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Date: Thu, 16 Oct 2008 09:23:39 -0700
From: Yinghai Lu <yinghai@kernel.org>
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To: Paul Bolle <pebolle@tiscali.nl>
CC: n0ano@n0ano.com, donald.d.dugger@intel.com, linux-kernel@vger.kernel.org,
       Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] Enable console on PCI serial devices
References: <200810142231.m9EMV95O002974@los-vmm.sc.intel.com>	 <86802c440810141539x97ceaa4meaab109fae3d9d4c@mail.gmail.com>	 <20081014233031.GB14490@xolotl.n0ano.com>	 <1224061999.25929.7.camel@test.thuisdomein>	 <20081015204850.GC14490@xolotl.n0ano.com> <1224153822.3587.23.camel@test.thuisdomein>
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Paul Bolle wrote:
> On Wed, 2008-10-15 at 14:48 -0600, n0ano@n0ano.com wrote:
>> On Wed, Oct 15, 2008 at 11:13:19AM +0200, Paul Bolle wrote:
>> As an aside, I would personally be in favor of removing the `earlycon'
>> kernel parameter entirely, it seems to be a strict subset of the
>> `console' parameter and anyone that wants `earlycon' probably wants
>> `console' anyway.  Is there a strong argument for keeping that
>> parameter that I'm missing?
> 
> The same thing puzzles me too. Note that earlyprintk=serial|ttyS?[...]
> also provides a similar feature.
> 
>>        earlycon=       [KNL] Output early console device and options.
>> -               uart[8250],io,<addr>[,options]
>> -               uart[8250],mmio,<addr>[,options]
>> +               uart[8250],io,<addr>[,options,[clkd]]
>> +               uart[8250],mmio,<addr>[,options,[clkd]]
> 
> clkd?

earlycon= and conole= share uart[8250]...

the difference console= will start from early console and switch normal console automatically if the ttyS come out with same io/mmio address etc.

YH
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