Which branch for adding basic device tree support?

Grant Likely grant.likely at secretlab.ca
Fri Mar 25 20:56:30 UTC 2011


On Fri, Mar 25, 2011 at 2:21 PM, Tixy <tixy at yxit.co.uk> wrote:
> On Fri, 2011-03-25 at 12:47 -0600, Grant Likely wrote:
>> On Fri, Mar 25, 2011 at 12:22 PM, Tixy <tixy at yxit.co.uk> wrote:
> [...]
>> >
>> > "Allow the device tree binary to be appended to zImage"
>> > http://www.spinics.net/lists/arm-kernel/msg119379.html
>>
>> You don't need this patch for what needs to be changed to the hwpack.
>> I may add this one for the 11.05 release, but it is not required when
>> u-boot passes the .dtb image.
>
> That was one of the clues I was missing :-) Are there any instructions
> anywhere for getting U-Boot to pass a device tree?

Yes, look at what I wrote in the device tree status update Sunday
night for the config bits:

http://lists.ozlabs.org/pipermail/devicetree-discuss/2011-March/005024.html

> From looking at the uboot source I see the flattened device tree file is
> the 3rd argument to bootm, and I've found mkimage has a flat_dt type

Don't use mkimage on the dtb.  Just load the raw dtb into RAM and pass
the base address in the 3rd argument.

> option. But I think I'm still missing something. I can carry on
> analysing U-Boot code but would be grateful for any tips on now to get
> my dtb file seen by a running kernel.
>

g.



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