linux-kernel - Re: [patch 2/7] dt: dtb version: document chosen/dtb-info node binding

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Message-ID: <20150319185306.GB11683@leverpostej>
Date:	Thu, 19 Mar 2015 18:53:06 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Rob Herring <robherring2@...il.com>,
	Frank Rowand <frowand.list@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Michal Marek <mmarek@...e.cz>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [patch 2/7] dt: dtb version: document chosen/dtb-info node
 binding

> And yes, you are right - anything like this which we add immediately
> becames a user ABI which becomes *very* difficult to change later, so
> in order to accept anything like this, we have to be absolutely sure
> that this is something we really really really really want to do.  Let
> me put it another way: once this is accepted, it will probably be
> impossible to ever change it.

Agreed.

Having debugged issues with bad DTBs in the past without having this
information, I don't see it as being majorly helpful -- the DTB is
relatively simple and can be decompiled.

You don't gain much from being able to read which file it was built from
on a random server you don't have access to, and if you do have access
to the source it's relatively easy to discover the file it was built
from.

So unless there's a really compelling case for this, I don't see the
point in having it.

Mark.
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