[U-Boot] dtb merge

[U-Boot] dtb merge

[Andre Schwarz]

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 ?

Is it already working - have I missed it ?

If not - is someone thinking/working on it ?

Any suggestions on how to do it ?



Regards,

Andre

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[U-Boot] dtb merge

[Jerry Van Baren]

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