Hi @Sineos,
Thank you for pointing me in the right direction, I missed on the using the board as a second MCU bit.
I have deployed the klipper_mcu service however it does create a PID file but exits straight away hence why I do not have a /tmp/klipper_host_mcu
I looked up the pid in the PID file and it is not in my process list.
running /usr/local/bin/klipper_mcu --background --pidfile /var/run/klipper_mcu.pid -r
manually I get an ‘illegal instruction’ with exit 132 and same running the binary without arguments.
So it seem after all that klipper_mcu has instructions that are not supported by my platform Allwinner H6 even if it has been compiled locally.
I will switch to an RPI for now to validate my sensor setup works there and probably back to my orange pi to raise a bug in Klipper.
Many thanks,
Rafik