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From: Sudeep Holla <sudeep.holla-5wv7dgnIgG8@public.gmane.org>
To: Peter Hurley
	<peter-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>,
	Masahiro Yamada
	<yamada.masahiro-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org>,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-arm-kernel
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Sudeep Holla <sudeep.holla-5wv7dgnIgG8@public.gmane.org>
Subject: Re: Which is better to specify console, "console= " or "stdout-path" ?
Date: Wed, 21 Oct 2015 13:54:21 +0100	[thread overview]
Message-ID: <56278AFD.8000505@arm.com> (raw)
In-Reply-To: <56278911.9050704-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>



On 21/10/15 13:46, Peter Hurley wrote:
> On 10/21/2015 04:58 AM, Sudeep Holla wrote:
>> On 21/10/15 06:09, Masahiro Yamada wrote:
>>> I think there exist two ways to specify the console port and baudrate.
>>>
>>>
>>> [1] Specify console in bootargs
>>>
>>>     chosen {
>>>           bootargs = "console=ttyS0,115200";
>>>     };
>>>
>>>
>>> [2] Specify stdout-path
>>>
>>>      chosen {
>>>            stdout-path = "serial0:115200n8";
>>
>> This will work for even early/boot console, so this is better than
>> option [1]
>
> Be aware that options specified via /chosen/stdout-path are
> currently ignored by earlycon. There were some hiccups getting the
> initial support upstream; when 4.4 hits mainline, I'll resubmit
> my series that implements the of_serial i/o properties and
> options passthrough to earlycon setup.
>

Yes I am aware of that. IIUC it's in -next now and works fine for me.
But having stdout-path in the DTS won't hinder normal console in anyway.
So I prefer it even without the patch you are referring(to support early
console parsing stdout-path)

-- 
Regards,
Sudeep
--
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WARNING: multiple messages have this Message-ID (diff)
From: sudeep.holla@arm.com (Sudeep Holla)
To: linux-arm-kernel@lists.infradead.org
Subject: Which is better to specify console, "console= " or "stdout-path" ?
Date: Wed, 21 Oct 2015 13:54:21 +0100	[thread overview]
Message-ID: <56278AFD.8000505@arm.com> (raw)
In-Reply-To: <56278911.9050704@hurleysoftware.com>



On 21/10/15 13:46, Peter Hurley wrote:
> On 10/21/2015 04:58 AM, Sudeep Holla wrote:
>> On 21/10/15 06:09, Masahiro Yamada wrote:
>>> I think there exist two ways to specify the console port and baudrate.
>>>
>>>
>>> [1] Specify console in bootargs
>>>
>>>     chosen {
>>>           bootargs = "console=ttyS0,115200";
>>>     };
>>>
>>>
>>> [2] Specify stdout-path
>>>
>>>      chosen {
>>>            stdout-path = "serial0:115200n8";
>>
>> This will work for even early/boot console, so this is better than
>> option [1]
>
> Be aware that options specified via /chosen/stdout-path are
> currently ignored by earlycon. There were some hiccups getting the
> initial support upstream; when 4.4 hits mainline, I'll resubmit
> my series that implements the of_serial i/o properties and
> options passthrough to earlycon setup.
>

Yes I am aware of that. IIUC it's in -next now and works fine for me.
But having stdout-path in the DTS won't hinder normal console in anyway.
So I prefer it even without the patch you are referring(to support early
console parsing stdout-path)

-- 
Regards,
Sudeep

  parent reply	other threads:[~2015-10-21 12:54 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-21  5:09 Which is better to specify console, "console= " or "stdout-path" ? Masahiro Yamada
2015-10-21  5:09 ` Masahiro Yamada
     [not found] ` <CAK7LNAS9uBJ1cVmGBKae3W0tk8Siu1yeXOaeN6Kz11cksMqtsg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-21  7:43   ` Arnd Bergmann
2015-10-21  7:43     ` Arnd Bergmann
2015-10-21  8:58   ` Sudeep Holla
2015-10-21  8:58     ` Sudeep Holla
     [not found]     ` <562753A6.3070107-5wv7dgnIgG8@public.gmane.org>
2015-10-21 12:46       ` Peter Hurley
2015-10-21 12:46         ` Peter Hurley
     [not found]         ` <56278911.9050704-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2015-10-21 12:54           ` Sudeep Holla [this message]
2015-10-21 12:54             ` Sudeep Holla
     [not found]             ` <56278AFD.8000505-5wv7dgnIgG8@public.gmane.org>
2015-10-21 13:02               ` Peter Hurley
2015-10-21 13:02                 ` Peter Hurley
     [not found]                 ` <56278CF3.9010400-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2015-10-21 13:06                   ` Sudeep Holla
2015-10-21 13:06                     ` Sudeep Holla
2015-10-21 15:38           ` Masahiro Yamada
2015-10-21 15:38             ` Masahiro Yamada
     [not found]             ` <CAK7LNAQ_+_9K-y7bmpdGwcH2u4uqJhJhON1Ew4OvzSSa-amyvw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-21 16:26               ` Peter Hurley
2015-10-21 16:26                 ` Peter Hurley
     [not found]                 ` <5627BCBC.5040701-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
2015-10-22  4:20                   ` Masahiro Yamada
2015-10-22  4:20                     ` Masahiro Yamada
     [not found]                     ` <CAK7LNASqjd_Xf53WKa=Ogesf80HQzEoKEyVtw-BMh7JF=jq+xQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-28 16:00                       ` Peter Hurley
2015-10-28 16:00                         ` Peter Hurley

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