I've been looking at modifying avrdude.conf to add support for ATmega328PB. In
doing so, I noticed the option `ocdrev` that is set to 0~4 on various chips. I
haven't found any primary documentation that directly describes this option.
I've seen references to OCD on AVR datasheets which I'm pretty sure refer to
On-Chip Debugger but I haven't found an obvious version number there, which is
what I'm guessing `ocdrev` controls. It would be nice if this could be