From: Pantelis Antoniou <panto@antoniou-consulting.com>
To: Sebastian Andrzej Siewior <bigeasy@breakpoint.cc>
Cc: Grant Likely <grant.likely@secretlab.ca>,
Rob Herring <robherring2@gmail.com>,
Stephen Warren <swarren@wwwdotorg.org>,
Matt Porter <matt.porter@linaro.org>,
Koen Kooi <koen@dominion.thruhere.net>,
Alison Chaiken <Alison_Chaiken@mentor.com>,
Dinh Nguyen <dinh.linux@gmail.com>, Jan Lubbe <jluebbe@lasnet.de>,
Alexander Sverdlin <alexander.sverdlin@nsn.com>,
Michael Stickel <ms@mycable.de>,
Guenter Roeck <linux@roeck-us.net>,
Dirk Behme <dirk.behme@gmail.com>,
Alan Tull <delicious.quinoa@gmail.com>,
Sascha Hauer <s.hauer@pengutronix.de>,
Michael Bohan <mbohan@codeaurora.org>,
Ionut Nicu <ioan.nicu.ext@nsn.com>,
Michal Simek <monstr@monstr.eu>,
Matt Ranostay <mranostay@gmail.com>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays
Date: Wed, 6 Nov 2013 21:08:15 +0200 [thread overview]
Message-ID: <C10E33D7-53F6-4A50-9B84-1149DDBDC46F@antoniou-consulting.com> (raw)
In-Reply-To: <20131106190152.GA8662@breakpoint.cc>
Hi Sebastian,
On Nov 6, 2013, at 9:01 PM, Sebastian Andrzej Siewior wrote:
> 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?
>
It has been discussed.
We are doing it because
a) We tried to do it in u-boot and it has been a complete disaster.
Regular users just can't handle bootloader updates.
b) It is similar to that. It was originally created for the beaglebone,
which has a concept of capes (similar to Arduino shields).
http://circuitco.com/support/index.php?title=BeagleBone_Capes
Turns out it's really useful to anyone doing reconfigurable hardware too,
so that's why FPGA people are thinking of using it.
c) There are people that want to tinker with Linux based hardware boards
but are not kernel developers. This gives them a way to do so without
having to recompile the kernel and/or reboot while tinkering.
> Sebastian
Regards
-- Pantelis
next prev parent reply other threads:[~2013-11-06 19:08 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-05 18:41 [PATCH 0/3 - V2] Introducing Device Tree Overlays Pantelis Antoniou
2013-11-05 18:41 ` [PATCH 1/3] OF: Introduce Device Tree resolve support Pantelis Antoniou
2013-11-06 15:59 ` Alexander Sverdlin
2013-11-06 16:24 ` Ionut Nicu
2013-11-05 18:41 ` [PATCH 2/3] OF: Introduce DT overlay support Pantelis Antoniou
2013-11-06 16:00 ` Alexander Sverdlin
2013-11-06 16:26 ` Ionut Nicu
2013-11-06 20:41 ` Dinh Nguyen
2013-11-07 7:10 ` Pantelis Antoniou
2013-11-05 18:41 ` [PATCH 3/3] DT: proc: Add runtime overlay interface in /proc Pantelis Antoniou
2013-11-06 9:51 ` Ionut Nicu
2013-11-06 9:57 ` Pantelis Antoniou
2013-11-06 19:10 ` Rob Herring
2013-11-06 19:24 ` Pantelis Antoniou
2013-11-06 20:16 ` Matt Porter
2013-11-07 7:44 ` Pantelis Antoniou
2013-11-07 23:38 ` delicious quinoa
2013-11-08 7:12 ` Pantelis Antoniou
2013-11-05 19:06 ` [PATCH 0/3 - V2] Introducing Device Tree Overlays Guenter Roeck
2013-11-06 0:15 ` Dinh Nguyen
2013-11-06 8:53 ` Alexander Sverdlin
2013-11-06 19:01 ` Sebastian Andrzej Siewior
2013-11-06 19:08 ` Pantelis Antoniou [this message]
2013-11-06 20:31 ` Sebastian Andrzej Siewior
2013-11-06 20:41 ` Sebastian Andrzej Siewior
2013-11-07 7:24 ` Pantelis Antoniou
2013-11-07 7:23 ` Pantelis Antoniou
2013-11-07 9:45 ` Alexander Sverdlin
2013-11-06 19:30 ` Guenter Roeck
2013-11-06 20:38 ` Sebastian Andrzej Siewior
2013-11-06 21:17 ` Guenter Roeck
2013-11-07 7:27 ` Pantelis Antoniou
2013-11-07 19:25 ` Sebastian Andrzej Siewior
2013-11-07 20:06 ` Pantelis Antoniou
2013-11-07 20:46 ` Sebastian Andrzej Siewior
2013-11-07 23:00 ` Guenter Roeck
2013-11-08 7:12 ` Pantelis Antoniou
2013-11-08 8:40 ` Sebastian Andrzej Siewior
2013-11-08 7:09 ` Pantelis Antoniou
2013-11-11 17:04 ` Grant Likely
2013-11-12 8:16 ` Pantelis Antoniou
2013-11-07 22:51 ` Guenter Roeck
2013-11-07 22:22 ` Guenter Roeck
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