🚀 go-pugleaf

Matt Hyne <mhyne@rp.csiro.au> wrote:

: Here is one that someone may be able to answer ... or tell me it can't be
: done.

: I have a Linux box without a monitor or keyboard.  I would like all the
: console boot messages to be piped to a terminal plugged into a serial
: port.

: Ie all the boot messages would appear on the tty, instead/as well as the
: console

Hi,

Here might be a solution for you, I was just looking
through the kernel code and noticed something that may help you. Somewhere
in the code there is a place to define CONFIG_SERIAL_ECHO. I didn't know
this existed until about 2 minutes ago when i was searching through the
drivers/char/console.c file looking for an easy way to change it over to
serial output instead of screen output. I have not tested this personally,
so i can not comment on how well it will work.

Here's an excerpt from the Documentation/Configure.help file :- 

Echo console messages on /dev/ttyS1
CONFIG_SERIAL_ECHO
  If you enable this option, all kernel messages that would usually go
  to the console will also be sent to the device /dev/ttyS1 which
  corresponds to a serial port; this could be useful if you attached
  a terminal or printer to that port.

I couldn't find it in any of the "make config" scripts, so you will have to
add it by hand. I have never really had to do this before, but, I think this
may work :-

Add the following line to /usr/src/linux/drivers/char/Config.in

bool 'Echo Boot log to serial port on ttyS1' CONFIG_SERIAL_ECHO

just after the "comment 'Character devices'" line.

Hope this is of some help, and I would be interested to hear if it works
too. :) 

Kind Regards,
Mark Assad.