Hello, I’m working to build a Yocto Mender image for Beaglebone Black using U-Boot. Things seem to be working well but I’m puzzled by this warning I see during builds of u-boot:
WARNING: u-boot-1_2019.01-r0 do_provide_mender_defines: Found more than one dtb specified in KERNEL_DEVICETREE. Only one should be specified. Choosing the last one.
This warning does not occur when following the official integration directions, but when I change it to use u-boot instead of grub, I see the warning occur.
The only change I made was to add these two lines to my local.conf as instructed to in the Mender docs. MENDER_FEATURES_ENABLE_append = " mender-uboot mender-image-sd" MENDER_FEATURES_DISABLE_append = " mender-grub mender-image-uefi"
I observed that the file sources/poky/meta-yocto-bsp/conf/machine/beaglebone-yocto.conf sets KERNEL_DEVICETREE to "am335x-bone.dtb am335x-boneblack.dtb am335x-bonegreen.dtb", and I am using Beaglebone Black, so the “choosing the last one” is not correct. However, everything seems to be working correctly and my patches to am335x-boneblack.dtb are being applied and show up when I install the new system image, so I’m not exactly sure if this warning is worth investigating.
Excellent, thanks for the info. Sounds like that might be a good introductory task for my first contribution back to the project
I tried to set KERNEL_DEVICETREE = "am335x-boneblack.dtb" in my local.conf but it didn’t seem to take. Presumably it can’t override the setting made in the machine conf?
You can also use MENDER_DTB_NAME_FORCE, which forces the one you want, regardless of what is in KERNEL_DEVICETREE. Doing it this way will still install all of the unneeded DTB files. It only changes which one will be used.
Thanks much! I added MENDER_DTB_NAME_FORCE = "am335x-boneblack.dtb"to my local.conf and that silenced the “Found more than one dtb specified in KERNEL_DEVICETREE” warning, but now observe this new warning:
WARNING: "MENDER_DTB_NAME_FORCE" is not a recognized MENDER_ variable. Typo?
That warning seems to arise because MENDER_DTB_NAME_FORCE is not in the list in meta-mender/meta-mender-core/conf/mender-vars.json. Should it be added there? I can make a PR. Or should I just ignore this warning? Thanks!
