基礎知識

MiniPCI-e, 介面其實就是USB介面, 採用的USB協議.

USB協議中有product id, vendor id.

4G網絡卡的撥號方式有三種:
PPP (PPP over EV-DO, CDMA, UMTS or GPRS)
QMI (USB modems using QMI protocol)
NCM (USB modems using NCM protocol)

配置USB驅動

檢測方法是lsusb, 可以看到這個.
將USB的驅動中加入驅動中.

drivers/usb/serial/option.c 

static const struct usb_device_id option_ids[] = {
{ USB_DEVICE(0x161c, 0x9115) },
 

串列埠相關配置:

1、USB 串列埠驅動相關的配置項：
CONFIG_USB_SERIAL=y
CONFIG_USB_SERIAL_OPTION=y
CONFIG_USB_SERIAL_WWAN=y

make kernel_menuconfig

Device Drivers —>
USB support —>
USB Serial Converter support —> (預設是M，且不能設為*）

習慣上=y 使得編譯進核心而不是作為模組，那麼得配置好一些USB相關
<> Support for Host-side USB （預設M,選擇

方便USB Serial可以=y）
<*> USB announce new devices
[*] Enable USB persist by default
<*> EHCI HCD（USB 2.0) support
[*] Root Hub Transaction Translators
[*] Improved Transaction Translator scheduling
<*> OHCI HCD support
<*> USB Modem (CDC ACM) support
<*> USB Printer support
<*> USB Wireless Device Management support

USB Serial Converter support —>
<*> USB driver for GSM and CDMA modems

退出後儲存，git status檢視會修改target/linux/ramips/mt7620n/config-3.10 這裡便是核心的預設編譯配置檔案

2、PPP 撥號的相關配置項：
CONFIG_PPP=y
CONFIG_PPP_MULTILINK=y
CONFIG_PPP_FILTER=y
CONFIG_PPP_ASYNC=y
CONFIG_PPP_SYNC_TTY=y
CONFIG_PPP_DEFLATE=y
CONFIG_PPP_BSDCOMP=y

make kernel_menuconfig

Device Drivers —>
[*] Network device support —>
<*> PPP (point-to-point protocol) support
<*> PPP BSD-Compress compression
<*> PPP Deflate compression
[*] PPP filtering
[*] PPP multilink support
<*> PPP MPPE compression (encryption)
[*] PPP multilink support
<*> PPP over Ethernet
<*> PPP support for async serial ports
<*> PPP support for sync tty ports

1. 配置工具PPP需要
   Utilities —>
   <*> comgt

四、新增ppp0網路節點

target/linux/ramips/base-files/etc/uci-defaults/02_network

+       m201)
+               ucidef_set_interfaces_lan_wan "eth0.1" "eth0.2"
+               ucidef_set_interfaces_3g "ppp0"
+               ;;
+
        ur-336un)

package/base-files/files/lib/functions/uci-defaults.sh

+ucidef_set_interface_ppp0() {
+       local ifname=$1
+       
+       uci batch <<EOF
+set network.ppp0='interface'
+set network.ppp0.ifname='$ifname'
+set network.ppp0.proto='3g'
+set network.ppp0.apn='3gnet'
+set network.ppp0.service='umts'
+set network.ppp0.dialnumber='*99#'
+set network.ppp0.device='/dev/ttyUSB0'
+EOF
+}

+ucidef_set_interfaces_3g() {
+       local ppp0_ifname=$1
+       
+       ucidef_set_interface_ppp0 "$ppp0_ifname"
+}
+

package/network/config/firewall/files/firewall.config

config zone
+       option network          'wan ppp0'

除錯的時候可以手動設定（我這裡是華為MU709s-2 WCDMA 聯通3G）：
進入etc/config/修改network，增加一個3G 網路節點

config interface 'ppp0'
        option ifname 'ppp0'
        option proto '3g'
        option apn '3gnet'
        option service 'umts'
        option dialnumber '*99#'
        option device '/dev/ttyUSB0'

注：聯通apn：3gnet 電信apn：ctnet 移動apn：cmnet/cmwap
聯通dialnumber：3G為*99# 電信：3G為#777 移動為：*99***1# LTE為：*99#