I managed this issue redefining this script in my custom layer (rocko branch):
scripts/lib/wic/canned-wks/mkefidisk.wks and setting a bigger size for the root partition (80GB in my case): part / --source rootfs --ondisk sda --fstype=ext4 --label platform --align 1024 --use-uuid --*size 80000* Its not very nice, I know. But yocto can't know the real size of your root device until writing the final image. I don't know if this is the best way to fix this but it works. -- Ivan
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