fix(rpi4): fix WiFi stability issues caused by HDMI interference

project/yocto/build/conf/multiconfig/raspberrypi4-64.conf

@@ -15,6 +15,12 @@ RPI_EXTRA_CONFIG:append = 'camera_auto_detect=1\n'
 #
 RPI_EXTRA_CONFIG:append = 'gpu_mem=512\n'
 
+#
+# Prevent HDMI signals from interfering WiFi signal.
+# Otherwise, the Raspberry Pi 4 WiFi will become unstable with dmesg error message "ieee80211 phy0: brcmf_cfg80211_scan: Connecting: status (3)".
+# See https://forums.raspberrypi.com/viewtopic.php?t=254640#p1564389
+RPI_EXTRA_CONFIG:append = 'config_hdmi_boost=4\n'
+
 #
 # Required to build linux-firmware-rpidistro, but may carry a legal risk. See
 #   - https://meta-raspberrypi.readthedocs.io/en/latest/ipcompliance.html