Re: [Celinux-dev] Invitation and RFC: Linux Plumbers Device Tree track proposed

From: Rob Landley
Date: Sat Apr 11 2015 - 20:05:53 EST

On Sat, Apr 11, 2015 at 2:20 PM, Rowand, Frank
<Frank.Rowand@xxxxxxxxxxxxxx> wrote:
> In recent years there have been proposed tools to aid in the creation of valid
> device trees and in debugging device tree issues. An example of this is the
> various approaches proposed (with source code provided) to validate device tree
> source against valid bindings. As of today, device tree related tools,
> techniques, and debugging infrastructure have not progressed very far. I have
> submitted a device tree related proposal for the Linux Plumbers 2015 conference
> to spur action and innovation in such tools, techniques, and debugging
> infrastructure.
> The current title of the track is "Device Tree Tools, Validation, and
> Troubleshooting". The proposal is located at
> I am looking for several things at the moment:
> 1) Suggestions of additional topics to be discussed.
> 2) Emails or other messages expressing an interest in attending the
> device tree track.
> 3) Commitments to attend the device tree track (the conference committee
> is looking at attendee interest and commitments as part of the process
> of accepting the device tree track).
> 4) Identifying additional people who should attend the device tree track.
> The desired outcome of the device tree track is to encourage the future
> development of tools, process, etc to make device tree related development,
> test, review and system administration more efficient, faster, easier, more
> robust, and to improve troubleshooting and debugging facilities. Some
> examples of areas of interest could include:
> - make it easier to create correct device tree source files
> - support for debugging incorrect device tree source files
> - create a kernel that correctly boots one or more specific device trees
> (eg a kernel configured to include the proper drivers and subsystems)
> - create drivers that properly work for a device tree binding definition
> - create drivers that support detecting errors in the related node(s) in
> a device tree
> The wiki page lists additional areas of interest.

Is there a device tree porting HOWTO anywhere? If I have a board
that's using explicit C initialization, and I want to convert it over
to device tree, step by step what do I do?

If I'm writing a new board support, what device tree bits do I need to
get a shell prompt on a serial port running out of initramfs?
(Physical memory, interrupt controller, timer to drive the scheduler,
serial chip...)

There's a bunch of device tree reference material out there, but no
tutorial material at all, that I can find...

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