I work on some fancy stuff that the engineers forgot to put serial ports on so I can look at basic processes.
Oh, there are workarounds but wouldn’t it be nice to be able to monitor the boot process on all the processors without the overall OS coming up?
If I'm bare metal on a system, I want that, and the ability to read and change the monitor program from the monitor program.
I've ported some stuff to the bitty little SBCs, and having an "Oh my!" port to examine memory can be a lifesaver.
Cooks can do that kind of stuff. ;)
/johnny