Raspberry Pi family: read motd board name from /proc/cpuinfo

- also adjust hostname if they are Armbian defaults
- drop rpi5b build config as they all run with one image

packages/bsp/common/etc/update-motd.d/10-armbian-header

@@ -92,6 +92,11 @@ fi
 # Display software vendor logo
 echo -e "\e[1;91m$(figlet -f small " $VENDOR")\e[0m";
 
+# Read RPI model from cpuinfo
+if [[ $BOARD == rpi4b ]]; then
+BOARD_NAME=$(grep "Model" /proc/cpuinfo | sed -E 's/^Rev //; s/ Rev [0-9.]+$//' | cut -d":" -f2 | xargs)
+fi
+
 # Display version, board, and kernel version
 [[ $VERSION == *trunk* ]] && VERSION=$(echo -e $VERSION | cut -d"." -f1-2 | sed "s/\$/ rolling/")
 echo -e " \e[0;92mv${VERSION}\x1B[0m for $BOARD_NAME running Armbian Linux \e[0;92m${KERNELID^}\x1B[0m"

packages/bsp/common/usr/lib/armbian/armbian-firstrun

@@ -109,6 +109,19 @@ case "$1" in
 	[[ "${LINUXFAMILY}" == meson64 ]] && set_fixed_mac
 	[[ "${BOARD}" == nanopi-r6* ]] && set_fixed_mac
 
+	# adjust hostname for rpi's
+	if [[ "${BOARD}" == rpi4b && "$(cat /etc/hostname)" == rpi4b ]]; then
+		BOARD_NAME=$(grep "Model" /proc/cpuinfo | sed -E 's/^Rev //; s/ Rev [0-9.]+$//' | cut -d":" -f2 | xargs)
+		[[ "$BOARD_NAME" == *"Zero 2 W"* ]] && NEW_HOSTNAME="rpizero2w"
+		[[ "$BOARD_NAME" == *"Pi 5 Model B"* ]] && NEW_HOSTNAME="rpi5b"
+		[[ "$BOARD_NAME" == *"Pi 3 Model B"* ]] && NEW_HOSTNAME="rpi3b"
+		[[ "$BOARD_NAME" == *"Pi 400"* ]] && NEW_HOSTNAME="rpi400"
+		# Update /etc/hosts to reflect the new hostname
+		sed -i "s/$(hostname)/$NEW_HOSTNAME/g" /etc/hosts
+		# Change the hostname
+		hostnamectl set-hostname "$NEW_HOSTNAME"
+	fi
+
 	# Remove KDE Neon base files upgrade pin
 	[[ -f /etc/apt/preferences.d/99-neon-base-files ]] && rm -f /etc/apt/preferences.d/99-neon-base-files