In Arch Linux
mkinitcpio -p linux
shows
Possibly missing firmware for module: aic94xx
Possibly missing firmware for module: wd719x
git clone https://aur.archlinux.org/aic94xx-firmware.git
cd aic94xx-firmware
makepkg -sri
git clone https://aur.archlinux.org/wd719x-firmware.git
cd wd719x-firmware
makepkg -sri
and then mkinitcpio -p linux
again.
I have explained my point of view in above comments, but since I had a message about my vulgar (sic) ways, peeps with OCD issues can now relax.
mkinitcpio-firmware mentioned above installs the unnecessary firmware needed only by mkinitcpio to suppress the warnings.
Sorry, but I won't be commenting any more about it.