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Date:      Tue, 26 Mar 2002 17:05:48 -0800
From:      Aditya <aditya@mighty.grot.org>
To:        freebsd-hardware@freebsd.org
Subject:   serial console vs. serial terminal
Message-ID:  <20020327010548.GA78994@mighty.grot.org>

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This has me entirely confused so any hints are very appreciated.

I have 3 different types of motherboards running FreeBSD 4-STABLE all in
various states of cvsup but none older than 2 weeks ago. Using a null modem
cable from one of them I can connect to each of the serial ports and get a
login prompt as per what I have for ttyd0 in /etc/ttys:

  ttyd0   "/usr/libexec/getty std.9600"   dialup  on secure

however, if I connect to them from a Cyclades T2000 terminal server using a
cat5 patch cable and a RJ45-DB9F modular adapter I can't type anything in but
I do see output (ie. from syslog). The most bizzare thing is if I reboot with:

  set console=comconsole

in /boot/loader.rc it works fine with the Cyclades...that is, booting up, I
see:

  sio0: type 16550A, console

rather than:

  sio0: type 16550A

So what is it about explictly setting sio0 to be the console that changes the
serial line discipline? Connecting with a regular null modem cable seems to be
unaffected in either case.

Adi

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