There is no firmware at all on the ath9k wifi chipsets. The firmware in the HDD/SSD is the same issue on all computers, not just libreboot. The graphics chip doesn't contain any firmware, instead the "video bios" is included in the SPI chip alongside coreboot or libreboot. In the case of libreboot, all current targets have free Video BIOS implementations, referred to in coreboot as "native graphics initialization".