The instructions don't say where to clone it from. However, I looked at https://github.com/sbabic and found 2 repos: swupdate and meta-swupdate. I'm guessing meta-swupdate is the one that I need. Is this correct?
ERROR: Function failed: do_compile (log file is located at /home/alain/var-dart-6ul-yocto-jethro/build-fb/tmp/work/imx6ul_var_dart-poky-linux-gnueabi/u-boot-fw-utils/v2015.07+gitAUTOINC+33711bdd4a-r0/temp/log.do_compile.10525)
ERROR: Logfile of failure stored in: /home/alain/var-dart-6ul-yocto-jethro/build-fb/tmp/work/imx6ul_var_dart-poky-linux-gnueabi/u-boot-fw-utils/v2015.07+gitAUTOINC+33711bdd4a-r0/temp/log.do_compile.10525
| ERROR: Function failed: do_compile (log file is located at /home/alain/var-dart-6ul-yocto-jethro/build-fb/tmp/work/imx6ul_var_dart-poky-linux-gnueabi/u-boot-fw-utils/v2015.07+gitAUTOINC+33711bdd4a-r0/temp/log.do_compile.10525)
ERROR: Task 989 (/home/alain/var-dart-6ul-yocto-jethro/sources/poky/meta/recipes-bsp/u-boot/u-boot-fw-utils_2015.07.bb, do_compile) failed with exit code '1'
NOTE: Tasks Summary: Attempted 1691 tasks of which 1690 didn't need to be rerun and 1 failed.
Stefano correctly pointed out that u-boot-fw-utils is broken from the vendor, Variscite. He suggested: "If you want just check it, you can drop u-boot-fw-utils from DEPENDS in
swupdate.git, and drop the U-Boot's handler in SWUpdate's defconfig."
ERROR: Function failed: do_compile (log file is located at /home/alain/var-dart-6ul-yocto-jethro/build-fb/tmp/work/cortexa7hf-vfp-neon-poky-linux-gnueabi/swupdate/git-r0/temp/log.do_compile.10800)
ERROR: Logfile of failure stored in: /home/alain/var-dart-6ul-yocto-jethro/build-fb/tmp/work/cortexa7hf-vfp-neon-poky-linux-gnueabi/swupdate/git-r0/temp/log.do_compile.10800
| ERROR: Function failed: do_compile (log file is located at /home/alain/var-dart-6ul-yocto-jethro/build-fb/tmp/work/cortexa7hf-vfp-neon-poky-linux-gnueabi/swupdate/git-r0/temp/log.do_compile.10800)
ERROR: Task 270 (/home/alain/var-dart-6ul-yocto-jethro/sources/meta-swupdate/recipes-support/swupdate/swupdate_git.bb, do_compile) failed with exit code '1'
NOTE: Tasks Summary: Attempted 1687 tasks of which 1686 didn't need to be rerun and 1 failed.