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Subject: RE: [PATCH 12/60] microblaze_v4: Generic dts file for platforms
Date: Tue, 1 Jul 2008 08:58:43 -0700
In-Reply-To: <1214893302.20711.102.camel@pasglop>
Thread-Topic: [PATCH 12/60] microblaze_v4: Generic dts file for platforms
Thread-Index: AcjbQz97k2rWIwwhS6euqvMxEdpVPgAT3xWQ
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From: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
To: <benh@kernel.crashing.org>
CC: "John Williams" <john.williams@petalogix.com>, <grant.likely@secretlab.ca>,
       <linux-arch@vger.kernel.org>, "Michal Simek" <monstr@monstr.eu>,
       <vapier.adi@gmail.com>, <arnd@arndb.de>, <matthew@wil.cx>,
       <microblaze-uclinux@itee.uq.edu.au>, <linux-kernel@vger.kernel.org>,
       <linuxppc-dev@ozlabs.org>, <will.newton@gmail.com>, <hpa@zytor.com>,
       "John Linn" <linnj@xilinx.com>, <monstr@seznam.cz>,
       <drepper@redhat.com>, <alan@lxorguk.ukuu.org.uk>
Message-ID: <20080701155845.9DDE299004D@mail180-dub.bigfish.com>
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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@kernel.crashing.org]
> Sent: Monday, June 30, 2008 11:22 PM
> To: Stephen Neuendorffer
> Cc: John Williams; grant.likely@secretlab.ca;
linux-arch@vger.kernel.org; Michal Simek;
> vapier.adi@gmail.com; arnd@arndb.de; matthew@wil.cx;
microblaze-uclinux@itee.uq.edu.au; linux-
> kernel@vger.kernel.org; linuxppc-dev@ozlabs.org;
will.newton@gmail.com; hpa@zytor.com; John Linn;
> monstr@seznam.cz; drepper@redhat.com; alan@lxorguk.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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