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.
mkinitcpio-firmware
Optional firmware for the default linux kernel to get rid of the annoying 'WARNING: Possibly missing firmware for module:' messages
https://aur.archlinux.org/packages/mkinitcpio-firmware/