Not getting any wireless

[jgauthier]

Greetings,

 

    I've built a custom image for the BPI M4 Zero and have been using a wired USB cable for my config and development work,    It's final destination will require wireless. So I started to configure that today and discovered that it does not find any wireless access points.

 

The device exists.

 

3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether ac:6a:a3:3f:9c:65 brd ff:ff:ff:ff:ff:ff

 

There is an overlay loaded (I did not add it, it was part of the image build)

overlays=bananapi-m4-sdio-wifi-bt usbhost bananapi-m4-pi-5-6-i2c0 bananapi-m4-pi-7-8-i2c1

 

I do not see any errors from dmesg, but only these:

[    8.484857] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[    8.851537] brcmfmac: brcmf_c_process_txcap_blob: no txcap_blob available (err=-2)
[    8.852261] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Aug 29 2023 01:47:08 version 7.45.265 (28bca26 CY) FWID 01-b677b91b

 

I am not sure where to begin diagnosing this. I almost never use wireless on Linux so I could be overlooking something basic.

 

# iwlist wlan0 scanning
wlan0     No scan results

 

 

# uname -a
Linux bananapim4zero 6.13.11-edge-sunxi64 #5 SMP PREEMPT_RT Thu Apr 10 12:42:07 UTC 2025 aarch64 GNU/Linux