硬件平台
MT7628A+128RAM+16FLASH
openwrt版本：19.07
一，修改内核USB驱动
/build_dir/target-mipsel_24kc_musl/linux-ramips_mt76x8/linux-4.14.180/drivers/usb/serial/option.c
找到 LONGCHEER_VENDOR_ID 添加新的产品ID: #define LONGSHANG_U9300_PRODUCT_ID 0x9b3c
#define LONGCHEER_VENDOR_ID 0x1c9e
/* 4G Systems products */
/* This is the 4G XS Stick W14 a.k.a. Mobilcom Debitel Surf-Stick *
* It seems to contain a Qualcomm QSC6240/6290 chipset */
#define FOUR_G_SYSTEMS_PRODUCT_W14 0x9603
#define FOUR_G_SYSTEMS_PRODUCT_W100 0x9b01
/* Fujisoft products */
#define FUJISOFT_PRODUCT_FS040U 0x9b02
/* iBall 3.5G connect wireless modem */
#define IBALL_3_5G_CONNECT 0x9605
/* Zoom */
#define ZOOM_PRODUCT_4597 0x9607
/* SpeedUp SU9800 usb 3g modem */
#define SPEEDUP_PRODUCT_SU9800 0x9800
/*U9300*/
#define LONGSHANG_U9300_PRODUCT_ID 0x9b3c
添加该id到数组
{ USB_DEVICE_INTERFACE_CLASS(LONGCHEER_VENDOR_ID, SPEEDUP_PRODUCT_SU9800, 0xff) },
{ USB_DEVICE_INTERFACE_CLASS(LONGCHEER_VENDOR_ID, LONGSHANG_U9300_PRODUCT_ID, 0xff),
.driver_info = RSVD(4) },
{ USB_DEVICE_INTERFACE_CLASS(LONGCHEER_VENDOR_ID, 0x9801, 0xff),
配置menuconfig,kernel modules->USB Support->kmod-usb-serila->option编译后即可识别正确识别模块，识别到4个USBtty(0-3)
二，编译龙尚gobinet驱动
将官方驱动解压到package/gobinet/src/目录(新建目录)，在package/gobinet目录下新建makefile，内容如下：
include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=gobinet
PKG_RELEASE:=1
include $(INCLUDE_DIR)/package.mk
define KernelPackage/gobinet
SUBMENU:=Other modules
TITLE:=Support Module for gobinet
DEPENDS:=+kmod-usb-core +kmod-usb-net
FILES:=$(PKG_BUILD_DIR)/GobiNet.ko
AUTOLOAD:=$(call AutoLoad,81,GobiNet)
endef
define KernelPackage/gobinet/description
This is a gobinet drivers
endef
MAKE_OPTS:=ARCH="$(LINUX_KARCH)" \
CROSS_COMPILE="$(TARGET_CROSS)" \
SUBDIRS="$(PKG_BUILD_DIR)"
define Build/Prepare
mkdir -p $(PKG_BUILD_DIR)/
$(CP) -R ./src/* $(PKG_BUILD_DIR)/
endef
define Build/Compile
$(MAKE) -C "$(LINUX_DIR)" $(MAKE_OPTS) modules
endef
$(eval $(call KernelPackage,gobinet))
在menuconfig 中将该驱动编译进内核kernel modules->Other modules->kmod-gobinet
编译刷机后查看是否出现新的网卡eth0或者eth1
三，查看模块状态，拨号上网(安装minicom，选择USBtty2)
查询APN
AT+CGDCONT?
配置APN
AT+CGDCONT=1,"IP","CTNET"
CTNET(电信)
CMNET(移动)
3GNET（联通）
APN一般模块可以自动识别，无需配置
拨号上网
AT$QCRMCALL=1,1
加入开机启动rc.local，注意文件需要可执行权限
echo -e "at\$qcrmcall=1,1\r\n" >/dev/ttyUSB2 | cat /dev/ttyUSB2
添加新的wan接口
登录web页面，network->interfaces，点击add new interfaces ，任意起个名字，DHCP CLIENT,interface选择新的网口eth*，firewall 加入wan，刷新后看是否能够自动获取ip,获取ip成功即可联网！
