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

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Message-ID: <20090527204834.GA3095@hansolo.jdub.homelinux.org>
Date:	Wed, 27 May 2009 16:48:34 -0400
From:	Josh Boyer <jwboyer@...il.com>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Cc:	David Miller <davem@...emloft.net>, rmk+lkml@....linux.org.uk,
	devicetree-discuss@...abs.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk, scottwood@...escale.com,
	yuan-bo.ye@...orola.com, timur@...escale.com
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

On Wed, May 27, 2009 at 10:27:01PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
>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

x86 has a variant.  The OLPC uses OF.

josh
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