update scripts and documentation

FAQ.md

@@ -41,6 +41,9 @@ Here is a link regarding Debian and Secure Boot:
 
 https://wiki.debian.org/SecureBoot
 
+There is work underway to add Secure Boot support for systems that do not
+have `dkms` available or if a manual installation is desired.
+
 If you are using a basic command line (non-dkms) installation, see the
 following section in the Installation Steps part of the README:
 
@@ -192,3 +195,31 @@ dtoverlay=disable-wifi
 ```
 
 -----
+
+Question: When running `sudo sh install-driver.sh` on my RasPi 4B or
+400, I see the following:
+
+```
+Your kernel header files aren't properly installed.
+Please consult your distro documentation or user support forums.
+Once the header files are properly installed, please run...
+```
+
+Answer: The Pi 4/400 firmware now prefers the 64-bit kernel if one
+exists so even if you installed the 32 bit version of the RasPiOS,
+you may now have the 64 bit kernel active.
+
+The fix:
+
+add the following to /boot/config.txt and reboot:
+
+arm_64bit=0
+
+Reference:
+
+https://forums.raspberrypi.com/viewtopic.php?p=2091532&hilit=Tp+link#p2091532
+
+Note to RasPiOS devs: We really really wish you would consider the 
+consequences of the changes you make. Thank you.
+
+-----

Kconfig

@@ -1,7 +1,6 @@
 config RTL8821AU
 	tristate "Realtek 8821A USB WiFi"
 	depends on USB
-	select WIRELESS_EXT
 	help
 	  Help message of RTL8821AU
 

Makefile

@@ -32,6 +32,9 @@ EXTRA_CFLAGS += -DCONFIG_LED_ENABLE
 EXTRA_CFLAGS += -Wno-address
 EXTRA_CFLAGS += -Wframe-larger-than=1648
 
+# gcc-13
+EXTRA_CFLAGS += -Wno-enum-int-mismatch
+
 GCC_VER_49 := $(shell echo `$(CC) -dumpversion | cut -f1-2 -d.` \>= 4.9 | bc )
 ifeq ($(GCC_VER_49),1)
 EXTRA_CFLAGS += -Wno-date-time	# Fix compile error && warning on gcc 4.9 and later
@@ -1352,20 +1355,8 @@ ifeq ($(CONFIG_PLATFORM_AUTODETECT), y)
 EXTRA_CFLAGS += -DCONFIG_LITTLE_ENDIAN
 EXTRA_CFLAGS += -DCONFIG_IOCTL_CFG80211 -DRTW_USE_CFG80211_STA_EVENT
 
-SUBARCH := $(shell uname -m)
-
-ifeq ($(SUBARCH), aarch64)
-SUBARCH := arm64
-endif
-
-ifeq ($(SUBARCH), armv7l)
-SUBARCH := arm
-endif
-
-ifeq ($(SUBARCH), armv6l)
-SUBARCH := arm
-endif
-
+#SUBARCH := $(shell uname -m)
+SUBARCH := $(shell uname -m | sed -e "s/i.86/i386/; s/ppc/powerpc/; s/armv.l/arm/; s/aarch64/arm64/; s/riscv.*/riscv/;")
 ARCH ?= $(SUBARCH)
 
 CROSS_COMPILE ?=
@@ -2516,7 +2507,8 @@ sign:
 	@mokutil --import MOK.der
 	@$(KSRC)/scripts/sign-file sha256 MOK.priv MOK.der 8821au.ko
 
-sign-install: all sign install
+sign-install:
+	sign install
 
 backup_rtlwifi:
 	@echo "Making backup rtlwifi drivers"
@@ -2573,4 +2565,5 @@ clean:
 	rm -fr Module.symvers ; rm -fr Module.markers ; rm -fr modules.order
 	rm -fr *.mod.c *.mod *.o .*.cmd *.ko *~
 	rm -fr .tmp_versions
+	rm -fr MOK.der MOK.priv
 endif