[meta-xilinx] modify the device tree in custom layer

[Toby Gomersall]

Thank you, I was away for a while but I think I've managed to get this
working after looking at parallella.

On 23/11/15 09:13, Nathan Rossi wrote:
> On Fri, Nov 20, 2015 at 9:34 PM, Toby Gomersall
> <toby.gomersall at smartacoustics.co.uk> wrote:
>> Hi,
>>
>> I'm trying to modify the device tree from my own layer. What is the best
>> way to do this?
> 
> There is no 'best' way IMO, but instead a few different ways depending
> on your use case and intended goal.
> 
> Some users like to make use of the kernel device trees either by
> providing patches to the kernel to adding their device tree or
> upstreaming changes to mainline/linux-xlnx. Other users prefer to keep
> static device trees that are either hand crafted or generated by the
> Xilinx tools. It really does depend on how you want to work.
> 
>>
>> I have got the system working by adding to the zedboard-zynq7-board.dtsi
>> within meta-xilinx but I want to move this modification to my own layer.
>>
>> I have tried Creating my own custom.dts and custom.dtsi files, then
>> appended the MACHINE_DEVICETREE variable to point to them. I thought
>> that the device-tree.bb recipe in meta-xilinx would pull in my additions
>> but I just get errors when I try to build.
>>
>> Have I missed a step or is there a better way to achieve this?
> 
> MACHINE_DEVICETREE can use device trees put into the device-tree
> recipe (via bbappend/etc) or automatically located from the
> conf/machine/boards directory of any available layer. For example see
> how the meta-parallella layer uses MACHINE_DEVICETREE.
> 
> https://github.com/nathanrossi/meta-parallella/tree/master/conf/machine/boards/parallella
> 
> You will also note that it takes advantage of the device trees
> provided in the linux-parallella kernel when available:
> 
> https://github.com/nathanrossi/meta-parallella/blob/master/recipes-kernel/linux/linux-parallella-machines.inc
> 
> Regards,
> Nathan
> 
>>
>> Thanks,
>> Toby
>>
>>
>> --
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>>

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