linux-kernel - Re: [PATCH] x86: Setup early console as early as possible

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Message-ID: <4C3CA5A9.6000607@cs.helsinki.fi>
Date:	Tue, 13 Jul 2010 20:43:05 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Setup early console as early as possible

Hi Yingahai,

Yinghai Lu wrote:
> On 07/12/2010 08:47 AM, H. Peter Anvin wrote:
>> On 07/12/2010 01:58 AM, Pekka Enberg wrote:
>>> Hi Yinghai,
>>>
>>> Yinghai Lu wrote:
>>>> Analyze "console=uart8250,io,0x3f8,115200n8" in
>>>> i386_start_kernel/x86_64_start_kernel,
>>>> and call setup_early_serial8250_console() to init early serial console.
>>>>
>>>> only can handle io port kind of 8250. because mmio need ioremap.
>>>>
>>>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>>> What's the purpose of this patch? Does it make my early boot I/O patch
>>> obsolete?
>>>
>>>             Pekka
>> No, they're complementary.  Your patch serial-port enables the RM
>> kernel, whereas Yinghai pushes the initialization earlier in the PM kernel.
> 
> yes. cover more range.
> 
> Can you consider to ask Pekka to anaylze "console=uart8250,io, 0x3f8,115200n8" instead?
> 
> it looks like we can remove "earlyprintk=ttyS0,115200", or "earlyprintk=serial" etc.
> 
> earlycon=uart8250 or console=uart8250 should be better than earlyprintk.
> because it is shared between different archs already.

So just to clarify: I wasn't ignoring your comment here. I simply 
followed hpa's recommendation on which I also happen to agree with 
completely. ;-)

			Pekka
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