* build-aux/hydra/gnu-system.scm (%u-boot-systems): New variable. (%guixsd-supported-systems): Add armhf-linux. (qemu-jobs): Use u-boot if system in %u-boot-systems.
* build-aux/hydra/gnu-system.scm (%u-boot-systems): New variable. (%guixsd-supported-systems): Add armhf-linux. (qemu-jobs): Use u-boot if system in %u-boot-systems.