'console=' kernel parameter questions

'console=' kernel parameter questions

[Paul Powell]

Hello,

I am running an unmodified RedHat 6.2 kernel 
(kernel version 2.2.14-5.0)

I am trying to redirect the linux startup messages to
the serial port.  I've added the 'console=' parameter
to my lilo.conf file.  I've tried several iterations
such as
'console=ttys0','console=cua0','console=ttys0,9600n8',
etc....

They all fail to produce any output to the serial port
although they do remove the text from my screen.  When
I have booted RedHat I can type 'echo blah >
/dev/cua0' and I see text output from the serial port.
 Interestingly when I try to echo to /dev/ttys0 I get
an IO error message. I'm using a null modem cable
connect to a windows machine to watch the serial port.

My question: why can I see output when booted into
RedHat but not when booting the OS?  I've read that
you have to compile this feature into the kernel. 
Does anyone know if RedHat's kernel come with this
feature built in?

Your help appreciated,
Paul


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Re: 'console=' kernel parameter questions

[Matthew Kirkwood]

On Mon, 8 Jan 2001, Paul Powell wrote:

> 'console=ttys0','console=cua0','console=ttys0,9600n8', etc....
              ^

console=ttyS0

Matthew.

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Re: 'console=' kernel parameter questions

[Mohammad A. Haque]

I do believe RedHat kernels have this feature compiled in.

This is probably an typo in the email but it's /dev/ttyS0 . Note the
capital 'S'.

On Mon, 8 Jan 2001, Paul Powell wrote:

> Hello,
>
> I am running an unmodified RedHat 6.2 kernel
> (kernel version 2.2.14-5.0)
>
> I am trying to redirect the linux startup messages to
> the serial port.  I've added the 'console=' parameter
> to my lilo.conf file.  I've tried several iterations
> such as
> 'console=ttys0','console=cua0','console=ttys0,9600n8',
> etc....
>
> They all fail to produce any output to the serial port
> although they do remove the text from my screen.  When
> I have booted RedHat I can type 'echo blah >
> /dev/cua0' and I see text output from the serial port.
>  Interestingly when I try to echo to /dev/ttys0 I get
> an IO error message. I'm using a null modem cable
> connect to a windows machine to watch the serial port.
>
> My question: why can I see output when booted into
> RedHat but not when booting the OS?  I've read that
> you have to compile this feature into the kernel.
> Does anyone know if RedHat's kernel come with this
> feature built in?
>

-- 

=====================================================================
Mohammad A. Haque                              http://www.haque.net/
                                               mhaque@haque.net

  "Alcohol and calculus don't mix.             Project Lead
   Don't drink and derive." --Unknown          http://wm.themes.org/
                                               batmanppc@themes.org
=====================================================================

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Re: 'console=' kernel parameter questions

[Dr. Kelsey Hudson]

append="console=/dev/ttyS0"

that should do the trick

enjoy
-kelsery

On Mon, 8 Jan 2001, Paul Powell wrote:

> Hello,
> 
> I am running an unmodified RedHat 6.2 kernel 
> (kernel version 2.2.14-5.0)
> 
> I am trying to redirect the linux startup messages to
> the serial port.  I've added the 'console=' parameter
> to my lilo.conf file.  I've tried several iterations
> such as
> 'console=ttys0','console=cua0','console=ttys0,9600n8',
> etc....
> 
> They all fail to produce any output to the serial port
> although they do remove the text from my screen.  When
> I have booted RedHat I can type 'echo blah >
> /dev/cua0' and I see text output from the serial port.
>  Interestingly when I try to echo to /dev/ttys0 I get
> an IO error message. I'm using a null modem cable
> connect to a windows machine to watch the serial port.
> 
> My question: why can I see output when booted into
> RedHat but not when booting the OS?  I've read that
> you have to compile this feature into the kernel. 
> Does anyone know if RedHat's kernel come with this
> feature built in?
> 
> Your help appreciated,
> Paul
> 
> 
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Photos - Share your holiday photos online!
> http://photos.yahoo.com/
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> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> Please read the FAQ at http://www.tux.org/lkml/
> 

-- 
 Kelsey Hudson                                           khudson@ctica.com 
 Software Engineer
 Compendium Technologies, Inc                               (619) 725-0771
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