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

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Date:	Thu, 28 May 2009 18:17:41 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Mitch Bradley <wmb@...mworks.com>
Cc:	Timur Tabi <timur@...escale.com>,
	devicetree-discuss <devicetree-discuss@...abs.org>,
	Janboe Ye <yuan-bo.ye@...orola.com>,
	linux-kernel@...r.kernel.org, rmk@....linux.org.uk,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

On Thu, 2009-05-28 at 06:01 +0800, Mitch Bradley wrote:
> If anybody is interested, the core ARM support has been added to the 
> Open Firmware tree at svn://openfirmware.info/openfirmware - the same 
> version of OFW that's used on OLPC - under an MIT-style license. This is 
> a full-featured Open Firmware whose lineage traces back to the original 
> Open Boot implementation that I wrote for Sun starting in 1987.
> 
> It's not yet fully elaborated for specific platforms and devices, but it 
> does contain all the core IEE1275 device tree stuff and the standard 
> support packages.  It gets you to an ok prompt on Beagle Board and 
> Gumstix Overo systems.  The source-level and assembly-language debuggers 
> are fully functional. As currently configured on those systems, you can 
> load it into memory either via u-boot or instead of u-boot.
> 
> This base ARM port, while newly released as FOSS, is quite solid, having 
> been developed some years ago for the Digital (RIP) DNARD system.
> 
> I'd be happy to work with people to add deeper support for specific 
> device and platforms.

That's actually great news !

While most of the discussion here revolves around whether to use a
device-tree or not, mostly with the flattened device-tree format in
mind, having a real OF implementation is always a much better option
as far as I'm concerned.

Cheers,
Ben.


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