linux-kernel - Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays

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Message-ID: <20131106190152.GA8662@breakpoint.cc>
Date:	Wed, 6 Nov 2013 20:01:52 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...akpoint.cc>
To:	Pantelis Antoniou <panto@...oniou-consulting.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Michael Stickel <ms@...able.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays

On 05.11.13, Pantelis Antoniou wrote:
> The following patchset introduces Device Tree overlays, a method
> of dynamically altering the kernel's live Device Tree, along with
> a generic interface to use it in a board agnostic manner.

In case this has been discussed and I missed it: Why are we doing this?
Isn't it possible to d o the overlay thingy in u-boot and pass a
complete device tree to the kernel?
Are you trying to do something like hotplug-PCI where the PCI card can
be replaced at runtime?

Sebastian
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