linux-kernel - Re: earlycon: no match?

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Message-ID: <alpine.LFD.2.11.1505072241140.1538@eddie.linux-mips.org>
Date:	Thu, 7 May 2015 23:25:23 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Peter Hurley <peter@...leysoftware.com>
cc:	Robert Schwebel <r.schwebel@...gutronix.de>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: Re: earlycon: no match?

On Thu, 7 May 2015, Peter Hurley wrote:

> >  How does this overload interact with multiple `console=' options being 
> > present BTW, which one is considered the early console?  Or do we support 
> > driving multiple early consoles in parallel just as we do with regular 
> > consoles?
> 
> Please familiarize yourself with the existing 'console=' and 'earlycon='
> command line options documented in Documentation/kernel-parameters.txt

 Thank you for your suggestion, however that documentation does not answer 
my questions I am afraid (and neither does serial-console.txt).  Otherwise
I wouldn't have asked them in the first place.  If you don't know the 
answers either, then it's OK to say: "I don't know".

 E.g. (given the parameter aliasing we have) will:

`earlycon=uart8250,io,0x3f8 console=tty0'
`console=tty0 earlycon=uart8250,io,0x3f8'

do what I expect it to, that is open the UART at 0x3f8 as an early console 
and then hand it over to the ttyS0 device as respectively a secondary and 
the primary (/dev/console) regular console?  I've skipped options such as 
baud rates for brevity.

  Maciej
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