BPI-W2- Uart 2 not working

Hi, I have been tring to USe the uart (UR2) on the 40 pins GPIO connector. I am using the ubuntu mate distribution: Linux bpi-iot-ros-ai 4.9.119-BPI-W2-Kernel #4 SMP PREEMPT Thu Dec 27 19:07:12 CST 2018 aarch64 aarch64 aarch64 GNU/Linux

I am able to use to ttyS0 output but ttyS1 and ttyS2 doesnt seem to work as I would have expected. I tested the communication with a oscilloscope at the following pin on the 40 pin connector(8-10).

Does anyone was able to use those pin in uart mode ?

Regard JA