skiboot-5.4.9 was released on Friday January 5th, 2018. It replaces skiboot-5.4.8 as the current stable release in the 5.4.x series.
Over skiboot-5.4.8, we have one new feature:
Parse IPL FW feature settings
Add parsing for the firmware feature flags in the HDAT. This indicates the settings of various parameters which are set at IPL time by firmware.