linux-kernel - RE: [PATCH 12/60] microblaze_v4: Generic dts file for platforms

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Message-ID: <20080701155845.9DDE299004D@mail180-dub.bigfish.com>
Date:	Tue, 1 Jul 2008 08:58:43 -0700
From:	Stephen Neuendorffer <stephen.neuendorffer@...inx.com>
To:	<benh@...nel.crashing.org>
CC:	"John Williams" <john.williams@...alogix.com>,
	<grant.likely@...retlab.ca>, <linux-arch@...r.kernel.org>,
	"Michal Simek" <monstr@...str.eu>, <vapier.adi@...il.com>,
	<arnd@...db.de>, <matthew@....cx>,
	<microblaze-uclinux@...e.uq.edu.au>,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...abs.org>,
	<will.newton@...il.com>, <hpa@...or.com>,
	"John Linn" <linnj@...inx.com>, <monstr@...nam.cz>,
	<drepper@...hat.com>, <alan@...rguk.ukuu.org.uk>
Subject: RE: [PATCH 12/60] microblaze_v4: Generic dts file for platforms


Doing this at the binary level would be nice, but I see enough problems
just doing it at the source level and at least for my purposes, doing it
on a dtb would be overkill, I think.   

The main difficulty remains how to deal with cross references between
nodes in a reasonable way where the references cross from one fragment
to another.

Steve

> -----Original Message-----
> From: Benjamin Herrenschmidt [mailto:benh@...nel.crashing.org]
> Sent: Monday, June 30, 2008 11:22 PM
> To: Stephen Neuendorffer
> Cc: John Williams; grant.likely@...retlab.ca;
linux-arch@...r.kernel.org; Michal Simek;
> vapier.adi@...il.com; arnd@...db.de; matthew@....cx;
microblaze-uclinux@...e.uq.edu.au; linux-
> kernel@...r.kernel.org; linuxppc-dev@...abs.org;
will.newton@...il.com; hpa@...or.com; John Linn;
> monstr@...nam.cz; drepper@...hat.com; alan@...rguk.ukuu.org.uk
> Subject: RE: [PATCH 12/60] microblaze_v4: Generic dts file for
platforms
> 
> 
> > As for the copyright, I haven't been able to find much information
on
> > whether or not generated files are even copyrightable.  One might
> > argue that they
> > don't have sufficient 'creative value' to be copyrightable.  Or
> > arguably, they are as copyrightable by the generator author as by
the
> > author or the .mhs file.
> > I admit in this case, I've followed the safe route by claiming a
> > copyright, which at least at Xilinx has significant precedent.
> 
> Also, thinking about your idea of sticking bits in BRAM etc...
> 
> what would be nice would be the ability to "merge" trees. We've been
> talking about that multiple times, it would be useful at several
levels:
> 
>  - We could provide pre-made DTs for known CPUs (ie, 440GP, 440GX,
> 405EX, ...)
>  - Boards can then include that, and then "override" some properties
> (clocks, PHY wiring, ...)
>  - That could be done at the binary level too so that the BRAM
contains
> on "overlay" on top of the base ref. platform device-tree that comes
> with the kernel for example.
> 
> This is slightly different between doing that in the .dts source via
> some kind of #include vs. doing that by merging blobs but we could
make
> it be essentially be the same internally: The #include generates a
blob
> that is then "merged in".
> 
> Just random thoughts...
> 
> Ben.
> 
> 


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