Follow-up Comment #27, patch #7559 (project avrdude):
I appreciate your desire to make this as portable as possible, but I don't
think we should worry about true RS232 connections for a few reasons:
First, we don't use RS232 for current Arduino boards. The old serial boards
that did use it don't have auto-reset.
Second, it's not clear how the auto-reset is supposed to be triggered for
RS232 boards. I'd argue that the behavior of existing Arduino boards (i.e
resetting on a high->low voltage transition of DTR) sets a software standard
(i.e. a 0 to 1 logical transition) for triggering the auto-reset. So if
someone does make an Arduino-like board with true RS232, they should base its
auto-reset circuitry on this defacto software reset standard - i.e. they
should make their board work with the current code.
Finally, the current code works and I've tested it on multiple operating
systems. Any changes will require retesting on a variety of configurations.
This doesn't seem worth it for hypothetical future boards whose behavior we
don't know (and therefore can't test).
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