# Re: dts file for ep8548A board

- From: John Traill \<hidden\>
- Date: 2008-09-16 09:44:19 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2008/09/9445490
- Thread: https://ratatoskr.run/linuxppc-dev/2008/09/9445487/t.md

```text
Don't know if this helps but ..

The EP boards I've used have an old version of u-boot which don't support passing the device tree address so I've had to build a cuImage.

Cheers.

poornima r wrote:
> Hi all,
>
> I am working on ep8548A embedded planet board.
> I am using mpc8548cds dtb file (mpc8548cds.dts file in arch/powerpc/boot/dts directory of the kernel source) as my device tree file.
> I am tracing the kernel initilization path through BDI.
> The BDI tracing is hanging in early_init_devtree ( in machine_init function) if the r3 register (physical pointer to device tree block) is not set to dtb file loaded location in RAM.
> Once I set the r3 register manually in BDI (rm r3 <dtb file location>) the kernel is passing machine_init function (passing early_init_devtree( ) ).
> I tried  to statically set r3 register in head_fsl_booke.S  file by using ori instruction but I was not able to set the r3 value to dtb file RAM location.
> Are any changes necessary in mps8548cds.dts for ep8548A board?
> How do we and where should we set the r3 register value in head_fsl_booke.S file for device tree initilization?
>
> Thanks,
> Poornima
>  
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>
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-- 
John Traill
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