nvidia xavier平台lan7800网卡驱动调试记录（1）驱动&硬件搭建

1. 前言

由于xavier平台有双网卡需求，所以需要额外增加一路USB 千兆网卡；
型号使用lan7800芯片；

2. 开启内核驱动支持

进入Linux_for_Tegra/sources/kernel/kernel-4.9

make ARCH=arm64 menuconfig

如上是支持LAN78XX驱动的；
按照上面编译成ko模块即可。

3. 连接硬件&查看网络连接

（1）连接硬件
如下： 使用lan7800 demo板【typec接口】
（插上平板上使用上网正常）

（2）加载驱动
insmod lan78xx.ko

驱动加载log如下：

发现USB部分有报错问题

（3）解决USB报错问题

解决办法如下；
将USB部分的设备树dts全部恢复成官方配置

修改tegra194-p2888-0001-p2822-0000-common.dtsi

    ports {
            usb2-0 {
                mode = "otg";
                status = "okay";
            };
            usb2-1 {
                mode = "host";
                status = "okay";
            };
            usb2-2 {
                mode = "host";
                status = "okay";
            };
            usb2-3 {
                mode = "host";
                status = "okay";
            };
            usb3-0 {
                nvidia,usb2-companion = <1>;
                status = "okay";
            };
            usb3-2 {
                nvidia,usb2-companion = <0>;
                status = "okay";
            };
            usb3-3 {
                nvidia,usb2-companion = <3>;
                nvidia,usb3-gen1-only= <1>;
                status = "okay";
            };
        };
    };

    tegra_xudc: xudc@3550000 {
        extcon-cables = <&typec_port0 0>;
        extcon-cable-names = "vbus";
        #extcon-cells = <1>;
#if TEGRA_XUSB_PADCONTROL_VERSION >= DT_VERSION_2
        phys = <&{/xusb_padctl@3520000/pads/usb2/lanes/usb2-0}>,
            <&{/xusb_padctl@3520000/pads/usb3/lanes/usb3-2}>;
        phy-names = "usb2", "usb3";
        nvidia,xusb-padctl = <&xusb_padctl>;
#endif
        nvidia,boost_cpu_freq = <1200>;
        status = "okay";
    };

    tegra_xhci: xhci@3610000 {
        extcon-cables = <&typec_port0 1>;
        extcon-cable-names = "id";
        #extcon-cells = <1>;
#if TEGRA_XUSB_PADCONTROL_VERSION >= DT_VERSION_2
        phys = <&{/xusb_padctl@3520000/pads/usb2/lanes/usb2-0}>,
            <&{/xusb_padctl@3520000/pads/usb2/lanes/usb2-1}>,
            <&{/xusb_padctl@3520000/pads/usb2/lanes/usb2-3}>,
            <&{/xusb_padctl@3520000/pads/usb2/lanes/usb2-2}>,
            <&{/xusb_padctl@3520000/pads/usb3/lanes/usb3-2}>,
            <&{/xusb_padctl@3520000/pads/usb3/lanes/usb3-0}>,
            <&{/xusb_padctl@3520000/pads/usb3/lanes/usb3-3}>;
        phy-names = "usb2-0", "usb2-1", "usb2-3", "usb2-2",
            "usb3-2", "usb3-0", "usb3-3";
        nvidia,xusb-padctl = <&xusb_padctl>;
#endif
        status = "okay";
    };

    arm-pmu {
        status = "okay";
    };

修改tegra194-power-tree-p2888-0001-p2822-1000.dtsi

    xusb_padctl@3520000 {
        pex_dvdd-supply = <&p2888_spmic_sd0>;
        pex_hvdd-supply = <&p2888_spmic_sd1>;
        pex_pll_hvdd-supply = <&p2888_spmic_sd1>;
        vclamp_usb-supply = <&p2888_spmic_sd3>;
        avdd_usb-supply = <&p2888_spmic_ldo5>;
        avdd_pll_nvhs_eutmip-supply = <&p2888_spmic_sd1>;
        ports {
            usb2-0 {
                vbus-supply = <&battery_reg>;
            };
            usb2-1 {
                vbus-supply = <&battery_reg>;
            };
            usb2-2 {
                vbus-supply = <&battery_reg>;
            };
            usb2-3 {
                vbus-supply = <&p2822_vdd_5v_sata>;
            };
        };
    };

现在加载正常

（4）查看虚拟网卡

如下eth1是 lan7800对应的网卡

（5）查看网络通路情况
a. 插上网线，无法上网

b. 配置静态ip地址，和主机PC直连ping 通路，也无法ping通

设置/etc/network/interfaces

    auto lo
iface lo inet loopback

auto eth1
iface eth1 inet static
address 192.168.10.66
netmask 255.255.255.0
gateway 192.168.10.1
iface eth1 inet6 auto