BSDForums.org says, Sam Leffler and Florent Thoumie have been working on some generic support for loading firmware using kld’s. Firmware is packaged using a genfw program. One can package one or more firmware images in a single kld.
KLD refers to Dynamic Kernel Linker Facility – the kld interface allows system administrators to dynamically add and remove functionality from a running system. This allows device driver writers to load their new changes into a running kernel without constantly rebooting to test changes. Read more.