總共有兩種方式，推薦 第一種：

第一種，使用openwrt自帶的wifi驅動：
修改配置檔案，在結束前新增如下內容：

vi target/linux/ramips/dts/MT7620a.dts

        wmac@10180000{
                ralink,mtd-eeprom = <&factory 0>;
        };

make menuconfig 選上驅動：

Symbol: PACKAGE_kmod-rt2800-soc [=y]  
 Type  : tristate   
 Prompt: kmod-rt2800-soc...... Ralink Drivers for RT2x00 cards (RT28xx/R x
   Location: 
   -> Kernel
 
 modules 
     -> Wireless Drivers 

make V=s 編譯出來的韌體即帶有wifi驅動。

第二種：
下載mtk的wifi驅動包，解壓

tar xvf rt2860v2.tgz 

複製到openwrt的工程中：

cp rt2860v2 -rf /work/openwrt_cc/openwrt/package/kernel/ -rf

make menuconfig
可以看到多了一個 wifios 的選項
配置如下

 <*> kmod-rt2860v2.Driver for MT7x 
 [ ]   LED Support                                                         
 [*]
 
   WSC (WiFi Simple Config)                                            
 [*]     WSC 2.0(WiFi Simple Config 2.0) 
 [ ]   LLTD (Link Layer Topology Discovery Protocol)                       
 [*]   WDS                                                                 
 [*]   MBSSID                                                              
 [*]
 
   AP-CLient Support                                                           
 [ ]   IGMP snooping                                                       
 [ ]   NETIF Block                                                         
 [ ]   DFS 
 [ ]   Carrier Detect  
 [ ]   DLS ((Direct-Link Setup) Support  
 [ ]   IDS (Intrusion Detection System) Support  
 [*]   CoC Support                                                        
 [ ]   Memory Optimization   
 [ ]   Video Turbine support 
 [*]   802.11n Draft3 
 [*]   Single SKU