I don't understand. You say:

Under linux I found that I could connect with upgclient and with minicom with no problems.

What was it that wasn't working? emptool, maybe?

Also, the stty options are well documented in the stty man page, but they don't look quite like what you'd expect to see in a terminal application like minicom. Specifically, you'd want something like ``stty -parenb -cstopb cs8 -crtscts -ixon -ixoff 115200 < /dev/ttyS0'', IIRC. (I prefer to redirect stdin rather than use the `-F' option since it varies amongst different OSes, when it exists at all.)