/******************************************************************** *                   I.MX6 网卡能收不能发 * 说明： *     MAC控制器到PHY之间的阻抗差异。 * *                                 2017-4-28 深圳 龙华樟坑村 曾剑锋 *******************************************************************/一、参考文档：    1. Understanding MII Transceiver Status Info        ftp://ftp.psu.ac.th/pub/scyld/mii-status.html    2. 关于以太网PAUSE的一点研究        http://www.latelee.org/programming-under-linux/ethernet-pause-frame-study.html二、U-Boot设定：setenv bootargs console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=384M androidboot.selinux=disabled; saveenv; reset;三、网络设定：    1. 设定ip：        ifconfig eth0 10.10.10.10 netmask 255.255.255.0    2. 主板抓包工具：        tcpdump -i eth0 host 10.10.10.10 &        tcpdump -vv -i eth0 host 10.10.10.10 &四、ethtool工具：    1. Android 5.1         root@sabresd_6dq:/ # ethtool eth0                                                      Settings for eth0:                Supported ports: [ TP MII ]                Supported link modes:   10baseT/Half 10baseT/Full                                         100baseT/Half 100baseT/Full                                         1000baseT/Full                 Supported pause frame use: Symmetric                Supports auto-negotiation: Yes                Advertised link modes:  10baseT/Half 10baseT/Full                                         100baseT/Half 100baseT/Full                                         1000baseT/Full                 Advertised pause frame use: Symmetric                Advertised auto-negotiation: Yes                Link partner advertised link modes:  100baseT/Half                 Link partner advertised pause frame use: No                Link partner advertised auto-negotiation: No                Speed: 100Mb/s                Duplex: Half                Port: MII                PHYAD: 1                Transceiver: external                Auto-negotiation: on                Supports Wake-on: g                Wake-on: d                Link detected: yes        root@sabresd_6dq:/ # mtp_open        libphy: 2188000.ethernet:01 - Link is Down        libphy: 2188000.ethernet:01 - Link is Up - 1000/Full        root@sabresd_6dq:/ # ethtool eth0                                                      Settings for eth0:                Supported ports: [ TP MII ]                Supported link modes:   10baseT/Half 10baseT/Full                                         100baseT/Half 100baseT/Full                                         1000baseT/Full                 Supported pause frame use: Symmetric                Supports auto-negotiation: Yes                Advertised link modes:  10baseT/Half 10baseT/Full                                         100baseT/Half 100baseT/Full                                         1000baseT/Full                 Advertised pause frame use: Symmetric                Advertised auto-negotiation: Yes                Link partner advertised link modes:  10baseT/Half 10baseT/Full                                                      100baseT/Half 100baseT/Full                                                      1000baseT/Full                 Link partner advertised pause frame use: Symmetric Receive-only                Link partner advertised auto-negotiation: Yes                Speed: 1000Mb/s                Duplex: Full                Port: MII                PHYAD: 1                Transceiver: external                Auto-negotiation: on                Supports Wake-on: g                Wake-on: d                Link detected: yes        root@sabresd_6dq:/ #                                                               2. Android 4.2        root@android:/data # ./ethtool eth0                                                    Settings for eth0:                Supported ports: [ TP MII ]                Supported link modes:   10baseT/Half 10baseT/Full                                         100baseT/Half 100baseT/Full                                         1000baseT/Full                 Supported pause frame use: Symmetric                Supports auto-negotiation: Yes                Advertised link modes:  10baseT/Half 10baseT/Full                                         100baseT/Half 100baseT/Full                                         1000baseT/Full                 Advertised pause frame use: Symmetric                Advertised auto-negotiation: Yes                Speed: 1000Mb/s                Duplex: Full                Port: MII                PHYAD: 1                Transceiver: external                Auto-negotiation: on                Link detected: yes        root@android:/data # PHY: 1:01 - Link is Down        PHY: 1:01 - Link is Up - 100/Half        root@android:/data # ./ethtool eth0                                                    Settings for eth0:                Supported ports: [ TP MII ]                Supported link modes:   10baseT/Half 10baseT/Full                                         100baseT/Half 100baseT/Full                                         1000baseT/Full                 Supported pause frame use: Symmetric                Supports auto-negotiation: Yes                Advertised link modes:  10baseT/Half 10baseT/Full                                         100baseT/Half 100baseT/Full                                         1000baseT/Full                 Advertised pause frame use: Symmetric                Advertised auto-negotiation: Yes                Speed: 100Mb/s                Duplex: Half                Port: MII                PHYAD: 1                Transceiver: external                Auto-negotiation: on                Link detected: yes五、AR8031寄存器值：    address 0x0 = 0x1000 .    address 0x1 = 0x796d .    address 0x2 = 0x4d .    address 0x3 = 0xd074 .    address 0x4 = 0x15e1 .    address 0x5 = 0xcde1 .    address 0x6 = 0xd .    address 0x7 = 0x2001 .    address 0x8 = 0x0 .    address 0x9 = 0x300 .    address 0xa = 0x3801 .    address 0xb = 0x0 .    address 0xc = 0x0 .    address 0xf = 0xa000 .    address 0x10 = 0x862 .    address 0x11 = 0xbc5c .    address 0x12 = 0x0 .    address 0x13 = 0x0 .    address 0x14 = 0x82c .    address 0x15 = 0x0 .    address 0x16 = 0x4e8 .    address 0x17 = 0x0 .    address 0x18 = 0x3200 .    address 0x19 = 0x3000 .    address 0x1a = 0x0 .    address 0x1b = 0x63e .    address 0x1c = 0x0 .    address 0x1f = 0x8100 .六、引脚重新配置：    #define MX6DL_ENET_PAD_CTRL (PAD_CTL_PKE | PAD_CTL_PUE  |               \                    PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED |                                   PAD_CTL_DSE_40ohm   | PAD_CTL_HYS)    #define PAD_CTL_PKE                     (1 << 12)      1 0000 0000 0000    #define PAD_CTL_PUE                     (1 << 13)     10 0000 0000 0000    #define PAD_CTL_PUS_100K_UP             (2 << 14)   1000 0000 0000 0000    #define PAD_CTL_SPEED_MED               (2 << 6)              1000 0000    #define PAD_CTL_DSE_40ohm               (6 << 3)                11 0000    #define PAD_CTL_HYS                     (1 << 8)            1 0000 0000                                                        1011 0001 1011 0000                                                        b1b0                                                        00013030        #define MX6DL_ENET_REF_CLK_PAD_CTRL     (PAD_CTL_PUE |  \                    PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED |                           PAD_CTL_DSE_40ohm | PAD_CTL_SRE_FAST)    #define PAD_CTL_PUE                     (1 << 13)     10 0000 0000 0000    #define PAD_CTL_PUS_100K_UP             (2 << 14)   1000 0000 0000 0000    #define PAD_CTL_SPEED_MED               (2 << 6)              1000 0000    #define PAD_CTL_DSE_40ohm               (6 << 3)                11 0000    #define PAD_CTL_HYS                     (1 << 8)            1 0000 0000