From mboxrd@z Thu Jan  1 00:00:00 1970
From: peter@hurleysoftware.com (Peter Hurley)
Date: Wed, 21 Oct 2015 08:46:09 -0400
Subject: Which is better to specify console, "console= " or "stdout-path" ?
In-Reply-To: <562753A6.3070107@arm.com>
References: <CAK7LNAS9uBJ1cVmGBKae3W0tk8Siu1yeXOaeN6Kz11cksMqtsg@mail.gmail.com>
 <562753A6.3070107@arm.com>
Message-ID: <56278911.9050704@hurleysoftware.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

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.

Regards,
Peter Hurley