From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jerry Van Baren <gerald.vanbaren@ge.com>
Date: Wed, 08 Apr 2009 12:10:44 -0400
Subject: [U-Boot] dtb merge
In-Reply-To: <49DCC565.6030409@matrix-vision.de>
References: <49DCC565.6030409@matrix-vision.de>
Message-ID: <49DCCC84.8060400@ge.com>
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To: u-boot@lists.denx.de

Hi Andre,

Andre Schwarz wrote:
> Any ideas on how to merge device tree binaries from slave devices ?
> 
> Having a PowerPC based board with various extension boards on e.g. the 
> local bus with each board having some kind of PROM device (I2C, SPI 
> etc.) containing a dtb ... is it possible to merge this into the 
> existing boards dtb into the local bus node ?

Yes.

> Is it already working - have I missed it ?

No - no.

> If not - is someone thinking/working on it ?

We have thought about it, nobody is working on it that I am aware of.

> Any suggestions on how to do it ?

See limited thoughts in
   <http://www.denx.de/wiki/U-Boot/UBootFdtInfo>

4. Proposed additional fdt commands

     * merge - merge two trees. Need a conflict resolution: source tree 
#1 has priority?
           o David Gibson has talked about creating a "graft" function 
for libfdt.

Link to David's "graft" function thoughts:
   <http://article.gmane.org/gmane.linux.ports.ppc64.devel/35740>


> Regards,
> 
> Andre

Best regards,
gvb