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There is no reason other than "historical reasons" for the cap. A patch to add additional speeds would be welcome. (It's a shame the relevant ioctls don't permit easy mapping from a number to an ioctl constant, otherwise we could accept arbitrary speeds...)
Thanks for the pointer! I've found the same hardcoded constants in termios manpage so that's where the limitation seems to come from. I'll see if I find a way to set arbitrary speeds on modern systems.
Looking at https://github.com/tonyg/erlang-serial/blob/master/c_src/serial.c#L88 maximum speed is hard-coded as 230400 baud, but there's no explanation given for said cap.
We might need speeds up to 460800 baud in the current project, so I wonder if there is a reason for the current speed limit?
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