Reg. Serial and Virtual consoles

Reg. Serial and Virtual consoles

[Selvamuthukumar V]

Hello,
I'm  working on a MPC8360 board. I've connected a VGA card in a PCI slot.
I modified the kernel commandline console parameters, and now I'm getting
all the kernel messages in both serial port and VGA. I modified the
/etc/inittab file and getting login prompt in VGA(virtual terminal). Is
keyboard is necessary to login via virtual terminal? Is there anyway to
select serial port as the input to the virtual terminal? I want to login
to the virtual terminal and want a shell in VGA. Please guide me in this
regard.

     -Selva

Re: Reg. Serial and Virtual consoles

[Milton Miller]

It sounds to me that you want all input and output on the serial line to be echoed to  the vga screen both user and kernel.  Do you also require keyboard input?

While others have described how to get the kernel messages displayed on both the screen and the serial port, they were missing the userspace requirement.

You will either need to write your own multiplexer program in user space and do the mirroring there, or use something like the screen program.  Either way the program will be running on a pty and some agent will be mirroring the text.  If you only require serial input it could be as simple as opening tty1, ttyS0, and the pty master and forking tee and cat to handle the master, your getty would run on the slave.

milton

Re: Reg. Serial and Virtual consoles

[Linas Vepstas]

On Thu, Aug 10, 2006 at 11:51:46AM -0500, Milton Miller wrote:
> It sounds to me that you want all input and output on the serial line to be echoed to  the vga screen both user and kernel.  Do you also require keyboard input?

I missed the start of the conversation, so the following suggestion may
be irrelevent. However, if the goal is to get kernel messages displayed
in lots of different places, this is easily done by running syslogd, and
adding the following to /etc/syslog.conf:

kern.*;*.err      *

If you don' want them slatered everywhere, but only on 
the console, then:

kern.*;*.err      |/dev/console

--linas