I’m trying to diagnose some Wi-Fi instability on an embedded device running Armbian and using an AP6212 (BCM43430) Wi-Fi module.
The system frequently throws kernel errors related to brcmfmac and eventually Wi-Fi stops functioning correctly.
Kernel log examples:
[Fri Mar 6 08:24:35 2026] ieee80211 phy0: brcmf_cfg80211_scan: scan error (-110)
[Fri Mar 6 08:24:58 2026] ieee80211 phy0: brcmf_cfg80211_start_ap: Beacon Interval Set Error, -110
[Fri Mar 6 08:25:16 2026] ieee80211 phy0: brcmf_cfg80211_get_channel: chanspec failed (-110)
[Fri Mar 6 08:25:19 2026] ieee80211 phy0: brcmf_cfg80211_get_tx_power: error (-110)
[Fri Mar 6 08:25:27 2026] ieee80211 phy0: brcmf_cfg80211_change_iface: WLC_SET_INFRA error (-110)
[Fri Mar 6 08:26:13 2026] ieee80211 phy0: brcmf_run_escan: error (-110)
Additionally, wpa_supplicant logs occasionally show:
nl80211: kernel reports: key addition failed
I also see the interface flapping:
systemd-networkd: wlan0: Gained carrier
systemd-networkd: wlan0: Lost carrier
System details:
Board: Radxa ROCK S0
OS: Armbian (6.18.8-current-rockchip64)
Wi-Fi chip: AP6212 (Broadcom BCM43430)
Driver: brcmfmac
Manager: NetworkManager
Things I have already checked:
- Only NetworkManager managing the interface (not systemd-networkd)
- Fixed Wi-Fi channel
- Disabled Wi-Fi power saving
- Bluetooth disabled
- Tested increasing CPU max frequency with:
The AP usually functions for for about 4 hours, then the firmware for the chip locks up. I can see the AP being broadcast but cannot connect to it.
Any guidance or debugging suggestions would be greatly appreciated.