Hello Geert I made a test with a pre-built image from banana-pi.org. This is Debian 8 "Jessie" with a very old kernel 3.4. I assume, the famous sunxi-kernel. Here, the Ethernet works. The complete log during booting is attached. Hopefully, it helps.
To your questions: > * Which power connector is used? ( barrel or microUSB ) Barrel > * What power supply is used? ( Volts, Amperes ) 5V / 2,5A > * Did tests happen with other cables? [y/n] No. > * Did tests happen with other power supplies? [y/n] No. If necessary, i can repeat the tests with my laboratory-power-supply. If i can do further tests, or if you need further informations: please let me know. Best regards Bernhard