linux-kernel - Re: [PATCH v6 05/10] ARM: dts: Fill in bootargs for exynos5250-snow

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Message-ID: <53DC4A4F.8060009@collabora.co.uk>
Date:	Sat, 02 Aug 2014 04:17:51 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Andreas Färber <afaerber@...e.de>,
	linux-samsung-soc@...r.kernel.org
CC:	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	Stephan van Schaik <stephan@...khronix.com>,
	Vincent Palatin <vpalatin@...omium.org>,
	Doug Anderson <dianders@...omium.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 05/10] ARM: dts: Fill in bootargs for exynos5250-snow

Hello Andreas,

Sorry for missing your v5.

On 08/02/2014 02:52 AM, Andreas Färber wrote:
>  
>  	chosen {
> +		bootargs = "console=tty1";
>  	};

While I agree with you that having a chosen node with a default bootargs is
better than having an empty one, I second Doug that this bootargs is not very
useful.

If you want to add a bootargs in the DTS I think that it should be a complete
kernel command line that allows to boot a system. I would at least add a root
parameter and possibly another console for the serial port. So if
CMDLINE_FROM_BOOTLOADER is not set then the DT can be used to specify the
bootargs instead of using whatever was set in CONFIG_CMDLINE which probably
won't be relevant for every system on a multi-platform kernel.

But I think that is safe to rely on the bootloader to set the bootargs and after
all having a hardcoded bootargs in the DTS is not much better than having a
hardcoded CONFIG_CMDLINE since as Doug said it is hard to make assumptions about
what would be the most common options.

Personally I would just drop this change and as I said before remove the empty
chosen node on a follow up patch but I don't have a strong opinion either.

Best regards,
Javier
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