I tried version 5.4(.20) - Ubuntu/Bionic (downloaded from https://www.armbian.com/nanopi-duo-2/ )
Since this topic is about creating 5.4 version for a processor series that I use, I think my posting here is correct.
I have the Allwinner H3 (SUN8I 1680) processor on a NanoPi Duo2 board.
The startup of Bionic hangs at a certain point, always the same point. Here the complete log (in a spoiler block so not everyone has to see this/scroll over it)
I tried reflashing a couple of times to the SD card.
I tried a different image flasher tool (tried win32diskimager and etcher)
I tried 2 SD cards, both with same result.
Now the interesting bit: the Buster (Debian) variant of 5.4.20 DOES work corrrectly and boots up perfectly.
Is this interesting feedback for you?
Is there a solution for my Bionic/Ubuntu version?
Can I give you more information you possibly need?