由于对网卡这块不是很熟悉，误以为网卡驱动也可以简单的配置下DTS就可以正常工作了，实际移植中遇到了些问题。闲话少说，下面开始tqimx6q的网卡驱动移植。
DTS编写
首先在我们的DTS中添加网卡配置，参考sabrelite的DTS，我们可以如下编写：
&fec {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_enet_1>;
phy-mode = "rgmii";
status = "okay";
};开始以为添加以上内容后编译并烧写DTB就可以正常工作了，实则不然，还需要添加PHY相关的配置代码。
PHY配置
打开arch/arm/mach-imx/mach-imx6q.c，在宏PHY_ID_AR8031附近做如下修改：
static int ar8035_phy_fixup(struct phy_device *dev)
{
u16 val;
/* Ar803x phy SmartEEE feature cause link status generates glitch,
* which cause ethernet link down/up issue, so disable SmartEEE
*/
phy_write(dev, 0xd, 0x3);
phy_write(dev, 0xe, 0x805d);
phy_write(dev, 0xd, 0x4003);
val = phy_read(dev, 0xe);
phy_write(dev, 0xe, val & ~(1 << 8));
/*
* Enable 125MHz clock from CLK_25M on the AR8031. This
* is fed in to the IMX6 on the ENET_REF_CLK (V22) pad.
* Also, introduce a tx clock delay.
*
* This is the same as is the AR8031 fixup.
*/
ar8031_phy_fixup(dev);
/*check phy power*/
val = phy_read(dev, 0x0);
if (val & BMCR_PDOWN)
</span>phy_write(dev, 0x0, val & ~BMCR_PDOWN);
return 0;
}
#define PHY_ID_AR8035 0x004dd072
static void __init imx6q_enet_phy_init(void)
{
if (IS_BUILTIN(CONFIG_PHYLIB)) {
phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
ksz9021rn_phy_fixup);
phy_register_fixup_for_uid(PHY_ID_KSZ9031, MICREL_PHY_ID_MASK,
ksz9031rn_phy_fixup);
phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
ar8031_phy_fixup);
phy_register_fixup_for_uid(PHY_ID_AR8035, 0xffffffff,
ar8035_phy_fixup);
}
}http://lxr.free-electrons.com/source/arch/arm/mach-imx/mach-imx6q.c
完成以上修改之后重新编译uImage和dtb，然后烧写开发板即可。
测试方法
寻求网卡的测试方法目标应该很明确，就是能ping通外网即可，下面是我在tqimx6q上的测试步骤。
Step1. 查看网卡信息
执行命令：
ifconfig -a效果如下：
@tqimx6q #ifconfig -a
eth0 Link encap:Ethernet HWaddr AA:EF:AE:8A:EA:05
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)
lo Link encap:Local Loopback
LOOPBACK 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:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 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:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)Step2. 使能网卡eth0，执行命令：
ifconfig eth0 up效果如下：
@tqimx6q #ifconfig eth0 up fec 2188000.ethernet eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=2188000.ethernet:00, irq=-1) IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready @tqimx6q #libphy: 2188000.ethernet:00 - Link is Up - 100/Full IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes readyStep3. 动态获取IP，执行指令：
udhcpc效果如下：
@tqimx6q #udhcpc udhcpc (v1.22.1) started Sending discover... Sending select for 192.168.0.106... Lease of 192.168.0.106 obtained, lease time 86400Step4. 将动态获取的IP设置给网卡eth0，执行指令：
ifconfig eth0 192.168.0.106之后可以通过命令查看网卡配置信息：
ifconfig eth0效果如下：
@tqimx6q #ifconfig eth0 192.168.0.106
@tqimx6q #ifconfig eth0
eth0 Link encap:Ethernet HWaddr AA:EF:AE:8A:EA:05
inet addr:192.168.0.106 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::a8ef:aeff:fe8a:ea05/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:253 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:24238 (23.6 KiB) TX bytes:1152 (1.1 KiB)Step5. 设置网关，执行指令：
route add default gw 192.168.0.1Step6. 通过ping指令测试网络状态，执行指令：
ping 8.8.8.8效果如下：
@tqimx6q #ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8): 56 data bytes 64 bytes from 8.8.8.8: seq=0 ttl=43 time=77.409 ms 64 bytes from 8.8.8.8: seq=1 ttl=43 time=83.292 ms 64 bytes from 8.8.8.8: seq=2 ttl=43 time=88.236 ms 64 bytes from 8.8.8.8: seq=3 ttl=43 time=80.713 ms 64 bytes from 8.8.8.8: seq=4 ttl=43 time=74.452 ms 64 bytes from 8.8.8.8: seq=5 ttl=43 time=78.627 ms可见，tqimx6q已经可以ping通谷歌的DNS服务器了。至此，网卡的移植工作就完成了，PHY相关的配置还没有仔细研究就来分享了，请见谅。文章编写匆忙，如有问题请帮忙指出，有疑问可以留言讨论。
本文作者：girlkoo
本文链接：http://blog.csdn.net/girlkoo/article/details/45678357
I.MX6Q(TQIMX6Q/TQE9)学习笔记——新版BSP之网卡驱动移植
原文地址：http://blog.csdn.net/girlkoo/article/details/45678357
