Hi guys
We’re a startup building on the Radxa CM3 (RK3566 SoC) with CYW43455 WiFi-BT module. We need to complete EU RED/CE certification, but WiFi config issues are blocking us.
Setup:
-
CM3 RK3566, CYW43455 (AW-CM256SM)
-
Custom Linux kernel 5.10.160-36-rk356x (ARM64)
-
brcmfmac driver, firmware 7.45.251 (/lib/firmware/cypress/cyfmac43455-sdio.bin)
-
wl tool (ARM64) works for dynamic settings like ‘wl country CH’
Issues:
-
Fallback to generic NVRAM (cypress/cyfmac43455-sdio.txt), causing reg domain 00 (world), limited channels (no 12/13 on 2.4GHz, no DFS), no VHT (802.11ac throughput loss), BT coexistence off, antennas show “TX 0 RX 0”.
-
Settings like ieee80211_regdom=CH don’t persist; conflicts with ETSI EN 300 328 for certification.
Requests:
-
Board-specific NVRAM for CM3 (e.g., brcmfmac43455-sdio.radxa-cm3.txt) with EU/CH support (full channels, DFS, VHT, btc_mode=1, antenna config)?
-
Updated WiFi certification guide for CM3?