1、添加VID、PID
在linux_src/drivers/usb/serial/option.c 文件中的
static const struct usb_device_id option_ids[]的id 列表中增长以下语句:
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
openwrt-1407在以下位置:
build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7620n/linux-3.10.49/drivers/usb/serial/option.c
2、内核的编译配置
包括USB串口驱动和PPP拨号相关的配置项：
一、USB 串口驱动相关的配置项：
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 ---> (默认是M，且不能设为*）
习惯上=y 使得编译进内核而不是做为模块，那么得配置好一些USB相关
<*> Support for Host-side USB （默认M,选择* 方便USB Serial能够=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
退出后保存，git status查看会修改target/linux/ramips/mt7620n/config-3.10 这里即是内核的默认编译配置文件
二、PPP 拨号的相关配置项：
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
3、其它配置
make menuconfig
一、界面LuCI配置（web页面管理程序）
LuCI --->
1. Collections --->
<*> luci
3. Applications --->
<*> luci-app-commands
<*> luci-app-ddns
<*> luci-app-ntpc
二、网络配置
Netmowrk --->
File Transfer --->
<*> wget
SSH --->
<*> openssh-client
<*> openssh-sftp-server
三、工具配置
Utilities --->
<*> comgt
4、添加ppp0网络节点
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'
调试的时候能够手动设置（我这里是华为MU709s-2 WCDMA 联通3G）：
进入etc/config/修改network，增长一个3G 网络节点
config interface 'ppp0'
option ifname 'ppp0'
option proto '3g'
option apn '3gnet'
option service 'umts'
option dialnumber '*99#'
option device '/dev/ttyUSB0'
注：联通apn：3gnet 电信apn：ctnet 移动apn：cmnet/cmwap
联通dialnumber：3G为*99# 电信：3G为#777 移动为：*99***1# LTE为：*99#
拨号成功：
ifconfig
3g-ppp0 Link encap:Point-to-Point Protocol
inet addr:10.229.7.143 P-t-P:10.64.64.64 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:17 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:844 (844.0 B) TX bytes:854 (854.0 B)
5、参考资料 openwrt官网 Use 3g/UMTS USB Dongle for WAN connection： http://wiki.openwrt.org/doc/recipes/3gdongle Wired WAN + 3G dongle： http://wiki.openwrt.org/doc/howto/wired.wan.with.3g.dongle Get your WAN interface up using ifup wan (or /etc/init.d/network restart if you changed more stuff; a reboot if you changed even more). 小笔记： 一、使用cat /sys/kernel/debug/usb/devices 看USB的VID, PID 二、gcom -d /dev/ttyUSB0 info