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.
This is a 2016 thread explaining that installing missing firmwares may make the warnings go away, but that doesn't make those firmwares work unless the related hardware is present.
Quote:
"You appear to have ignored all the advise offered in this thread up to this point.
The modules will not be loaded if the relevant hardware if not present on the system, presence or absence or the firmware will not change this."
https://bbs.archlinux.org/viewtopic.php?id=221076