linux-kernel - Re: [PATCH v3 05/10] serial: mps2-uart: add support for early console

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Message-ID: <56C6E42E.5070601@arm.com>
Date:	Fri, 19 Feb 2016 09:45:18 +0000
From:	Vladimir Murzin <vladimir.murzin@....com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
CC:	Mark Rutland <mark.rutland@....com>,
	devicetree <devicetree@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>, Arnd Bergmann <arnd@...db.de>,
	ijc+devicetree <ijc+devicetree@...lion.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	Jiri Slaby <jslaby@...e.cz>,
	linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 05/10] serial: mps2-uart: add support for early console

On 16/02/16 13:09, Vladimir Murzin wrote:
>>> +EARLYCON_DECLARE(mps2, mps2_early_console_setup);
>>> >> +OF_EARLYCON_DECLARE(mps2, "arm,mps2-uart", mps2_early_console_setup);
>> > 
>> > IIRC Peter Hurley mentioned you don't need to put both anymore, OF_
>> > one is enough.
>> > 
> I've just tried with OF_ only and seems it works fine. Thanks for
> pointing at it!
> 

..and the reason for that was that I had stdout pointing at uart node.
Now, while testing v4 I end-up with configuration:

1) no EARLYCON_DECLARE in mps2-uart.c
2) stdout not set
3) cmdline has "earlycon=mps2,0x40004000 console=/dev/ttyMPS"

and I don't see bootconsole, but if I avoid 1) everything works fine.
So, I'd leave EARLYCON_DECLARE in this patch.

Cheers
Vladimir