I just came here via web search. I'm not using armbian but openSUSE. Like others here, I found that u-boot 2020-10 and later (tried up to 2021-04) do not detect my ethernet hardware (more precisely, the PHY). u-boot 2020-01 and 2020-04 work for me (like 2020-01). I'm using a 5.3 kernel. So far I suspect commit dd5f2351. Has anyone tried to revert this yet?