diff --git a/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S00kmod b/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S00kmod
index 08c9725dc..4c5ff6840 100755
--- a/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S00kmod
+++ b/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S00kmod
@@ -7,8 +7,8 @@ then
 	cd /mnt/system/ko/
 	insmod soph_sys.ko
 	insmod soph_base.ko
-	insmod soph_rtos_cmdqu.ko
-	insmod soph_fast_image.ko
+	insmod soph_rtos_cmdqu.ko # optional for RTOS core
+	insmod soph_fast_image.ko # optional for RTOS core
 	insmod soph_mipi_rx.ko
 	insmod soph_snsr_i2c.ko
 	insmod soph_vi.ko
diff --git a/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S00pmu b/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S00pmu
index 3a497c32d..e892e54a8 100755
--- a/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S00pmu
+++ b/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S00pmu
@@ -1,48 +1,62 @@
 #!/bin/sh
 
+PMU_BUS=4
+PMU_ADDR=0x34
+PMU_REG_VER=0x03
+
+pmu_detected() {
+    pmu_version=$(i2cget -y "$PMU_BUS" "$PMU_ADDR" "$PMU_REG_VER" 2>/dev/null)
+    if [ $? -ne 0 ]; then
+        return 1
+    fi
+
+    pmu_version=$((pmu_version & 0xCF))
+    chip_id_1=$((0x47))
+    chip_id_2=$((0x4a))
+
+    if [ "$pmu_version" -eq "$chip_id_1" ] || [ "$pmu_version" -eq "$chip_id_2" ]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
 start() {
-	if ! command -v i2cget &> /dev/null
-	then
-	    echo "i2cdetect not find, please install i2c-tools"
-	    exit 1
-	fi
+    # if ! command -v i2cget &> /dev/null; then
+    #     echo "i2cget not found, please install i2c-tools"
+    #     exit 1
+    # fi
 
-	pmu_version=$(i2cget -y 4 0x34 0x03)
-	pmu_version=$((pmu_version & 0xCF))
-
-	chip_id_1=$(printf "%d" 0x47)
-	chip_id_2=$(printf "%d" 0x4a)
-
-	if [ "$pmu_version" -eq "$chip_id_1" ] || [ "$pmu_version" -eq "$chip_id_2" ]; then
-		exec /usr/bin/axp2101
-		echo "Starting PMU: OK\n"
-	fi
+    if pmu_detected; then
+        exec /usr/bin/axp2101
+    else
+        echo "No PMU, skip"
+    fi
 }
 
 stop() {
-    runlevel=$(cat /run/runlevel | awk '{ print $1 }')
-    if [ "$runlevel" = "0" ]; then
-        printf "Stopping PMU\n"
-        value=$(i2cget -y 4 0x34 0x10)
-        value=$((value | 0x01))
-        i2cset -y 4 0x34 0x10 $value
+    if pmu_detected; then
+        runlevel=$(cat /run/runlevel | awk '{ print $1 }')
+        if [ "$runlevel" = "0" ]; then
+            echo "Stopping PMU"
+            value=$(i2cget -y "$PMU_BUS" "$PMU_ADDR" 0x10)
+            value=$((value | 0x01))
+            i2cset -y "$PMU_BUS" "$PMU_ADDR" 0x10 $value
+        fi
+    else
+        echo "No PMU, skip"
     fi
 }
 
 case "$1" in
     start)
-        if grep -q "pmu=axp2101" /boot/board 2>/dev/null; then
-            start
-        fi
+        start
         ;;
     stop)
-        if grep -q "pmu=axp2101" /boot/board 2>/dev/null; then
-            stop
-        fi
+        stop
         ;;
     *)
-        echo "Usage: /etc/init.d/S00pmu {start}"
+        echo "Usage: $0 {start|stop}"
         exit 1
         ;;
 esac
-
diff --git a/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S05tp b/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S05tp
index bfec20842..5478f5cec 100755
--- a/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S05tp
+++ b/buildroot/board/cvitek/SG200X/overlay/etc/init.d/S05tp
@@ -11,16 +11,16 @@ then
 	then
 		panel_value=$(grep '^panel=' /boot/uEnv.txt | cut -d '=' -f 2)
 	fi
-	if [ "$panel_value" = "st7701_lct024bsi20" ]
+	if [ "$panel_value" = "st7701_lct024bsi20" ] # MaixCAM-Pro
 	then
 		echo "load cst7xx touchscreen driver"
 		insmod /mnt/system/ko/hynitron_touch_new.ko
-	elif [ "$panel_value" = "st7701_hd228001c31" ]
+	elif [ "$panel_value" = "st7701_hd228001c31" ] # MaixCAM
 	then
 		echo "load cst3xx touchscreen driver"
 		insmod /mnt/system/ko/hynitron_touch.ko
 	fi
-	if [ -e /boot/gt9xx ]
+	elif [ "$panel_value" = "mtd700920b" ] # 7-inch touchscreen
 	then
 		echo "load gt9xx touchscreen driver"
 		insmod /mnt/system/ko/3rd/gt9xx.ko