I am running a custom buildroot + uboot software with a 5.15.78-v8 linux kernel for a Raspberry Pi CM4 and am finding that the Wi-Fi driver by default isn't being loaded.
In dmesg, I am seeing these errors that look related to the driver not being loaded:
[21.2122] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43455-sdio.raspberrypi,4-compute-module.bin failed with error -2
[21.2123] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43455-sdio.txt failed with error -2
[21.2124] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50
modinfo also shows no usage of the brcmfmac module. and
ifconfig -a doesn't show the wlan0 interface.
Does anyone know why my driver may not be loading correctly and timing out instead? Cheers