The latest 550x/570x BIOS releases change the RMC fingerprints. Update the board fingerprints for at least version 1D1 BIOS.
The link to Joule BIOS downloads: https://downloadcenter.intel.com/search?keyword=joule+bios
Fingerprints were upgraded to latest available firmware - rev. 1F1. Joule was split from generic Broxton-M - their BIOS strings are different. Patches sent to mailing list. https://lists.yoctoproject.org/pipermail/meta-intel/2017-June/004761.html https://lists.yoctoproject.org/pipermail/meta-intel/2017-June/004762.html