[parisc-linux] Bug in kernel: console support STI/serial

[parisc-linux] Bug in kernel: console support STI/serial

[Christoph Plattner]

Hello PA-RISCers !

I tried the STI console for the first time on a 712/60
workstation but found a problem in handling console
devices.

I compiled the kernel with SUPPORT for both consoles,
the serial and the STI.

Per definition:
---------------
If no `console=xxx' the default is `tty0', and the
"current" virtual console is used.

The user can also select the console via command line
parameter for kernel: `console=ttyS0' for example for
the serial console.

Problem:
--------
On the current kernel, if I do not use the `console='
parameter, the kernel does following:

Boot,...
Output:
  Switching from PDC console ...

And now on the serial line !!!!! the output:
  Switching to STI console ....

Here is the error: Linux know's, it must use the STI
but uses the serial console.

I have not analysed the code fully, yet. Dependent on
my spare time, I can deliver a bug fix or point out the 
position of the wrong code.

------

By the way: How can I set the 712/60 to use serial
PCD console (command `path' does not work for console !)

Cheers
	Christoph P.

------------------------------------------------------------
private:  christoph.plattner@gmx.at
company:  christoph.plattner@alcatel.at

Re: [parisc-linux] Bug in kernel: console support STI/serial

[Christoph Plattner]

Hello,
	thanks for the prompt answer.

First of all Linux supports more than one console,
(defined with commans behind `console='), but this
is not the toppic here.

In a normal (iX86) linux kernel many console supports
can be activated (per config), but only one (!) of these
consoles are used !

So I compiled in support for serial and support for
STI, but I only use STI (default, no `console=' 
parameter used).

The output shows the usage of STI, too. So Linux decide
to use STI, but the output (and input) is done on the
serial console driver. This is really a bug.

The HELP button in for serial console support definitly
"says", that this only activates the support, but the 
serial console is only used, if `console=ttyS0' is
specified.

-----

BTW: Is there anyone who knows how to activate 
serial console on the 712/60 in the PDC console.
Normally "path console" or "path keyboard" can be
used. But not on 712/60 !!

-------

With friendly regards
	Christph Plattner


Thomas Marteau wrote:
> 
> Hi Christoph
> 
>         As far as I know, the kernel is not capable to manage two consoles. But, if you
> want to specify one precisely, you can try to give a console parameter to the
> kernel with "console=tty"
> > By the way: How can I set the 712/60 to use serial
> > PCD console (command `path' does not work for console !)
> >
> > Cheers
> >         Christoph P.
> >
> Good Luck, Thomas
> ESIEE Team

-- 
  +--------V--------+	Christoph.Plattner@alcatel.at
  |  A L C A T E L  |	-----------------------------
  +-----------------+	Phone: +43 1 27722 3706	
         T A S		Fax:   +43 1 27722 3955