linux-kernel - Re: [PATCH]serial: make early_uart to use early_prarm instead of console

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Message-ID: <20070521104221.GU2012@bingen.suse.de>
Date:	Mon, 21 May 2007 12:42:21 +0200
From:	Andi Kleen <ak@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Yinghai Lu <Yinghai.Lu@....COM>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Gerd Hoffmann <kraxel@...hat.com>, Andi Kleen <ak@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH]serial: make early_uart to use early_prarm instead of console_initcall

On Sun, May 20, 2007 at 08:23:32PM -0700, Andrew Morton wrote:
> On Fri, 18 May 2007 19:00:16 -0700 Yinghai Lu <Yinghai.Lu@....COM> wrote:
> 
> > [PATCH]serial: make early_uart to use early_prarm instead of console_initcall
> > 
> > Make early_uart to use early_param, so uart console can be used earlier.
> > Make it to be bootconsole with CON_BOOT flag, so can use console handover
> > feature. and it will switch to corresponding normal serial console automatically.
> > new command line will be
> > 
> > earlycon=uart,io,0x3f8,9600n8
> > earlycon=uart,io,0x3f8,9600n8 console=tty0
> > 
> > it will print in very early stage
> > Early serial console at I/O port 0x3f8 (options '9600n8')
> > later for console it will print
> > console handover: boot [uart0] -> real [ttyS0]
> 
> I'll queue this up for some testing, but I'd be a bit reluctant to send it
> into Linus due to my poor understanding of what it actually does.  What
> _is_ an early console, and how does it differ from a non-early one?

It is someone's reimplemention of earlyprintk= for another architecture
that happens to mostly work on x86 too because the code is not ifdeffed. 
I don't think it makes much sense on x86 though because earlyprintk exists.

-Andi

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