rk3288_android_7.1串口权限设置

路径：rk3288_android_7.1\device\rockchip\rk3288

#write/sys/bus/platform/drivers/usb20_otg/force_usb_mode 1
#1 HOST  2 OTG

#start eGTouchD
chmod 0666 /dev/ttyS1
chown system system /dev/ttyS1
chmod 0666 /dev/ttyS3
chown system system /dev/ttyS3
chmod 0666 /dev/ttyS4
chown system system /dev/ttyS4