Hi @omac777 thanks for looking! Yes I ran into the hextdump0815 project, I didn’t try it yet tho, it does look quite good.
Just regarding the uEnt.txt, I was sort of going for minimal extra settings to get it working, eg most of those settings are now not needed with latest firmware. As for extlinux.conf, I’ve left that out by design as it’s generated by u-boot-update just like how update-grub works, which is a bit cleaner.