Thank you very much. I figured out that you can have Yocto create a suitable
U-Boot wrapper as follows (from the image recipe):
IMAGE_FSTYPES = "cpio.xz.u-boot"
Now there is only one last issue that I wasn't able to solve yet: I would like
Yocto to not only generate this U-Boot file but also add it to the boot
partition of a wic.gz image. I tried to extend the image recipe as follows:
IMAGE_FSTYPES = "cpio.xz.u-boot wic.gz"
IMAGE_BOOT_FILES_append += "${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.cpio.xz.u-boot"
Unfortunately, there is a dependency issue here. BitBake schedules the
do_image_wic task before the do_image_cpio task, which creates the u-boot file.
I tried to fix it as follows (from the image recipe):
do_image_wic[depends] = "my-image-recipe:do_image_cpio"
While the dependency graph acknowledges this dependency, BitBake does not seem
to care about it. Whatever I try, do_image_wic is always executed first and,
obviously, does not succeed. I think the problem is comparable to the unsolved
one outlined here:
https://stackoverflow.com/questions/58954170/yocto-creating-a-dependency-for-wic-to-cpio-gz-image
How can I instruct Yocto to execute do_image_cpio first?
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