Re: serial port usage

On 9/13/07, Nick Holland <[email protected]> wrote:
> Darren Spruell wrote:
> ...
> > If cua00 is the right device to use when connecting out, why the
> > missing phone number error?
>
> That means your /etc/remote file is still at its defaults (which
> perhaps should change):
>
> tty00|For hp300,i386,mac68k,macppc,mvmeppc,vax:\
>         :dv=/dev/tty00:tc=direct:tc=unixhost:
>
> cua00|For hp300,i386,mac68k,macppc,mvmeppc,vax:\
>         :dv=/dev/cua00:tc=dialup:tc=unixhost:
>
> See, when you do "tip tty00", you aren't actually saying, "use port
> tty00", you are saying, "use /etc/remote entry tty00", which just
> so happens to point to port tty00.  It doesn't need to.  You could
> really mess with someone. :)
>
> Try doing this:
>
>   # tip tty01
>   tip: unknown host tty01
>
> unknown HOST, not unknown port (this machine has a second com port).
>
> The "tc=dialup" is what is hurting you.  Just change it to "direct".

I don't know why that didn't make sense when I looked at it at first,
but that did the trick of course. Is the following patch sensible?

Index: faq/faq8.html
===================================================================
RCS file: /cvs/www/faq/faq8.html,v
retrieving revision 1.196
diff -u -p -r1.196 faq8.html
--- faq/faq8.html       7 Aug 2007 00:17:50 -0000       1.196
+++ faq/faq8.html       14 Sep 2007 18:05:40 -0000
@@ -989,7 +989,7 @@ SPARC64 systems run as long as the base
 <h2>8.13 - I get Input/output error when trying to use my tty devices</h2>
 <p>
 You need to use /dev/cuaXX for connections initiated from the OpenBSD
-system, the /dev/ttyXX devices are intended only for terminal or dial-in
+system, since the /dev/ttyXX devices are intended only for terminal or dial-in
 usage.  While it was possible to use the tty devices in the past, the
 OpenBSD kernel is no longer compatible with this usage.

@@ -1017,6 +1017,14 @@ has finished, the
 <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=getty&amp;sektion=8">getty(8)</a>
 process will deal with it properly, without having noticed the
 intervening dial-out action.
+
+<p>
+Note that by default the cua devices present in <tt>/etc/remote</tt>
+are configured as dialout ports, which will not work for a directly
+connected serial console. Changing the <i>tc=</i> specification in the
+device entry from <tt>dialout</tt> to <tt>direct</tt> will allow the
+cua device to be used for connecting to a directly attached serial
+console on that port.

 <a name="Browsers"></a>
 <h2>8.14 - What web browsers are available for OpenBSD? </h2>

DS