linux-kernel - Re: [PATCH v5 4/8] arm/dt: probe for platforms via the device tree

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Message-ID: <20110503104401.GQ2092@atomide.com>
Date:	Tue, 3 May 2011 03:44:01 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/8] arm/dt: probe for platforms via the device tree

* Grant Likely <grant.likely@...retlab.ca> [110502 14:52]:
> On Mon, May 02, 2011 at 07:39:54PM +0300, Tony Lindgren wrote:
> > 
> > The cmdline is something that bootloaders typically allow to configure,
> > while the other ATAGs are static and should be in the .dts file.
> 
> Once the libfdt code is pulled into to manipulate the command line,
> it becomes trivial to parse the rest of the atags too, so this
> probably won't make much difference (unless work is done to preparse
> the devicetree and provide to the zimage wrapper a direct offset to
> the cmdline buffer in the dtb, but that gets hairy and I really don't
> want to go down that path).
 
OK, makes sense.
  
> > > Adding a default command line to the .dts file instead of using
> > > CONFIG_CMDLINE_FORCE also works.
> > 
> > But that requires carrying extra patches for something that should
> > be user configured.. So not so nice for distros.
> 
> Right, so this is only a stop-gap solution.  I'll add this to the list
> of topics to discuss in the device tree session at Linaro@UDS next
> week.

Thanks

Tony
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