serial console output

[Tedman Eng]

Pick one as your primary.  

Bootloader and kernel and messages can echo to both consoles, but init
scripts will only echo to one console (your primary console).  The order of
the "console=" in the kernel line in grub.conf determines which is the
primary.

You can have multiple "console=", ie "console=ttyS0,9600n8
console=ttyS1,9600n8 console=tty0", but only the primary display will show
init script output.

See:
http://www.tldp.org/HOWTO/Remote-Serial-Console-HOWTO/bugs-monitor.html




-----Original Message-----
From: Derek Yeung [mailto:dky at utcc.utoronto.ca]
Sent: Monday, July 11, 2005 9:57 AM
To: Keegan, Gordon
Cc: kickstart-list at redhat.com
Subject: RE: serial console output




I've discovered if we remove the

   terminal --timeout=2 console serial

line in grub.conf, all *grub* messages will go to both ttyS0 and tty0.

But still don't have ideas for how to get the messages after the
"Welcome to RedHat Linux..." line to show up.



/dky

On Mon, 11 Jul 2005, Keegan, Gordon wrote:

> I've had the same issue under Lilo as well as grub and haven't found a
> solution for either one.  Theoretically, specifying tty0 and ttyS0
> should setup both devices to receive console output, but it doesn't seem
> to work that way.  Here's hoping that someone else has had better luck.
>
> Gordon Keegan
>
>
> -----Original Message-----
> From: Derek Yeung [mailto:dky at utcc.utoronto.ca]
> Sent: Thursday, July 07, 2005 3:15 PM
> To: kickstart-list at redhat.com
> Subject: serial console output
>
>
>
> Hi!
>
> Does anyone know how I can have all the messages during boot time, after
>
> the
>   "Welcome to RedHat Linux ..."
>
>    line output to *both* the monitor and ttyS0?  Right now, with the
> grub.conf changes below, seem to restrict the output of messages after
> the
> welcome line to either the monitor or ttyS0 ...  I'd like the output to
> go
> to both places.
>
>
> I've made the changes in grub.conf, specifically:
>
>
> -- /etc/grub.conf --
> #boot=/dev/sda
> default=3
> timeout=10
> serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
> terminal --timeout=2 console serial
> #splashimage=(hd0,0)/grub/splash.xpm.gz
> title Red Hat Enterprise Linux AS (2.4.21-32.0.1.ELsmp)
>         root (hd0,0)
>         kernel /vmlinuz-2.4.21-32.0.1.ELsmp ro root=/dev/vg00/root
> console=tty0 console=ttyS0,9600n8
>
> -------------------
>
> I recall there was another line, somewhere in /etc/sysconfig that i
> needed
> to change?
>
> Suggestions?
>
>
> Very much appreciated,
> /dky
>
>
>

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