[add] add service to load kernel modules at boot

board/m5stack/coremp135/linux-enable-m5stack.config

@@ -19,4 +19,6 @@ CONFIG_LOGO_LINUX_MONO=y
 CONFIG_LOGO_LINUX_VGA16=y
 CONFIG_LOGO_LINUX_CLUT224=y
 CONFIG_FONT_SUPPORT=y
-CONFIG_FONT_8x8=y
+CONFIG_FONT_8x8=y
+
+CONFIG_USB_G_SERIAL=m

board/m5stack/coremp135_5_15/linux-enable-m5stack.config

@@ -19,4 +19,6 @@ CONFIG_LOGO_LINUX_MONO=y
 CONFIG_LOGO_LINUX_VGA16=y
 CONFIG_LOGO_LINUX_CLUT224=y
 CONFIG_FONT_SUPPORT=y
-CONFIG_FONT_8x8=y
+CONFIG_FONT_8x8=y
+
+CONFIG_USB_G_SERIAL=m

board/m5stack/overlay/etc/init.d/S01module

@@ -1,37 +0,0 @@
-#!/bin/sh
-
-start() {
-	/sbin/modprobe soundcore
-	/sbin/modprobe snd
-	/sbin/modprobe snd_timer
-	/sbin/modprobe snd_pcm
-	/sbin/modprobe snd_pcm_dmaengine
-	/sbin/modprobe snd_soc_core
-	/sbin/modprobe out_to_pins
-	/sbin/modprobe snd_soc_simple_card_utils
-	/sbin/modprobe snd_soc_audio_graph_card
-	/sbin/modprobe snd_soc_stm32_sai
-	/sbin/modprobe snd_soc_stm32_sai_sub
-	/sbin/modprobe cdc-acm
-}
-
-stop() {
-	echo "yes" > /dev/null
-}
-
-restart() {
-	stop
-	sleep 1
-	start
-}
-
-case "$1" in
-	start|stop|restart)
-		"$1";;
-	reload)
-		# Restart, since there is no true "reload" feature.
-		restart;;
-	*)
-		echo "Usage: $0 {start|stop|restart|reload}"
-		exit 1
-esac

board/m5stack/overlay/etc/init.d/S02modules

@@ -0,0 +1,58 @@
+#!/bin/sh
+
+MODULES="modules"
+
+load_unload() {
+	[ ! -f /etc/${MODULES} ] && echo ' OK' && exit 0
+
+	while read module args; do
+
+		case "$module" in
+			""|"#"*) continue ;;
+		esac
+
+		if [ "$1" = "load" ]; then
+			/sbin/modprobe -q ${module} ${args} >/dev/null && \
+				printf ' %s success,' "$module" ||
+				printf ' %s failed,' "$module"
+		else
+			rmmod ${module} >/dev/null
+		fi
+
+	done < /etc/${MODULES}
+}
+
+start() {
+	printf 'Starting %s:' "$MODULES"
+
+	load_unload load
+
+	echo ' OK'
+}
+
+stop() {
+	printf 'Stopping %s: ' "$MODULES"
+
+	load_unload unload
+
+	echo 'OK'
+}
+
+restart() {
+	stop
+	sleep 1
+	start
+}
+
+case "$1" in
+	start|stop|restart)
+		"$1";;
+	reload)
+		# Restart, since there is no true "reload" feature.
+		restart;;
+	*)
+		echo "Usage: $0 {start|stop|restart|reload}"
+		exit 1
+esac
+
+exit $?

board/m5stack/overlay/etc/modules

@@ -0,0 +1,18 @@
+# /etc/modules: kernel modules to load at boot time.
+#
+# This file contains the names of kernel modules that should be loaded
+# at boot time, one per line. Lines beginning with "#" are ignored.
+soundcore
+snd
+snd_timer
+snd_pcm
+snd_pcm_dmaengine
+snd_soc_core
+out_to_pins
+snd_soc_simple_card_utils
+snd_soc_audio_graph_card
+snd_soc_stm32_sai
+snd_soc_stm32_sai_sub
+cdc-acm
+libcomposite
+g_serial