[TriLUG] Re: console access through serial port?

lfwelty lfwelty at redback.com
Thu Apr 18 11:16:38 EDT 2002


lfwelty wrote:
> 
> Will this allow you to run headless?

Ummmmm, that's kind of a stupid question, of course it will allow
you to run headless.  I guess what I mean is, if it passes your vga
to the tty, will you be able to boot headless?  I don't suppose it
changes your bios... so not likely... :/

F.

> 
> Ben Boulanger wrote:
> >
> > On Thu, 18 Apr 2002, Rodent of Unusual Size wrote:
> > > 1. Is there any way to get access to the console through the
> > >    serial port?  I have another system that does this for VMS
> > >    and T64U systems (anyone remember VCS?), but it's unclear
> > >    to me whether Linux supports it -- and, if so, how I can
> > >    set it up.  I basically want to be able to give an irresistable
> > >    three finger salute through the serial port if need be, to
> > >    *force* a crash/reboot.
> >
> > To get kernel info output to the serial line (and lose it on the VGA
> > line), in lilo.conf add:
> > serial=0,38400n8
> >         image=blah
> >         append="console=ttyS0,38400"
> >
> > and to get a vty on your serial line, in inittab add something like:
> >         s0:12345:respawn:/sbin/mingetty ttyS0 DT38400 ansi
> >
> > Then connect up the proper cable (Null modem for computer to computer) and
> > run minicom or some other terminal program on it.
> >
> > > 2. Provided I can get in, is there any way I can *crash* the
> > >    system so I can take a look at a dump to figure out WIH was
> > >    going on to wedge it?
> >
> > There's a few different things you can do (gdb?) to crash a system, you
> > should be able to find that on google... but I wonder if that kernel
> > config option "SysRq key" would help you here.  Check the kernel stuff on
> > that one.
> >
> > Ben
> > --
> >
> > A gem cannot be polished without friction, nor a man perfected without
> > trials.
> >
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> 
> --
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