Re: Compiling barebox without PBL and using dts from Linux dts upstream for Zynq SoC

["Michał Kruszewski" <mkru@protonmail.com>]

> Do you use upstream or a fork? There seems to be no Z-turn board support upstream.

Upstream, release 2026.03.1.


> barebox can generate multiple images in a build, which image did you use?

I think I don't understand the question.


> Every barebox image on ARM has a prebootloader prepended that:
>
>   - decompresses barebox proper
>   - loads it and configures the MMU
>   - executes it while passing a device tree

How Does PBL pass a device tree to the barebox?


> I am looking at start_avnet_zedboard() and at the start of
> avnet_zedboard_ps7_init(), it skips the low level init if started
> second stage, which is what you seem to be after?

This is true.
However, I don't use the avnet zedboard board.
I don't want any code realted to some other board to be executed.
What is the point of this?
The FSBL has already configured everything at this stage.
If PBL is required, I just want minimal PBL that only does whatever is required to start barebox.
Is it possible to configure PBL in such a way?


> For quick testing, you can replace in arch/arm/dts/zynq-zed.dts
>
> #include <arm/xilinx/zynq-zed.dts>
>
> with your own board. Check that the stdout-path is correct.

If I do so, the dtb compilation fails with:
  FATAL ERROR: Couldn't open "zynq-zturn-common.dtsi": No such file or directory
'zynq-zturn-common.dtsi' is included in 'dts/src/arm/xilinx/zynq-zturn-v5.dts'.
Is is placed in the same directory as 'zynq-zturn-v5.dts' ('dts/src/arm/xilinx/').
If I replace
  /include/ "zynq-zturn-common.dtsi"
with
  /include/ "arm/xilinx/zynq-zturn-common.dtsi"
the dtc still can't find the file:
  FATAL ERROR: Couldn't open "arm/xilinx/zynq-zturn-common.dtsi": No such file or directory


> dts/ are just the device trees as they are in Linux. You can only build
> device tree in arch/${ARCH/dts/.
>
> You can read more about barebox device tree handling at:
>
> https://www.barebox.org/doc/latest/devicetree/index.html

So the help message of the Makefile in the dts directory is misleading.
Is is simply copied from the Linux?


Regards,
Michał Kruszewski