linux-kernel - Re: [PATCH v3 -next 11/11] serial: 8250_early: Remove setup_early_serial8250

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Date:	Fri, 03 Apr 2015 21:16:04 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jslaby@...e.cz>, Rob Herring <robh@...nel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v3 -next 11/11] serial: 8250_early: Remove setup_early_serial8250_console()

On 04/03/2015 08:52 PM, Yinghai Lu wrote:
> On Fri, Apr 3, 2015 at 11:27 AM, Peter Hurley <peter@...leysoftware.com> wrote:
>> On 04/03/2015 01:44 PM, Yinghai Lu wrote:
>>> On Fri, Apr 3, 2015 at 10:38 AM, Peter Hurley <peter@...leysoftware.com> wrote:
>>>> On 04/03/2015 12:57 PM, Yinghai Lu wrote:
>>>>
>>>> Wait -- you have earlycon in a product??
>>>
>>> What do you mean?
>>
>> I mean, what will happen if I put in a big debug banner like Steven
>> did for ftrace?
>>
>> Kernel developers need earlycon for debugging arch code; often the earlycon
>> is just hacked together especially when it requires fixmap support.
>>
>> Putting it in a product and _relying on undocumented behavior_ is a bad idea.
> 
> let me repeat again:
> when you have "console=uart8250,io,0x3f8", you will have earlycon and
> then console.
> 
> That is just for kernel developer for debugging.
> 
> When you have x86 with bunch of dimms and cpus, user will have to wait couple
> of minutes to output from console=ttyS0....and if it hang early, no
> one would know what happen.
> 
> Also it is only boot time only....

The fix is sitting in your inbox. Pointless to discuss it now.

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