Comment # 27 on bug 1193596 from Ang

This seems to match up with what I was finding when I first noticed this
problem. It makes it quite difficult to troubleshoot this machine if it is not
booting unless you have some sort of terminal connection.

The Raspberry Pi 4 platform requires at least two pieces of hardware to be
initialized on boot. One of these is the USB chip, and the other is the FB
device. If the USB is not initialized, it will not be able to take any keyboard
input from connected USB devices. This gets in the way of installing OpenSUSE
on it the regular way using an ISO. It also gets in the way of interacting with
the bootloader as the system is booting. It has to be ensured that these two
drivers are loaded early in the boot process.