Can U-Boot log its output to file? I'm a digital nomad operating a RPi 4B headless. I have 2 boot USB keys: one "known-good", and one for experimentation. Plugging into a monitor (which I don't have in my backpack) isn't trivial. Is there a way to have U-Boot write all output to a file on the ESP so I can read it from there rather than from a monitor? Thanks, Tom