How to generate zephyr.dtb for xenvm?

[madhusk]

I tried building the zephyr code for xenvm, able to generate zephyr.bin, but I don't see any .dtb getting generated (zephyr.dtb), do I need to set/configure something to generate the zephyr.dtb for xenvm?

[ldomaigne]

That's because there is no zephyr.dtb in zephyr! The "dtb" file is a header file, the devicetree can be query through C-macro. Everything is resolved at compiled time. See this documentation

The rational behind this choice is that many embedded systems do not have a file system. We could have embedded the ".dtb" in the image, but then it impacts RAM/ROM usage...

[madhusk]

Got it, thanks for your information.

[madhusk]

Hi ldomaigne,
If the I/O configs are packed into the bin (not in .dtb), then how to inform Xen that some I/Os are to be assigned to the Zephyr?

[ldomaigne]

Do I understand correctly that you need the .dtb to give the information to the Xen hypervisor?
I am not familiar with Xen, so takes my answer with a grain of salt.

You could perhaps use the dtc compiler to generate this file from zephyr.dts ?

$ dtc -I dts -O dtb -o zephyr.dtb build/zephyr/zephyr.dts 

[madhusk]

So that means, we can still pass the dtb to the zephyr right??

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On Fri, 14 Feb 2025 at 11:58 PM, Loïc Domaigné ***@***.***> wrote: Do I understand correctly that you need the .dtb to give the information to the Xen hypervisor? I am not familiar with Xen, so takes my answer with a grain of salt. You could perhaps use the *dtc* compiler to generate this file from zephyr.dts ? $ dtc -I dts -O dtb -o zephyr.dtb build/zephyr/zephyr.dts — Reply to this email directly, view it on GitHub <#85706 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABPD62QN5KP37RT7M6DO6T32PYYUHAVCNFSM6AAAAABXBOYYYKVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRQGQZTSOI> . You are receiving this because you authored the thread.Message ID: ***@***.*** .com>