How to enable the uart

Banana Pi SBCs design BPI-M2 Ultra / BPI-M2 Berry(A40i)
1

Hi, I’m running my BPI M2 Berry with Raspian OS. How can I do to enable the UART2, UART7, UART5 and UART4 ? I tried to modify boot/config.txt (like on Raspberry) but it doesn’t work.

thanks for your help DGC