linux-kernel - Re: console vs earlycon ?

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Message-ID: <4134303.BAT7dSJRN3@wuerfel>
Date:	Thu, 22 Oct 2015 00:54:28 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Peter Hurley <peter@...leysoftware.com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Stefan Agner <stefan@...er.ch>, linux-serial@...r.kernel.org
Subject: Re: console vs earlycon ?

On Wednesday 21 October 2015 15:24:41 Peter Hurley wrote:
> On 10/21/2015 03:00 PM, Arnd Bergmann wrote:

> > Yes, I see this as a tradeoff: we want the console to be as early as
> > possible in order to report boot-time errors to the user, but not so early
> > to require hacks that can cause problems themselves. earlycon has to
> > do some scary stuff and is relatively recent, while the hacks
> > necessary for console_init() are much older and better tested.
> 
> I assume you mean the hacks necessary to get _earlycon_ working at
> console_init() time, because the hacks necessary to get non-8250
> serial consoles working at console_init() would be extensive and
> brand new.
> 

No, I was just being slow and assumed that the 51 drivers that come with
a console_initcall() do something in there to actually start the console,
but you are right that most of them don't actually do that. They just
call register_console() and wait for the device to show up later.

	Arnd
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