GPIO and Serial port on 40 pin header

Hi. I recently bought a AML-S905X-CC board to evaluate as a replacement for Raspberry Pi which I cannot buy. I have installed libre-computer-aml-s905x-cc-raspbian-stretch-headless-mali-armhf-4.19.55+-2019-06-24.img and it starts up fine.
Now I need to use the serial port on the 40 pi header pins 8 & 10.  But ls/dev/tty* does not show ttyACM0 like the Pi?  I tried ttyAML0 but this does not open for me. Reading online I see this is the debug port  on the 3 pin header.
So how do I use the serial port on the 40 pin header pins 8 & 10? referencing as a /dev/tty device

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