修改网口配置信息
主要修改设备树的信息，设备树位于：arch/arm/dts/imx6ul-14x14-evk.dtsi
硬件电路图
修改fec2信息
未修改前的信息如下：
修改网口1器件的ID信息，网口1使用的ID是0
&fec2 {pinctrl-names = "default";pinctrl-0 = <&pinctrl_enet2>;phy-mode = "rmii";phy-handle = <ðphy1>;status = "okay";mdio {#address-cells = <1>;#size-cells = <0>;/* 网口1的设备ID是0设置为@0 */ethphy0: ethernet-phy@0 {/* reg的值要修改为0 */reg = <0>;micrel,led-mode = <1>;clocks = <&clks IMX6UL_CLK_ENET_REF>;clock-names = "rmii-ref";};ethphy1: ethernet-phy@1 {reg = <1>;micrel,led-mode = <1>;clocks = <&clks IMX6UL_CLK_ENET2_REF>;clock-names = "rmii-ref";};};
};
IO信息修改
注释掉SPI4的引脚信息
从上面的原理图可知网口1使用的复位引脚是GPIO5_IO07，网口2使用的复位引脚是GPIO5_IO08，在官网的u-boot里面这两个引脚被用于SPI4，所以我们需要去注释掉他，位置如下图所示：
修改如下：
pinctrl_spi4: spi4grp {fsl,pins = <MX6UL_PAD_BOOT_MODE0__GPIO5_IO10 0x70a1MX6UL_PAD_BOOT_MODE1__GPIO5_IO11 0x70a1/* 直接注释掉 *//* MX6UL_PAD_SNVS_TAMPER7__GPIO5_IO07 0x70a1MX6UL_PAD_SNVS_TAMPER8__GPIO5_IO08 0x80000000 */>;
};
还需要把SPI4修改的设备树信息进行修改，位置如下：
修改如下:
spi4 {compatible = "spi-gpio";pinctrl-names = "default";pinctrl-0 = <&pinctrl_spi4>;status = "okay";/* 注释掉GPIO5_IO08相关的信息 *//* pinctrl-assert-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>; */gpio-sck = <&gpio5 11 0>;gpio-mosi = <&gpio5 10 0>;/* 注释掉GPIO5_IO07相关的信息 *//* cs-gpios = <&gpio5 7 0>; */num-chipselects = <1>;#address-cells = <1>;#size-cells = <0>;gpio_spi: gpio@0 {compatible = "fairchild,74hc595";gpio-controller;#gpio-cells = <2>;reg = <0>;registers-number = <1>;registers-default = /bits/ 8 <0x57>;spi-max-frequency = <100000>;};
};修改网口TX时钟的电器属性值
修改的位置如下:
需要把0x4001b031修改为:0x4001b009
修改结果如下:
pinctrl_enet1: enet1grp {fsl,pins = <MX6UL_PAD_ENET1_RX_EN__ENET1_RX_EN 0x1b0b0MX6UL_PAD_ENET1_RX_ER__ENET1_RX_ER 0x1b0b0MX6UL_PAD_ENET1_RX_DATA0__ENET1_RDATA00 0x1b0b0MX6UL_PAD_ENET1_RX_DATA1__ENET1_RDATA01 0x1b0b0MX6UL_PAD_ENET1_TX_EN__ENET1_TX_EN 0x1b0b0MX6UL_PAD_ENET1_TX_DATA0__ENET1_TDATA00 0x1b0b0MX6UL_PAD_ENET1_TX_DATA1__ENET1_TDATA01 0x1b0b0/* 0x4001b031修改为0x4001b009 */MX6UL_PAD_ENET1_TX_CLK__ENET1_REF_CLK1 0x4001b009>;};pinctrl_enet2: enet2grp {fsl,pins = <MX6UL_PAD_GPIO1_IO07__ENET2_MDC 0x1b0b0MX6UL_PAD_GPIO1_IO06__ENET2_MDIO 0x1b0b0MX6UL_PAD_ENET2_RX_EN__ENET2_RX_EN 0x1b0b0MX6UL_PAD_ENET2_RX_ER__ENET2_RX_ER 0x1b0b0MX6UL_PAD_ENET2_RX_DATA0__ENET2_RDATA00 0x1b0b0MX6UL_PAD_ENET2_RX_DATA1__ENET2_RDATA01 0x1b0b0MX6UL_PAD_ENET2_TX_EN__ENET2_TX_EN 0x1b0b0MX6UL_PAD_ENET2_TX_DATA0__ENET2_TDATA00 0x1b0b0MX6UL_PAD_ENET2_TX_DATA1__ENET2_TDATA01 0x1b0b0/* 0x4001b031修改为0x4001b009 */MX6UL_PAD_ENET2_TX_CLK__ENET2_REF_CLK2 0x4001b009>;};
增加网口复位引脚的信息
引脚复位信息增加在下面的位置，如下：
下面是相关代码段，可以直接复制：
pinctrl_enet1_reset: enet1resetgrp {fsl,pins = <MX6ULL_PAD_SNVS_TAMPER7__GPIO5_IO07 0x10B0>;};pinctrl_enet2_reset: enet2resetgrp {fsl,pins = <MX6ULL_PAD_SNVS_TAMPER8__GPIO5_IO08 0x10B0>;};
为网口的信息增加pinctrl信息
需要修改的位置如下：
修改后的信息如下:
&fec1 {pinctrl-names = "default";/* 增加pinctrl_enet1_reset */pinctrl-0 = <&pinctrl_enet1 &pinctrl_enet1_reset>;phy-mode = "rmii";phy-handle = <ðphy0>;/* 设置复位有效电平和持续时间 */phy-reset-gpios = <&gpio5 7 GPIO_ACTIVE_LOW>;phy-rest-duration = <200>;status = "okay";
};
&fec2 {pinctrl-names = "default";/* 增加pinctrl_enet2_reset */pinctrl-0 = <&pinctrl_enet2 &pinctrl_enet2_reset>;phy-mode = "rmii";phy-handle = <ðphy1>;/* 设置复位有效电平和持续时间 */phy-reset-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>;phy-rest-duration = <200>;status = "okay";mdio {#address-cells = <1>;#size-cells = <0>;ethphy0: ethernet-phy@0 {reg = <0>;/* 增加当前的PHY为smsc */smsc,led-mode = <1>;clocks = <&clks IMX6UL_CLK_ENET_REF>;clock-names = "rmii-ref";};ethphy1: ethernet-phy@1 {reg = <1>;/* 增加当前的PHY为smsc */smsc,led-mode = <1>;clocks = <&clks IMX6UL_CLK_ENET2_REF>;clock-names = "rmii-ref";};};
};
增加SMSC系列的芯片的支持
make menuconfig
选择Microchip(SMSC) Ethernet PHYs support修改配置
重新编译烧录验证
export CROSS_COMPILE=arm-buildroot-linux-gnueabihf-
export ARCH=arm
make -j4
#烧录
sudo dd iflag=dsync oflag=dsync if=u-boot-dtb.imx bs=1k of=/dev/sdb seek=1
在板子上进行验证如下
在板子上启动可能会出现如下错误信息,这个信息是没有配置网口的地址导致的，下面进行配置即可:
Net: Could not get PHY for FEC1: addr 1Error: ethernet@20b4000 address not set.Error: ethernet@20b4000 address not set.Error: ethernet@20b4000 address not set.
Could not get PHY for FEC0: addr 0Error: ethernet@20b4000 address not set.Error: ethernet@20b4000 address not set.
Could not get PHY for FEC0: addr 0
No ethernet found.u-boot默认使用网口2,我使用路由器与板子相连，板子的网关地址为192.168.2.1,先配置网络信息如下：
setenv ipaddr 192.168.2.230
setenv ethaddr 00:04:9f:04:d2:35
setenv eth1addr 00:04:9f:04:d2:36
setenv gatewayip 192.168.2.1
setenv netmask 255.255.255.0
saveenv
进行ping路由器
结果如下：
ping 192.168.2.1
Get shared mii bus on ethernet@2188000
ethernet@20b4000 Waiting for PHY auto negotiation to complete.... done
Using ethernet@20b4000 deviceARP Retry count exceeded; starting again
ping failed; host 192.168.2.1 is not alive
是由于PHY复位失败，所以需要修改drivers/net/phy/phy.c的genphy_config_aneg函数代码，位置如下：
修改结果如下：
int genphy_config_aneg(struct phy_device *phydev)
{int result;/* 新增加这条复位代码 */phy_reset(phydev);if (phydev->autoneg != AUTONEG_ENABLE)return genphy_setup_forced(phydev);result = genphy_config_advert(phydev);if (result < 0) /* error */return result;if (result == 0) {/** Advertisment hasn't changed, but maybe aneg was never on to* begin with? Or maybe phy was isolated?*/int ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);if (ctl < 0)return ctl;if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))result = 1; /* do restart aneg */}/** Only restart aneg if we are advertising something different* than we were before.*/if (result > 0)result = genphy_restart_aneg(phydev);return result;
}
