Tak z Widlí jsem vyčetl, že by to mělo být Broadcom BCM43241 rev 4+ což je obsaženo ve firmware brcm/brcmfmac43241b4-sdio.bin. Mrknu se jestli to tam sedí v systému /lib/firmware/brcm.
No ale to vypadá, že zrovna to je ten případ, kdy to potřebuje ty další informace z NVRAM ;-). Viz "NVRAM from EFI" sekce v té odkazované stránce:
Some new devices are storing the nvram which is needed in addition to the firmware by the driver in an EFI variable and the Windows driver can access it. Currently brcmfmac does not support this automatically. First mount the efi vars into sysfs:
mount -t efivarfs none /sys/firmware/efi/efivars
The content of the nvram is in this file:
/sys/firmware/efi/efivars/nvram-74b00bd9-805a-4d61-b51f-43268123d113
Copy this file where brcmfmac expects the nvram, for example:
cat /sys/firmware/efi/efivars/nvram-74b00bd9-805a-4d61-b51f-43268123d113 > /lib/firmware/brcm/brcmfmac43241b4-sdio.txt