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You state that you have only 2 physical serial port which you detect to ttyS1 and ttyS2. ttyS3 and ttyS4 don't exist; they are exposed, but you have to ignore them. This is simply the way the driver works; it probes what may be a serial port and expose it to you, but you have to verify it is a real serial port because the driver can't be 100% sure. This ...


You might want to take a look at http://serialconsole.sourceforge.net Pro: doesn't have obvious security problems like minicom or picocom (if you don't have a problem giving the users shell access, no problem, but you most likely do have one if you want to set up a terminal server...)

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