writing to serial console

writing to serial console

[Lee Chin]

Hi,
I'm trying to write status messages to the serial console as the kernel boots up.  I tried writing to ttyS0 in main.c, but the kernel crashes with a paging violation.  Is there an easy way to do this?

Thanks
Lee
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Re: writing to serial console

[Jan-Benedict Glaw]

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On Thu, 2002-07-04 10:14:50 -0500, Lee Chin <leechin@mail.com>
wrote in message <20020704151450.75171.qmail@mail.com>:
> Hi,
> I'm trying to write status messages to the serial console as the kernel boots up.  I tried writing to ttyS0 in main.c, but the kernel crashes with a paging violation.  Is there an easy way to do this?

Simply use printk() and boot up your kernel with "console=ttyS0" or like
that. See ./linux/Documentation/serial-console.txt .

MfG, JBG

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Jan-Benedict Glaw   .   jbglaw@lug-owl.de   .   +49-172-7608481
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Re: writing to serial console

[Keith Owens]

On Thu, 04 Jul 2002 10:14:50 -0500, 
"Lee Chin" <leechin@mail.com> wrote:
>I'm trying to write status messages to the serial console as the kernel boots up.  I tried writing to ttyS0 in main.c, but the kernel crashes with a paging violation.  Is there an easy way to do this?

printk() and a serial console.  Console output does not occur until
console_init().  To debug problems that occur before console_init(),
see these patches.

http://marc.theaimsgroup.com/?l=linux-kernel&m=101072840225142&w=2
http://marc.theaimsgroup.com/?l=linux-kernel&m=102386369913669&w=2