WARNING: Unable to get checksum for barebox SRC_URI entry defconfig: file could not be found
The right fix for this is to move barebox recipe to oe-core as it has nothing to do with the BSP.
Fixed in change: http://git.yoctoproject.org/cgit/cgit.cgi/meta-fsl-arm/commit/?id=1a90a83bcdb5a54e037c7f72c30e698833f3508b