It's difficult to guess which drivers are free are which are nonfree, ALARM is like Arch x86, so to know which drivers are nonfree or libre, you could visit
https://h-node.org/And if you want to know which specific wifi cards work with FLOSS, you can take a look here
https://wiki.parabola.nu/WiFi_devices_k ... inux-librethat's a fully free version of the Arch Linux and ALARM distros, so what works there, works
only and exclusively with free and open source software.
I hope I've helped you
EDIT: Parabola's version for ARM is only for ARMv7, but it shouldn't affect since v7 is 32 bits and v8 is 64 bits, so they are compatible, like i686 with x64