Raspberry Pi havin their own software as the second/third stage bootloader sure sure is kinda well documented and works kinda well. But oh god is it a faff to get to do something non standard. Just let me modify the u-boot environment and save it to disk/tftp 🥺

Also whoever thought that NFS rootfs should only work with proto=tcp, FUCK YOU for not documenting it! Wasted literally two day on this!