add (duo256m config):support SPINAND image compilation on IOB board

device/milkv-duo256m-spinand/boardconfig.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+export MV_BOARD=milkv-duo256m-spinand
+export MV_BOARD_CPU=cv1812cp
+export MV_VENDOR=milkv
+export MV_BUILD_ENV=milkvsetup.sh
+export MV_BOARD_LINK=cv1812cp_milkv_duo256m_spinand
+

device/milkv-duo256m-spinand/overlay/mnt/system/blink.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+LED_PIN=354
+
+LED_GPIO=/sys/class/gpio/gpio${LED_PIN}
+
+if test -d ${LED_GPIO}; then
+    echo "PIN ${LED_PIN} already exported"
+else
+    echo ${LED_PIN} > /sys/class/gpio/export
+fi
+
+echo out > ${LED_GPIO}/direction
+
+while true; do
+    echo 0 > ${LED_GPIO}/value
+    sleep 0.5
+    echo 1 > ${LED_GPIO}/value
+    sleep 0.5
+done
+

device/milkv-duo256m-spinand/overlay/mnt/system/duo-init.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# Set Pin-29(GP22) to GPIO
+devmem 0x0502707c 32 0x111
+devmem 0x03001068 32 0x3
+
+# Set Pin-19(GP14) to GPIO
+duo-pinmux -w GP14/GP14 > /dev/null
+
+# Insmod PWM Module
+insmod /mnt/system/ko/cv181x_pwm.ko
+

device/milkv-duo256m-spinand/overlay/mnt/system/usb-host.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+echo host > /proc/cviusb/otg_role >> /tmp/usb.log 2>&1
+

device/milkv-duo256m-spinand/overlay/mnt/system/usb-rndis.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+/etc/uhubon.sh device >> /tmp/rndis.log 2>&1
+/etc/run_usb.sh probe rndis >> /tmp/rndis.log 2>&1
+/etc/run_usb.sh start rndis >> /tmp/rndis.log 2>&1
+
+sleep 0.5
+ifconfig usb0 192.168.42.1
+
+count=`ps | grep dnsmasq | grep -v grep | wc -l`
+if [ ${count} -lt 1 ] ;then
+  echo "/etc/init.d/S80dnsmasq start" >> /tmp/rndis.log 2>&1
+  /etc/init.d/S80dnsmasq start >> /tmp/rndis.log 2>&1
+fi

device/milkv-duo256m-spinand/overlay/mnt/system/usb.sh

@@ -0,0 +1 @@
+usb-host.sh