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Re: Enabling Serial Port Console Login



No need to recompile the kernel. Your kernel should either have serial port support
compiled in or in a module. On your server try 'cat /dev/ttyS0' If you get an error:

cat: /dev/ttyS0: No such device

Then your kernel doens't have support. Otherwise it does. Now you just need to run a
getty on the port. This is the process that actually listens to the port for
connections and allows you to log in. init starts the getty processes. Add the
following line to /etc/inittab:

S0:23:respawn:/sbin/getty 38400 ttyS0

To get init to reread /etc/inittab and start up a getty just run 'kill -HUP 1' or
reboot. Now inittab will start a getty process on the port, setting it to 38400 baud.
Of course you can change the baud to match whatever you're coming in at from your
terminal server. You should now be table to log into your machine if it's got a
crossover cable hooked up to COM1 (yes, you definitely do need a crossover cable
unless it's a modem hooked up to COM1; computers and terminals are wired DTE on their
serial ports so this is necessary).

Peter Kim wrote:

> I need to be able to login to my Linux web server, via a communications
> server (Portmaster).  The communications server will be connected to web
> server with a serial cable.
>
> I've connected my PC to my web server's serial port (COM1) and (COM2)  with
> a cross cable and tried to login with Tera Term.  Tera Term cannot connect.
> Nothing shows on the terminal and anything I type does not appear on the
> screen.
>
> I have heard that I have to recompile the kernel with some options set to
> make COM1 AND COM2 come "alive".
>
> Questions:
> 0. Is it possible to have COM1, COM2, or BOTH come alive?
> 1. What options do I have to set when I compile my kernel?  I am running
> "make xconfig" and I can't seem to find any option that turns this feature
> "on" on the GUI.
>
> Help!
> :-)
>
> Thanks,
> Peter
>
> --
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--
Jens B. Jorgensen
jens.jorgensen@cmgisolutions.com




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