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From: Tony Lindgren <tony@atomide.com>
To: Tabi Timur-B04825 <B04825@freescale.com>
Cc: Grant Likely <grant.likely@secretlab.ca>,
	Pantelis Antoniou <panto@antoniou-consulting.com>,
	Rob Herring <robherring2@gmail.com>,
	Deepak Saxena <dsaxena@linaro.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Wood Scott-B07421 <B07421@freescale.com>,
	Kevin Hilman <khilman@ti.com>, Matt Porter <mporter@ti.com>,
	Koen Kooi <koen@dominion.thruhere.net>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Felipe Balbi <balbi@ti.com>, Russ Dill <Russ.Dill@ti.com>,
	"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
	"devicetree-discuss@lists.ozlabs.org" 
	<devicetree-discuss@lists.ozlabs.org>
Subject: Re: [RFC] Device Tree Overlays Proposal (Was Re: capebus moving omap_devices to mach-omap2)
Date: Mon, 5 Nov 2012 15:22:19 -0800	[thread overview]
Message-ID: <20121105232218.GA8284@atomide.com> (raw)
In-Reply-To: <6AE080B68D46FC4BA2D2769E68D765B708174B7D@039-SN2MPN1-023.039d.mgd.msft.net>

Hi,

* Tabi Timur-B04825 <B04825@freescale.com> [121105 13:42]:
> On Mon, Nov 5, 2012 at 2:40 PM, Grant Likely <grant.likely@secretlab.ca> wrote:
> 
> > Jane is building custom BeagleBone expansion boards called 'capes'. She
> > can boot the system with a stock BeagleBoard device tree, but additional
> > data is needed before a cape can be used. She could replace the FDT file
> > used by U-Boot with one that contains the extra data, but she uses the
> > same Linux system image regardless of the cape, and it is inconvenient
> > to have to select a different device tree at boot time depending on the
> > cape.
> 
> What's wrong with having the boot loader detect the presence of the
> Cape and update the device tree accordingly?  We do this all the time
> in U-Boot.  Doing stuff like reading EEPROMs and testing for the
> presence of hardware is easier in U-Boot than in Linux.
> 
> For configurations that can be determined by the boot loader, I'm not
> sure overlays are practical.

I guess the beaglebone capes could be stackable and hotpluggable if
handled carefully enough.

Regards,

Tony

  reply	other threads:[~2012-11-05 23:22 UTC|newest]

Thread overview: 135+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-05 20:40 [RFC] Device Tree Overlays Proposal (Was Re: capebus moving omap_devices to mach-omap2) Grant Likely
2012-11-05 21:40 ` Tabi Timur-B04825
2012-11-05 21:40   ` Tabi Timur-B04825
2012-11-05 23:22   ` Tony Lindgren [this message]
2012-11-05 23:22     ` Tony Lindgren
2012-11-09 12:06     ` Grant Likely
2012-11-09 12:06       ` Grant Likely
2012-11-06  0:07   ` Grant Likely
2012-11-06  0:07     ` Grant Likely
2012-11-06 10:31   ` Pantelis Antoniou
2012-11-06 10:31     ` Pantelis Antoniou
2012-11-07 22:35   ` Ryan Mallon
2012-11-07 22:35     ` Ryan Mallon
2012-11-08 13:28     ` Koen Kooi
2012-11-08 13:28       ` Koen Kooi
2012-11-08 14:09       ` Timur Tabi
2012-11-08 14:09         ` Timur Tabi
2012-11-08 17:00       ` Mitch Bradley
2012-11-08 17:00         ` Mitch Bradley
2012-11-06 10:30 ` Pantelis Antoniou
2012-11-06 11:14   ` Grant Likely
2012-11-06 18:35     ` Tony Lindgren
2012-11-06 19:29       ` Russ Dill
2012-11-06 19:41         ` Pantelis Antoniou
2012-11-06 19:41           ` Pantelis Antoniou
2012-11-06 22:17           ` Stephen Warren
2012-11-06 22:17             ` Stephen Warren
2012-11-06 19:34     ` Pantelis Antoniou
2012-11-06 20:45       ` Grant Likely
2012-11-06 20:50         ` Grant Likely
2012-11-07  8:06         ` Pantelis Antoniou
2012-11-07 15:33           ` Alan Tull
2012-11-07 15:33             ` Alan Tull
2012-11-09 17:03           ` Grant Likely
2012-11-07  8:13         ` Pantelis Antoniou
2012-11-07 10:19           ` Benoit Cousson
2012-11-07 10:19             ` Benoit Cousson
2012-11-07 11:02             ` Pantelis Antoniou
2012-11-07 11:02               ` Pantelis Antoniou
2012-11-07 11:12               ` Benoit Cousson
2012-11-07 11:12                 ` Benoit Cousson
2012-11-07 11:23                 ` Pantelis Antoniou
2012-11-07 11:23                   ` Pantelis Antoniou
2012-11-09 20:33               ` Grant Likely
2012-11-12 11:34                 ` Pantelis Antoniou
2012-11-12 13:01                   ` Grant Likely
2012-11-07 17:25             ` Stephen Warren
2012-11-07 22:10               ` Pantelis Antoniou
2012-11-07 22:10                 ` Pantelis Antoniou
2012-11-08 10:36               ` Cousson, Benoit
2012-11-08 10:36                 ` Cousson, Benoit
2012-11-09  5:32   ` Joel A Fernandes
2012-11-09 14:29     ` David Gibson
2012-11-10  3:15       ` Joel A Fernandes
2012-11-09 21:22     ` Grant Likely
2012-11-12 11:47       ` Pantelis Antoniou
2012-11-12 11:47         ` Pantelis Antoniou
2012-11-13  3:59       ` Joel A Fernandes
2012-11-09 22:59     ` Stephen Warren
     [not found]   ` <-4237940489086529028@unknownmsgid>
     [not found]     ` <559B8433-67C3-4A1A-A5D6-859907655176@antoniou-consulting.com>
2012-11-10  3:36       ` Joel A Fernandes
2012-11-10  3:36         ` Joel A Fernandes
2012-11-12 12:48         ` Pantelis Antoniou
2012-11-13  2:28         ` David Gibson
2012-11-06 22:37 ` Stephen Warren
2012-11-06 22:37   ` Stephen Warren
2012-11-07  0:54   ` Mitch Bradley
2012-11-07  0:54     ` Mitch Bradley
2012-11-09 17:02     ` Grant Likely
2012-11-12 11:29       ` Pantelis Antoniou
2012-11-07  8:47   ` Pantelis Antoniou
2012-11-07 17:18     ` Stephen Warren
2012-11-07 22:08       ` Pantelis Antoniou
2012-11-07 22:08         ` Pantelis Antoniou
2012-11-09 16:28   ` Grant Likely
2012-11-09 23:23     ` Stephen Warren
2012-11-09 23:40       ` Grant Likely
2012-11-12 10:53         ` Koen Kooi
2012-11-12 12:10       ` Pantelis Antoniou
2012-11-12 12:10         ` Pantelis Antoniou
2012-11-12 16:52         ` Stephen Warren
2012-11-13  7:25           ` David Gibson
2012-11-13  8:09             ` Pantelis Antoniou
2012-11-13  8:09               ` Pantelis Antoniou
2012-11-13 12:24               ` Grant Likely
2012-11-13 13:38                 ` Pantelis Antoniou
2012-11-13 13:38                   ` Pantelis Antoniou
2012-11-15  4:57                   ` David Gibson
2012-11-13 17:10               ` Stephen Warren
2012-11-13 23:30               ` David Gibson
2012-11-13 23:30                 ` David Gibson
2012-11-14  0:00                 ` Pantelis Antoniou
2012-11-13 16:57             ` Stephen Warren
2012-11-13 18:10               ` Mitch Bradley
2012-11-13 18:10                 ` Mitch Bradley
2012-11-13 18:29                 ` Stephen Warren
2012-11-13 18:29                   ` Stephen Warren
2012-11-13 19:09                   ` Mitch Bradley
2012-11-13 19:11                     ` Pantelis Antoniou
2012-11-17 22:27       ` Jean-Christophe PLAGNIOL-VILLARD
2012-11-20 17:09         ` Grant Likely
2012-11-11 20:47     ` Rob Landley
2012-11-12 12:50       ` Pantelis Antoniou
2012-11-12 16:54         ` Stephen Warren
2012-11-12 16:54           ` Stephen Warren
2012-11-12 11:23     ` Pantelis Antoniou
2012-11-12 16:49       ` Stephen Warren
2012-11-12 17:00         ` Pantelis Antoniou
2012-11-12 17:10           ` Stephen Warren
2012-11-12 17:19             ` Pantelis Antoniou
2012-11-12 17:29               ` Stephen Warren
2012-11-12 17:38                 ` Pantelis Antoniou
2012-11-12 20:16       ` Russ Dill
2012-11-12 16:45     ` Stephen Warren
2012-11-09  2:26 ` David Gibson
2012-11-09 15:40   ` Pantelis Antoniou
2012-11-13  0:03     ` David Gibson
2012-11-13  0:03       ` David Gibson
2012-11-09 21:08   ` Grant Likely
2012-11-13  0:05     ` David Gibson
2012-11-13  0:05       ` David Gibson
2012-11-09 21:42   ` Grant Likely
2012-11-13  1:05     ` David Gibson
2012-11-13  1:05       ` David Gibson
2012-11-13  5:22       ` Stephen Warren
2012-11-13  6:54         ` David Gibson
2012-11-13  6:54           ` David Gibson
2012-11-09 22:57   ` Stephen Warren
2012-11-09 23:27     ` Grant Likely
2012-11-12 12:05     ` Pantelis Antoniou
2012-11-09 23:14   ` Stephen Warren
2012-11-09 23:14     ` Stephen Warren
2012-11-09 23:06 ` Stephen Warren
2012-11-09 23:32   ` Grant Likely
2012-11-12 11:03 ` Koen Kooi
2012-11-12 11:03   ` Koen Kooi

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