H6 TV Box LAN network question

I have a generic TV Box which has a Allwinner H6 chip and 2G RAM/ 16G ROM. I have managed successfully to boot all Libreelec H6 images from SD card, except the Tanix TX6 image. But unfortunately, none of the images allow me to connect to the network via the inbuilt ethernet port. I can connect a USB / Ethernet adapter to the USB2 port and this will allow me a wired network. I have also tried some versions of the nighty but still no inbuilt ethernet. I have opened up the box and note that there seem to be no standalone ethernet chip. Do I have to do anything to enable the inbuilt ethernet?

The inbuilt ethernet works perfectly when I boot into Android 7, which is the last upgrade for this box

Pictures of front and back PCB. On the front board, the silver chip, top right, is AP6255a, which is the wireless chip. I don't care whether the wireless works. The black square chip below the wireless chip is AXP805, which seems to be voltage regulator

H6 - linux-sunxi.org

On the right under network connectivity, it says "GBit MAC, integrated 10/100M PHY", which seems to imply that there is an option to use the internal PHY, although some boxes have external to include 1000M, I guess