linux-kernel - Re: debug tip after earlycon is closed?

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Message-ID: <20160727021748.GA9857@earth>
Date:	Wed, 27 Jul 2016 04:17:49 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Hurley <peter@...leysoftware.com>,
	Rob Herring <robh+dt@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: debug tip after earlycon is closed?

Hi,

On Wed, Jul 27, 2016 at 10:23:09AM +0900, Masahiro Yamada wrote:
> When the kernel fails to boot and its log console is silent,
> I use earlycon and I often find the cause of error with it.
> 
> But, I have been wondering if there is an easy-to-use
> debug tip which is available after earlycon is disabled.
> 
> I noticed the current mainline would not boot on my ARMv8 board.
> According to the following log, I am guessing something wrong
> is happening after the "bootconsole [uniphier0] disabled" log.
> 
> Is there a good practice to see more log?

Documentation/kernel-parameters.txt 
	keep_bootcon	[KNL]
			Do not unregister boot console at start. This is only
			useful for debugging when something happens in the window
			between unregistering the boot console and initializing
			the real console.

-- Sebastian

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