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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "David H. Lynch Jr." <dhlii@dlasys.net>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: device trees.
Date: Tue, 12 May 2009 08:29:22 +1000	[thread overview]
Message-ID: <1242080962.304.10.camel@pasglop> (raw)
In-Reply-To: <4A089AC8.9080704@dlasys.net>

On Mon, 2009-05-11 at 17:38 -0400, David H. Lynch Jr. wrote:
> Not only is the device tree expected to pass static hardware
> configuration information, but it is the sole means of passing
> anything.
> As an example Command lines are to be in the device tree.
> Everything is supposed to be in the device tree, whether that
> information is static or dynamic, whether it is hardware information,
> or user choices.
> 
>     That means that whether you are in a Sun or Apple Desktop or a
> system with the no flash and barely enough resources to run Linux,
> you still may have to manipulate the device tree.

To some extend, but the user choice information is well isolated, it's
all in /chosen, so it's really only that node that needs to be modified
or created from scratch by the bootloader.

Thus, your bootloader can pick the right static dtb for a given bitfile,
and then just use libfdt to generate the right /chosen node with other
informations.

Ben.

  reply	other threads:[~2009-05-11 22:29 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-08 16:03 device trees David H. Lynch Jr.
2009-05-08 17:15 ` Timur Tabi
2009-05-08 18:43 ` Kumar Gala
2009-05-09 20:51 ` Grant Likely
2009-05-11  2:00   ` Michael Ellerman
2009-05-11  4:08     ` Grant Likely
2009-05-11  6:32       ` David H. Lynch Jr.
2009-05-11 13:51         ` Grant Likely
2009-05-11 15:52           ` Stephen Neuendorffer
2009-05-11 16:58             ` David H. Lynch Jr.
     [not found]               ` <20090511183638.F07C01438054@mail184-wa4.bigfish.com>
     [not found]                 ` <4A08C599.2030100@dlasys.net>
     [not found]                   ` <20090512005554.EEE1019D009B@mail129-dub.bigfish.com>
2009-05-12  2:34                     ` David H. Lynch Jr.
2009-05-12  4:27                       ` Stephen Neuendorffer
2009-05-12  5:30                         ` Grant Likely
2009-05-13  0:10                           ` Stephen Neuendorffer
2009-05-13  2:36                             ` David Gibson
2009-05-13  4:03                               ` Grant Likely
2009-05-13  6:11                               ` David H. Lynch Jr.
2009-05-13  6:21                                 ` David Gibson
2009-05-13 18:11                                   ` David H. Lynch Jr.
2009-05-14  3:08                                     ` David Gibson
2009-05-14 12:51                                       ` David H. Lynch Jr.
2009-05-13  6:58                                 ` Stephen Neuendorffer
2009-05-11 16:45           ` David H. Lynch Jr.
2009-05-11 17:47             ` Grant Likely
2009-05-11 21:38               ` David H. Lynch Jr.
2009-05-11 22:29                 ` Benjamin Herrenschmidt [this message]
2009-05-11 22:56                 ` David Gibson
2009-05-12  2:37                   ` Michael Ellerman
2009-05-11 23:09                 ` Grant Likely
2009-05-12  1:12                   ` David Gibson
2009-05-12  5:22                     ` Grant Likely
2009-05-12 23:24                       ` David Gibson
2009-05-13  0:01                         ` Grant Likely
2009-05-13  0:13                         ` David H. Lynch Jr.
2009-05-13  1:15                           ` Grant Likely
2009-05-13  2:32                           ` David Gibson
2009-05-11 23:19                 ` Stephen Neuendorffer
2009-05-12  0:04                   ` Grant Likely
2009-05-12  7:38                     ` Wolfram Sang
2009-05-11 14:58         ` Timur Tabi
2009-05-11 16:54           ` David H. Lynch Jr.
2009-05-11 23:27             ` David Gibson
2009-05-11 22:25       ` Benjamin Herrenschmidt
     [not found] <20110703222042.19386c7wy7zfn4g8@webmail.huji.ac.il>
     [not found] ` <20110703222042.19386c7wy7zfn4g8-2RFepEojUI0+8gVPFGsyePqBs+8SCbDb@public.gmane.org>
2011-07-03 21:01   ` Device Trees Grant Likely

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