Date: Fri, 29 Aug 2008 09:54:08 +0200
From: Bernhard Walle <bwalle@suse.de>
Subject: Re: How do i see printf output from the purgatory code?
Message-ID: <20080829095408.22f50a3f@halley.suse.de>
In-Reply-To: <20080829051907.GA25758@verge.net.au>
References: <48B73F4C.5030206@sgi.com>
	<20080829051907.GA25758@verge.net.au>
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To: Simon Horman <horms@verge.net.au>
Cc: Jay Lan <jlan@sgi.com>, kexec@lists.infradead.org

Hi,

* Simon Horman [2008-08-29 15:19]:
>
> On Thu, Aug 28, 2008 at 05:14:04PM -0700, Jay Lan wrote:
> > Specifically, an ia64.
> > 
> > I added printf() to purgatory-ia64.c, compiled, and executed
> > the kexec command from a shell window (ie, not from a script), but
> > i still did not see the printf i put in.
> > 
> > Thanks for help in advance!
> 
> IIRC, the printf output in purgatory only shows on the VGA console.

No, you just have to call kexec with right parameters:

       --console-serial
              Enable the serial console.

       --serial=port
              Specify the serial port for debug output.

       --serial-baud=baud_rate
              Specify the baud rate of the serial port.

However, I don't know if it works on IA64, especially with SGI consoles
I think one would have to patch kexec.

Also, don't use --noio (which is the default on SUSE on IA64 because
we had problems on some machines without that parameter).


Bernhard
-- 
Bernhard Walle, SUSE Linux Products GmbH, Architecture Development

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