None of these have good support for serial port only devices. Fedora and Ubuntu take some tweaking to get them to pass real text to serial. Debian would probabl

None of these have good support for serial port only devices. Fedora and Ubuntu take some tweaking to get them to pass real text to serial. Debian would probably work ok. The biggest issue is they aren't designed for read-only partitions which is necessary for certain types of flash memory.