linux-kernel - Re: [patch] Fixes and cleanups for earlyprintk aka boot console.

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Message-ID: <45EBC8F2.4040501@suse.de>
Date:	Mon, 05 Mar 2007 08:38:26 +0100
From:	Gerd Hoffmann <kraxel@...e.de>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	benh@...nel.crashing.org
Subject: Re: [patch] Fixes and cleanups for earlyprintk aka boot console.

Paul Mackerras wrote:
> Gerd Hoffmann writes:
> 
>> This patch fixes the console selection code to *not* consider a boot
>> console a full-featured one, so the first non-boot console registering
>> will become the default console instead.  This way the unregister call
>> for the boot console in the register_console() function actually
>> triggers and the handover from the boot console to the real console
>> device works smoothly.  Added a printk for the handover, so you know
>> which console device the output goes to when the boot console stops
>> printing messages.
> 
> You have removed functionality that is useful for debugging, that 3
> architectures had, namely a way to keep using the early boot console
> and not replace it with a console that comes later, using a kernel
> command line option.  Perhaps you could provide a way to do that in
> your patch.

--verbose please.  I don't think I broke that.

I've seen code for that in i386/x86_64 and one of the other archs (via
earlyprintk=foo,keep).  The code clears now the CON_BOOT flag in case
keep is present, which has the wanted effect:  The earlyprintk console
will not be replaced.

cheers,
  Gerd

-- 
Gerd Hoffmann <kraxel@...e.de>
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