V853有线网络无法连接

[Negro]

1. 板子型号是全志官方的V853开发板；
2. 自己编译的固件，网卡相关的配置如下：
   a) 内核中menuconfig -> Device Drivers -> Network device support -> Ethernet driver support -> Use extern phy 已设置编入内核（默认就有的）
   b) device/config/chips/v853/configs/vision/board.dts 中的 gmac节点已打开，配置如下：

&gmac0{
     phy-mode = "rmii";
     use_ephy25m = <1>;
     pinctrl-0 = <&gmac0_pins_a>;
     pinctrl-1 = <&gmac0_pins_b>;
     pinctrl-names = "default", "sleep";
     tx-delay = <7>;
     rx-delay = <31>;
     status = "okay";
 };

。。。

    gmac0_pins_a: gmac0@0 {
        allwinner,pins = "PE0", "PE1", "PE2", "PE3",
                "PE4", "PE5", "PE6", "PE7",
                "PE8", "PE9", "PE10", "PE11",
                "PE12", "PE13", "PE14", "PE15";
        allwinner,function = "rgmii";
        allwinner,drive = <1>; 
        allwinner,muxsel = <3>; 
        allwinner,pull = <0>; 
    };   

    gmac0_pins_b: gmac0@1 {
        allwinner,pins = "PE0", "PE1", "PE2", "PE3",
                "PE4", "PE5", "PE6", "PE7",
                "PE8", "PE9", "PE10", "PE11",
                "PE12", "PE13", "PE14", "PE15";
        allwinner,function = "gpio_in";
        allwinner,drive = <0>; 
        allwinner,muxsel = <0>; 
        allwinner,pull = <0>; 
    };

3. ./build.sh 编译后打包成固件，刷到板子上后。进行如下操作：

root@TinaLinux:/# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 3E:35:B2:47:65:1E  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:59 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

p2p0      Link encap:Ethernet  HWaddr 3C:21:4A:66:69:26  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

wlan0     Link encap:Ethernet  HWaddr 3C:21:4A:66:69:25  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
 
root@TinaLinux:/# ifconfig eth0 up
[   46.729092] libphy: gmac0: probed
[   46.733505] sunxi-gmac gmac0 eth0: eth0: Type(6) PHY ID 02430c54 at 1 IRQ poll (gmac0-0:01)
[   46.753881] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
root@TinaLinux:/# 
root@TinaLinux:/# [   48.850744] sunxi-gmac gmac0 eth0: Link is Up - 100Mbps/Full - flow control off
[   48.859036] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
root@TinaLinux:/# udhcpc -i eth0
udhcpc: started, v1.33.2
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover

无法获取到IP地址，上不了网。是不是有哪些地方没有配置好呢？希望大神可以帮我看下，谢谢。

[YterAA]

配置dhcp获取ip，ifconfig eth0 up

[Negro]

@yteraa 感谢回复。这个DHCP的配置有说明吗？

[YuzukiTsuru]

@negro 不用配置，ifconfig eth0 up就行

[Negro]

@yuzukitsuru 非常感谢。确实可以了。不过非常奇怪，我昨天就是直接接网线，然后执行ifconfig eth0 up 是没有IP地址的。现在就有了。
难道是网线要在执行up的命令后接入才可以？我刚试一下，执行up命令后需要重新插拔网线才可以。非常感谢

[whycan]

@negro
应该是当时网络有问题，多执行几次 udhcpc -i eth0 直到获取IP成功。