Re: Help with COM port based terminal access
Oh, ok. Now I'm with you. Sure, for this you don't want mgetty. Just use
the regular getty that's already on the system. Here's what you do.
First edit /etc/inittab to get init to run a getty on your chosen serial
port (I'll assume for purposes of exposition you want to use the first
serial port, /dev/ttyS0). I'll also assume you want to run the port at
38400bps. Add the following line to /etc/inittab:
T0:23:respawn:/sbin/getty -L ttyS0 38400 vt100
Now to get init running this do 'kill -HUP 1' (init is always the first
process in linux and so will always have the pid 1, the HUP signal tells
init to reread /etc/inittab and act accordingly for any changes). Now
the getty should be running.
On your laptop you'll want to install a terminal program. I prefer seyon
(which is an X app) or minicom (curses app). Hook up your null-modem (Rx
and Tx are swapped) serial cable, run your terminal program, set the bps
to 38400 and you should be in business. You should get a login prompt.
Dinesh Nadarajah wrote:
> Sorry for the earler blank message. What I am trying
> to do is very simple actually. I would like to hookup
> my laptop to the seriel port of the linux machine and
> use a program like hyperterminal on the laptop to
> access the linux machine on COM1 or COM2. How will I
> do that. mgetty seems like a modem based access
> program that looks for dial tone etc. There is no
> info. on how to setup mgetty for this. Have
> sucessfully done this?
>
> Thanks a lot in advance for the advice.
>
> Regards,
>
> -Dinesh
>
> --- "Jens B. Jorgensen"
> <jens.jorgensen@cmgisolutions.com> wrote:
> > This is easily done by running mgetty on the port.
> > Note that booting your computer
> > keyboard-less can be a problem. Many systems will
> > hang in the BIOS POST if they can't
> > sense the keyboard is present. On some systems this
> > can be turned off in the BIOS
> > setup. This has nothing to do with linux. I believe
> > you can buy little plugs which go
> > in the keyboard connector which will make the system
> > think there's a keyboard present.
> >
> > I also found that I had to modify the kernel source
> > to get linux to boot without a
> > keyboard but this was with a 2.0.X (where X == I
> > don't remember what) in order to get
> > it to work because there was some startup assembly
> > code which was making a call to
> > clear the keyboard buffer and it would cause the
> > system to hang (or crash, can't
> > remember which). Hopefully this is alleviated in
> > more recent kernels. Serial console
> > support should be set up in your kernel config
> > (you're going to need to compile your
> > own kernel) and lilo can be set up for serial
> > console support as well.
> >
> > Good luck,
> >
> > Dinesh Nadarajah wrote:
> >
> > > Hi:
> > >
> > > I am trying to setup several linux systems that I
> > > would like to administer over a network and/or via
> > the
> > > serial port. The serial port based admin. is
> > important
> > > in some cases when network is down etc. Is there
> > any
> > > way of running a Kermit like program to connect to
> > a
> > > linux box through COM ports and login to the
> > system.
> > > This feature (Monitor less, keyboard less, mouse
> > less)
> > > operation is available on IRIX, AIX and Solaris.
> > There
> > > there a similar service I can run in linux.
> > >
> > > Thanks in advance.
> > >
> > > -Dinesh
> >
> > --
> > Jens B. Jorgensen
> > jens.jorgensen@cmgisolutions.com
> >
> >
>
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--
Jens B. Jorgensen
jens.jorgensen@cmgisolutions.com
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