硬體平臺：MT7628A

openwrt版本：MTK_SDK

1、新增模組資訊

/build_dir/target-mipsel_24kc_musl/linux-ramips_mt76x8/linux-4.14.180/drivers/usb/serial/option.c

在原始碼中找到option_ids陣列， 新增模組VID、PID: 0x1c9e、 0x9b3c 

/* 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 LONGSUNG_VENDOR_ID            0x1c9e

#define LONGSUNG_U9300_PRODUCT_ID     0x9b3c 

新增該id到陣列，過濾 interface 4

{ USB_DEVICE_INTERFACE_CLASS(LONGSUNG_VENDOR_ID, SPEEDUP_PRODUCT_SU9800, 0xff) },
{ USB_DEVICE_INTERFACE_CLASS(LONGSUNG_VENDOR_ID, LONGSUNG_U9300_PRODUCT_ID, 0xff),
   .driver_info = RSVD(4) },
{ USB_DEVICE_INTERFACE_CLASS(LONGSUNG_VENDOR_ID, 0x9801, 0xff),

在 /drivers/network/usb/qmiw_wan.c檔案新增 VID

2、編譯

配置make menuconfig：

Base system --> udev
Kernel modules --> USB Support --> kmod-usb-acm kmod-usb-net kmod-usb-net kmod-usb-net kmod-usb-net-qmi-wwan kmod-usb-ohci kmod-usb-serial kmod-usb-serial-option
LuCI ---> Protocols ---> luci-proto-3g luci-proto-qmi
Network ---> uqmi
Utilities ---> usb-modeswitch usbutils

配置make kernel_menuconfig：

device drivers ---> usb support --->usb serial converter support--->USB driver for GSM and CDMA modems
device drivers--->Network device support--->usb Network Adapters--->Multi-purpose USB Networking Framework

修改 ENOMSG值改為42

build_dir/target-mips_34kc_uClibc-0.9.33.2/linux-ar71xx_generic/linux-3.18.84/arch/mips/include/uapi/asm/errno.h

#define ENOMSG 42

編譯後, 新增成功 及 驅動正常 會在 /dev/ 目錄下生成 ttyUSB0 -- ttyUSB4   5個埠

3、編譯龍尚gobinet驅動

將官方驅動解壓到 package/gobinet/src/，在package/gobinet 目錄下新建 makefile 檔案，內容如下：

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 中將該驅動編譯進核心  kernel modules ->   Other modules ->  kmod-gobinet

編譯刷機後檢視是否出現新的網絡卡eth0或者eth1

4、檢視模組狀態，撥號上網(安裝minicom，選擇ttyUSB2)

minicom操作：

查詢APN
AT+CGDCONT?

配置APN
AT+CGDCONT=1,"IP","CTNET"

CTNET(電信)
CMNET(移動)
3GNET（聯通）
APN一般模組可以自動識別，無需配置

撥號上網
AT$QCRMCALL=1,1

加入開機啟動 rc.local，注意檔案需要可執行許可權
echo -e "at\$qcrmcall=1,1\r\n" >/dev/ttyUSB2 | cat /dev/ttyUSB2

修改路由配置檔案vi /etc/config/network

config interface 'wan'
    option  device '/dev/cdc-wdm0'
    option proto 'qmi'
    option apn  'cnnet'
    option username 'card'
    option password 'card'
    option ifname 'wwan0'

WEB頁面新增新的wan介面：

登入web頁面，network ->  interfaces，點選 add new interfaces ，任意起個名字，DHCP CLIENT,  interface選擇新的網口eth*，firewall  加入wan，重新整理後看是否能夠自動獲取ip,獲取ip成功即可聯網！

&n