems that a U-Boot rebuild is necessary.
But if an U-Boot rebuild is necessary in every case the list of peripherals assigned to Cortex-M is not those included in the default, the TorizonCore philosophy (stay focus on the application, and not on the OS) is a little bit decreased.
If this task could be handled by ApolloX + TCB, this would be great!
I’ve already written this somewhere here, but I cannot find the post anymore.
But the most important thing is finding a reliable way to reserve peripherals to Cortex-M (even if a little bit annoying or time-consuming)