Try to support RPI4

root/package/firmware/brcmfmac-board-rpi/patches/sync-nvram-configuration-brcmfmac43455.patch

@@ -0,0 +1,25 @@
+From ca8a6a85b4753a386f519b8b2d8436f34badc543 Mon Sep 17 00:00:00 2001
+From: Andrei Gherzan <andrei@gherzan.ro>
+Date: Wed, 3 Jul 2019 16:15:21 +0100
+Subject: [PATCH] brcmfmac43455-sdio.txt: Sync NVRAM configuration Raspbian
+
+Fixes: https://github.com/RPi-Distro/firmware-nonfree/issues/3
+
+Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
+---
+ brcm/brcmfmac43455-sdio.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/brcm/brcmfmac43455-sdio.txt b/brcm/brcmfmac43455-sdio.txt
+index 54d9321..6801286 100644
+--- a/brcm/brcmfmac43455-sdio.txt
++++ b/brcm/brcmfmac43455-sdio.txt
+@@ -21,7 +21,7 @@ btc_mode=1
+ #            bit1 for btcoex
+ boardflags=0x00480201
+ boardflags2=0x40800000
+-boardflags3=0x48200100
++boardflags3=0x44200100
+ phycal_tempdelta=15
+ rxchain=1
+ txchain=1