fix for wlan (cm4)

[virgilhuxley]

2022-10-30
I just installed the latest almalinux on my raspberry pi cm4 using:
89773106f23407efb5258d7185d2005c6ed4f98f2ad23916948be573eb2efb95 AlmaLinux-8-RaspberryPi-latest.aarch64.raw.xz

Everything was seamless except for wifi.

There was no wifi driver file for a pi CM4 in /lib/firmware/brcm

I found a post by @geerlingguy in openwrt forums with the solution.

# cp /lib/firmware/brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.txt /lib/firmware/brcm/brcmfmac43455-sdio.raspberrypi,4-compute-module.txt

running the above command and rebooting resolved my issue.

It would seem that openwrt has implemented something similar into their upstream