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

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Message-ID: <20090527202701.GA16219@game.jcrosoft.org>
Date:	Wed, 27 May 2009 22:27:01 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	David Miller <davem@...emloft.net>
Cc:	rmk+lkml@....linux.org.uk, devicetree-discuss@...abs.org,
	linux-kernel@...r.kernel.org, timur@...escale.com,
	scottwood@...escale.com, yuan-bo.ye@...orola.com,
	linux-arm-kernel@...ts.arm.linux.org.uk, linux-sh@...r.kernel.org
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

On 13:23 Wed 27 May     , David Miller wrote:
> From: Russell King <rmk+lkml@....linux.org.uk>
> Date: Wed, 27 May 2009 20:29:10 +0100
> 
> > To program them into the hardware registers, which is not what we in
> > the ARM community say, but it's what the _network_ guys tell people
> > they should be doing.
> > 
> > I've suggested in the past having a standard kernel parameter such
> > that you can specify a mac address on a per-device basis in a totally
> > platform independent way, but the network folk don't like that idea.
> 
> As a "network guy" I can tell you that when the system firmware
> provides a system-wide or device specific MAC address in it's device
> tree, that is what you should use.
> 
> And that's what I've been doing on sparc FOR 15 YEARS.
> 
> Device trees are the only systematic generic mechanism for
> describing device layouts on the myriad of embedded boards
> out there which you will ever find.
> 
> Two platforms, and now a third, have been using this scheme
> over a very proven period of time.  It's not a hack, there is
> infrastructure to get the boot loaders to do the right thing,
> and only ARM seems to resist it. :-)
The SH, avr32, mips, x86 does not support it too IIRC

Best Regards,
J.
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