Re: [OE-core][meta][PATCH v2] uki.bbclass: make DTB packaging optional

["Mathieu Dubois-Briand" <mathieu.dubois-briand@bootlin.com>]

On Wed Mar 11, 2026 at 1:25 PM CET, Viswanath Kraleti via lists.openembedded.org wrote:
> According to the Unified Kernel Image (UKI) specification [1], including
> a compiled device tree in the .dtb section of a UKI is optional. However,
> the current implementation always packages device trees listed in
> KERNEL_DEVICETREE into the UKI by default. This makes uki.bbclass
> unsuitable for systems that rely on firmware-provided DTBs and do not
> want a DTB embedded in the UKI.
>
> Fix this by introducing a new UKI_DEVICETREE variable to control device
> tree packaging. The .dtb section is now populated from UKI_DEVICETREE
> instead of KERNEL_DEVICETREE. Users who do not want DTBs included in the
> UKI can override UKI_DEVICETREE to an empty value from their recipes.
>
> Update the UKI selftests accordingly, as QEMU does not provide a device
> tree to embed.
>
> [1] https://uapi-group.org/specifications/specs/unified_kernel_image/
>
> Signed-off-by: Viswanath Kraleti <viswanath.kraleti@oss.qualcomm.com>
> ---

Hi Viswanath,

Thanks for the new version.

It looks like one of the selftest is still failing:

2026-03-11 20:52:20,986 - oe-selftest - INFO - wic.Wic2.test_efi_plugin_unified_kernel_image_qemu (subunit.RemotedTestCase)
2026-03-11 20:52:20,987 - oe-selftest - INFO -  ... FAIL
...
2026-03-11 20:52:20,987 - oe-selftest - INFO - 13: 48/73 559/681 (145.46s) (0 failed) (wic.Wic2.test_efi_plugin_unified_kernel_image_qemu)
2026-03-11 20:52:20,987 - oe-selftest - INFO - testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/srv/pokybuild/yocto-worker/oe-selftest-debian/build/layers/openembedded-core/meta/lib/oeqa/core/decorator/__init__.py", line 35, in wrapped_f
    return func(*args, **kwargs)
  File "/srv/pokybuild/yocto-worker/oe-selftest-debian/build/layers/openembedded-core/meta/lib/oeqa/selftest/cases/wic.py", line 1561, in test_efi_plugin_unified_kernel_image_qemu
    bitbake('core-image-base ovmf')
  File "/srv/pokybuild/yocto-worker/oe-selftest-debian/build/layers/openembedded-core/meta/lib/oeqa/utils/commands.py", line 236, in bitbake
    return runCmd(cmd, ignore_status, timeout, output_log=output_log, **options)
  File "/srv/pokybuild/yocto-worker/oe-selftest-debian/build/layers/openembedded-core/meta/lib/oeqa/utils/commands.py", line 214, in runCmd
    raise AssertionError("Command '%s' returned non-zero exit status %d:\n%s" % (command, result.status, exc_output))
AssertionError: Command 'bitbake  core-image-base ovmf' returned non-zero exit status 1:
...
ERROR: core-image-base-1.0-r0 do_uki: ERROR: cannot find /srv/pokybuild/yocto-worker/oe-selftest-debian/build/build-st-4172893/tmp/deploy/images/qemux86-64/${KERNEL_DEVICETREE}.

https://autobuilder.yoctoproject.org/valkyrie/#/builders/35/builds/3383
https://autobuilder.yoctoproject.org/valkyrie/#/builders/48/builds/3273

Can you have a look at the issue?

Thanks,
Mathieu

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com