Ubuntu 20.04 daily iso build works with 5.6.2 kernel (deb package) from https://kernel.ubuntu.com/
1.device tree from mainline doesn't work, currently using dts from 5.4 (5.5?)
2."modprobe.blacklist=fusb302" is needed if you use a PD power supply
3.USB2 in u-boot is not stable, USB3(type-c) in u-boot is not usable
4.directly booting the iso without modification is not possible since you need to provide it with a device tree
5.you won't get USB3 working if you take step 2
6.to get correct display using efi boot, append "video=efifb:off"