On 3/14/21 6:16 PM, p32 via lists.yoctoproject.org wrote:
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?
You might try splitting it up with two images; one that makes your CPIO
and one that makes the wic image. Since the wic image (presumably?)
doesn't even have the rootfs specified, it probably doesn't even matter
what the image is (e.g. you could use core-image-minimal as a test, or
try to make some even slimmer empty image).
I think by doing that you could do something like:
IMAGE_BOOT_FILES += "my-cpio-image.cpio.xz.u-boot"
IMAGE_FILE_DEPENDS += "my-cpio-image"
Then:
bitbake core-image-minimal
Would sort of do what you are asking
I think they key is that you need a "root file system image" that is
*not* your CPIO because wic expects to be tied to one that it can write
to the .wic image, even if thats not actually what you are doing.
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