I pushed an unclean set of images to the webserver by mistake where Kodi is built against python 3.8 but the OS has python 3.9 so Kodi fails to start. Those images have now been replaced with some corrected ones. The Python 3.9 change is fresh so I won't guarantee all add-ons have been published to the LE repo yet (the bump was in the last 24h). I have no interest in maintaining Matrix images as I have limited time for testing and Nexus better supports the Amlogic codebase.
I've test installed on a C2 and Ethernet works fine for me, see http://ix.io/3PBJ. The u-boot patch you found is still being included pstream, see https://github.com/chewitt/u-boot…ot.dtsi#L32-L36 - and the unknown boot command line is harmless, I'm not aware of any hardware issues with C2 other than the USB ports needing a hack to prevent the driver from autosuspending (which is in my kernel image).