I've used the MineOS software to run minecraft servers for my kids at home. I've always used old x86 hardware to run it...but they are not too power efficient.
A while ago I decided to try running it on SBCs and it was just too slow or did not work well (poorly performing arm Java, slow cpus)
This weekend I spent some time trying to get it work on my Khadas+. It took some time to get it to work. I followed these instructions:
The main problem I had was with installing nodejs and npm. I can't remember all the steps I used to get it to work, I think I ended up using nodejs legacy.
Eventually I got it to install...and it works! So far I've tested it with 1 minecraft server running and one player logged into the world. I want to test it with more players.
If anyone is interested in knowing how it works with multiple players / servers running at the same time, please let me know!