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網(wǎng)卡是嵌入式產(chǎn)品常用的設(shè)備，這里我們需要完成網(wǎng)卡驅(qū)動的移植。FS4412使用的是DM9000網(wǎng)卡，我們通過這個實驗?zāi)軌蛄私馊绾卧趦?nèi)核中添加網(wǎng)卡驅(qū)動及網(wǎng)絡(luò)功能的基本配置。

由圖中可以看到如下內(nèi)容：

有16根數(shù)據(jù)線，所以總線寬度為16bit

中斷線為DM9000_IRQ對應(yīng)的XEINT6，也就是使用的終端是外部中斷6(EINT6)

片選線為BUF_Xm0cs1，即片選1，對應(yīng)的地址空間為0x05000000 – 0x06000000

所以設(shè)備樹文件中添加如下內(nèi)容：

$ vim arch/arm/boot/dts/exynos4412-fs4412.dts
        添加內(nèi)容：
        srom-cs1@5000000 {
                compatible = "simple-bus";
                #address-cells = <1>;
                #size-cells = <1>;
                reg = <0x5000000 0x1000000>;
                ranges;
        
                ethernet@5000000 {
                        compatible = "davicom,dm9000";
                        reg = <0x5000000 0x2 0x5000004 0x2>;
                        interrupt-parent = <&gpx0>;
                        interrupts = <6 4>;
                        davicom,no-eeprom;
                        mac-address = [00 0a 2d a6 55 a2];
                };
        };

參考文件：Documentation/devicetree/bindings/net/davicom-dm9000.txt

$ vimarch/arm/boot/dts/exynos4x12-pinctrl.dtsi
        gpx0: gpx0 {
        gpio-controller;
        #gpio-cells = <2>;
        
        interrupt-controller;
        interrupt-parent = <&gic>;
        interrupts = <0 16 0>, <0 17 0>, <0 18 0>, <0 19 0>,
        <0 20 0>, <0 21 0>, <0 22 0>, <0 23 0>;
        #interrupt-cells = <2>;
        };
        

外部中斷6對應(yīng)的GPIO口為GPX0_6，所以：
        interrupt-parent = <&gpx0>;
        外部中斷6對應(yīng)的是gic中的22所以
        
        interrupts = <6 4>; 6對應(yīng)的是外部中斷6也就是gic中的22,4為高電平觸發(fā)中斷

參考內(nèi)容：Documentation/devicetree/bindings/arm/gic.txt

Documentation/devicetree/bindings/arm/samsung/interrupt-combiner.txt

配置內(nèi)核：

makemenuconfig
        //網(wǎng)卡相關(guān)選項
        [*] Networking support --->
        Networking options --->
        <*> Packet socket
        <*>Unix domain sockets 
        [*] TCP/IP networking
        [*] IP: kernel level autoconfiguration
        //DM9000網(wǎng)卡相關(guān)選項
        Device Drivers --->
        [*] Network device support --->
        [*] Ethernet driver support (NEW) --->
        <*> DM9000 support
        //NFS 相關(guān)選項
        File systems --->
        [*] Network File Systems (NEW) --->
        <*> NFS client support
        [*] NFS client support for NFS version 3
        [*] NFS client support for the NFSv3 ACL protocol extension
        [*] Root file system on NFS

編譯內(nèi)核和設(shè)備樹

$ make uImage
        $ make dtbs

設(shè)置系統(tǒng)啟動參數(shù)如果使用NFS啟動的話，則可以通過NFS掛載根文件系統(tǒng)