Hi @JorgenFloy420, I rebased my changes, built a new image and etched it on a USB drive. It does start, but only from one of the USB ports - I haven't yet debugged why it does not start on the other one.
Anyway, at least now I confirmed, that both USB and SD card boot is possible.
XFCE is running and usable using keyboard+mouse combo on the other USB port and a monitor on HDMI.
here's your image: https://mega.nz/file/mdsHxDIR#vaEP7k-clLMe18MU4tkpznuKXFwJxnxoKeC_voZZuIk
Let me know, if you have any success with this one.
after some research i have (finally) found the original archives form balbes. they can also been burn to the internal eemc. with some work you can run bookworm with kernel 3.10.99 (dont ask why) from the internal storage...
https://archive.org/details/amlogic-s805-linux
tks for 0jw4tts witch uploaded those files to archive.og !!!