Firmware for use with kms drivers.
These firmware modules are for use with the FreeBSD kms drm drivers. They are originally obtained from the linux-firmware repository, located here: https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
The uuencoded formware files are located in amdgpukmsfw-files, i915kmsfw-files and radeonkmsfw-files directories, for respective driver. The directories with the same names, but without -files, contain Makefiles for building firmware kmods for loading into the FreeBSD kernel.
Download the firmware from the git repo above, and then uuencode the firmware.