linux-kernel - Re: [PATCH v2] x86: Early-boot serial I/O support

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Date:	Sun, 11 Jul 2010 00:32:06 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Yinghai Lu <yinghai@...nel.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Cyrill Gorcunov <gorcunov@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2] x86: Early-boot serial I/O support

On Sun, Jul 11, 2010 at 12:27 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 07/10/2010 02:17 PM, Pekka Enberg wrote:
>> On Sat, Jul 10, 2010 at 11:49 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>>> can you analyze "console=uart8250,io,0x3f8,115200n8" instead?
>>>
>>> that is equal to "earlyprintk=ttyS0,115200 console=ttyS0,115200"
>>>
>>> so we only use one for all.
>>>
>>> also like to kill earlyprintk=ttyS0,115200 to favor earlycon
>>
>> hpa, what's your take on this?
>>
>> The 'console' variant seems overly complicated to me. We can add it
>> but we also need to check for 'earlyprintk' as long as it's supported
>> by the kernel.
>>
>
> earlyprintk= seems to be preferred over console= these days.  Quite
> frankly it's idiotic to have the user enter as many low-level details as
> one has to do for the console= one.
>
> Now, as for the I/O base, the I/O base for legacy serial ports are
> available from a 4-element u16 array starting at absolute address 0x400.
>  I don't think Linux currently examines that array -- instead relying on
> the hard-coded values 0x3f8, 0x2f8, 0x3e8, 0x2e8 -- but it might
> something to consider for the future.  However, we should match the
> serial port subsystem there, of course.

OK. The current patch should match 'earlyprintk' handling which uses
hard-coded values only.
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