[Buildroot] syslog output to serial console

[Arnout Vandecappelle <arnout@mind.be>]

On 21/08/13 22:22, Bryce Schober wrote:
> I realize that this is a bit off-topic...
>
> I've configured my target for boot-loader & linux boot serial console
> output, but now I'd really like to redirect the rest of what gets into
> syslog to the serial console as well. Is there a way to do that with
> busybox syslog?
>
> The primary use-case here is for seeing the output results / errors from
> my set of /etc/init.d scripts, so if it's not feasible to get this
> re-direction up and running early in the boot process, it wouldn't be
> worth it.

  Actually, the output of init scripts should already go to the console. 
When the kernel mounts the rootfs and calls init, it sends its stdout and 
stderr to /dev/console. If your rootfs is an initramfs, however, the 
kernel doesn't automount the devtmpfs so /dev/console doesn't exist when 
/init is executed. We solve this with the script in fs/cpio/init. If this 
is the problem, you'll see that the kernel reports something like "Unable 
to find initial console".

  The only thing captured by syslog are the messages going to /dev/log, 
which are sent out by some daemons. If you want this output to go to 
/dev/console as well, you can add something like

::respawn:/usr/bin/tail -50 -F /var/log/messages

to /etc/inittab.


  Regards,
  Arnout

>
> Thanks for any advice or pointers you can offer...
> <><  <><  <><
> Bryce Schober
>
>
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-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
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