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.
next prev parent reply other threads:[~2009-05-11 22:29 UTC|newest]
Thread overview: 43+ 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
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