Re: PROBLEM: 2.2.5 unstable on Dell PC, 2.0.36 is stable

Richard Black (rjb@dcs.gla.ac.uk)
Wed, 28 Jul 99 11:21:45 +0100

> > Does serial console require lots of magic config options?
>
> Not at all. It's a standard compile option, and once it's enabled the
> kernel will let you redirect console to a serial port by using a boot
> option such as "console=ttyS0,9600". That takes care of the kernel
> console output, but you can also make init send all of the user console
> stuff (the boot logs) to the serial port by making /dev/console point to
> the appropriate serial device. Even singleuser login will then go to
> serial. Options also exist on LILO for serial console.
>
> --Stephen

>From Documentation/serial-console.txt

> You can specify multiple console= options on the kernel command line.
> Output will appear on all of them. The last device will be used when
> you open /dev/console. So, for example:
>
> console=ttyS1,9600 console=tty0
>
> defines that opening /dev/console will get you the current foreground
> virtual console, and kernel messages will appear on both the VGA
> console and the 2nd serial port (ttyS1 or COM2) at 9600 baud.

easter:~> cat /proc/cmdline
auto BOOT_IMAGE=linux-2.2.10 ro root=801 console=tty0 console=ttyS0,9600n8
easter:~> really "echo foo > /dev/ttyS0"
easter:~> really "echo bar > /dev/console"

The string foo appears on the other logging machine, but not bar and
none of the kernel messages appear.

Richard.

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