linux-kernel - Re: [RFC] [PATCH] Device Tree on ARM platform

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Message-ID: <fa686aa40905280739u43270779w7023bfceebff230d@mail.gmail.com>
Date:	Thu, 28 May 2009 08:39:40 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Jon Smirl <jonsmirl@...il.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Scott Wood <scottwood@...escale.com>,
	devicetree-discuss <devicetree-discuss@...abs.org>,
	linux-kernel@...r.kernel.org, Timur Tabi <timur@...escale.com>,
	Janboe Ye <yuan-bo.ye@...orola.com>,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

On Thu, May 28, 2009 at 6:47 AM, Jon Smirl <jonsmirl@...il.com> wrote:
> On Thu, May 28, 2009 at 5:15 AM, Russell King - ARM Linux
> For ARM the model could be to use the machine number to load a device
> tree built into the kernel (these trees would slowly migrate into the
> firmware). After the device tree is selected the machine specific code
> would add the override function pointers. Unified OF aware device
> drivers would load using the device tree. These drivers would find the
> function pointers and use them to implement machine specific features.

Nagging point: it is not encouraged to move the device tree into the
firmware.  It is useful to *pass* the device tree via the kernel, but
hard linking it in is the way of pain because it makes updates hard.
This is probably what you meant, but I wanted to clarify.

g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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