Hi Peter,
there is no need to ship u-boot in core182. This patch https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=ba1457912e82c80dd4ff59d2... only remove an extra pass that was needed to build the kernel early in the build process which was moved to the end. The final u-boot binaries are the same.
Arne