一、确认硬件接口
phy1：
phy2：
PHY 地址设置：
以上三管脚要接上拉电阻时候，需接到 DVDD_RGMII 电压上；
二、软件配置
覆盖规则：板级配置文件board.dts会覆盖sun55iw3p1.dtsi
1、设备树：
bsp/configs/linux-5.15/sun55iw3p1.dtsi
gmac0: gmac0@4500000 {
compatible = "allwinner,sunxi-gmac";
reg = <0x0 0x04500000 0x0 0x10000>,
<0x0 0x03000030 0x0 0x4>;
interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "gmacirq";
clocks = <&ccu CLK_GMAC0>, <&ccu CLK_GMAC0_25M>;
clock-names = "gmac", "phy25m";
resets = <&ccu RST_BUS_GMAC0>;
phy-handle = <&gmac0_phy0>;
status = "disabled";
};
gmac1: ethernet@4510000 {
compatible = "allwinner,sunxi-gmac-200", "snps,dwmac-4.20a";
reg = <0x0 0x04510000 0x0 0x10000>,
<0x0 0x03000034 0x0 0x4>;
interrupts = <GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "macirq";
clocks = <&ccu CLK_GMAC1>, <&ccu CLK_GMAC1_MBUS_GATE>, <&ccu CLK_GMAC1_25M>;
clock-names = "stmmaceth", "pclk", "phy25m";
resets = <&ccu RST_BUS_GMAC1>;
reset-names = "stmmaceth";
phy-handle = <&gmac1_phy0>;
power-domains = <&pd1 A523_PCK_VO1>;
status = "disabled";
snps,fixed-burst;
snps,axi-config = <&gmac1_stmmac_axi_setup>;
snps,mtl-rx-config = <&gmac1_mtl_rx_setup>;
snps,mtl-tx-config = <&gmac1_mtl_tx_setup>;
gmac1_stmmac_axi_setup: stmmac-axi-config {
snps,wr_osr_lmt = <0xf>;
snps,rd_osr_lmt = <0xf>;
snps,blen = <256 128 64 32 16 8 4>;
};
gmac1_mtl_rx_setup: rx-queues-config {
snps,rx-queues-to-use = <1>;
queue0 {};
};
gmac1_mtl_tx_setup: tx_queues-config {
snps,tx-queues-to-use = <1>;
queue0 {};
};
mdio1: mdio1@1 {
compatible = "snps,dwmac-mdio";
#address-cells = <1>;
#size-cells = <0>;
gmac1_phy0: ethernet-phy@1 {
compatible = "ethernet-phy-ieee802.3-c22";
reg = <1>;
max-speed = <1000>; /* Max speed capability */
reset-gpios = <&pio PJ 27 GPIO_ACTIVE_LOW>;
/* PHY datasheet rst time */
reset-assert-us = <10000>;
reset-deassert-us = <150000>;
};
};
};
device/config/chips/t527/configs/demo_linux_car/linux-5.15/board.dts
&gmac0 {
phy-mode = "rgmii";
pinctrl-names = "default", "sleep";
pinctrl-0 = <&gmac0_pins_default>;
pinctrl-1 = <&gmac0_pins_sleep>;
sunxi,phy-clk-type = <0>;//使用内部时钟还是外部时钟
tx-delay = <3>;
rx-delay = <4>;
gmac3v3-supply = <®_cldo3>;
status = "okay";
};
&gmac1 {
phy-mode = "rgmii";
pinctrl-names = "default", "sleep";
pinctrl-0 = <&gmac1_pins_default>;
pinctrl-1 = <&gmac1_pins_sleep>;
aw,soc-phy25m;//有这个属性表示使用soc提供的内部25M
tx-delay = <3>;
rx-delay = <4>;
dwmac3v3-supply = <®_cldo3>;
status = "okay";
mdio1: mdio1@1 {
gmac1_phy0: ethernet-phy@1 {
reset-gpios = <&pio PJ 18 GPIO_ACTIVE_LOW>;
};
};
};
2、引脚信息：
3、Kconfig：
路径：/drivers/net/phy/Kconfig
+config MOTORCOMM_PHY
tristate "Motorcomm PHYs"
---help---
Supports the YT8010, YT8510, YT8511, YT8512 PHYs.4、Makefile：
路径：/drivers/net/phy/Makefile
obj-$(CONFIG_XILINX_GMII2RGMII) += xilinx_gmii2rgmii.o
+obj-$(CONFIG_MOTORCOMM_PHY) += motorcomm.o5、menuconfig内核中勾选motorcomm
如果需要保存该.config 配置到相应的 defconfig 里面，可以到 Tina5.0 根目录下执行以下指令。
./build.sh saveconfig6、驱动
kernel/linux-5.15/drivers/net/phy/motorcomm.c三、测试
1、查看驱动：
ls /sys/bus/mdio_bus/drivers
移植驱动完成后有以下打印信息：
PHY ID 4f51e91b at 1 IRQ poll (4500048.mdio0-mii:01)
PHY [stmmac-0:01] driver [YT8531 Gigabit Ethernet] (irq=POLL)2、网卡查看：ifconfig -a
3、打开网卡
ifconfig eth0 up
ifconfig eth1 up4、关闭网卡
ifconfig eth0 down
ifconfig eth1 down5、设置静态IP：
ifconfig eth0 172.16.112.244
6、获取 IP 地址
udhcpc -i eth0
udhcpc -i eth17、设置速率：
ethtool -s eth0 speed 1000 duplex full autoneg on
ethtool -s eth speed 1000 duplex full autoneg off测试芯片外围，TX 和 RX 发现 tx clk 时钟 125M ，而 rx clk 是25M，phy 芯片 在 1000M 速率下 TX 和 RX 时钟都应为 125M
Ping百度出现bad address 'www.baidu.com'
解决方法：
1.设置IP
首先打开文 件 vi /etc/network/interfaces在
auto lo
iface lo inet loopback
加上
auto eth0
iface eth0 inet dhcp
2.配置DNS
打开文件vi /etc/resolv.conf
加入
nameserver 8.8.8.8
nameserver 8.8.4.4
2、重启
最后ping www.baidu.com结果如下
8、iperf3速率测试
iperf3 -s
iperf3 -c IP iperf3 -u -c 172.16.112.75 -i 1 -b 1000M -l 65507
route add default gw 172.16.112.1测试出现千兆速率不达标情况
四、问题分析
排查点1：
SOC会给PHY提供一个25M的时钟
和下方25M晶振重复，只能使用一个，去掉晶振
排查点2：
根据芯片手册：
发现引脚反了
更改引脚后，示波器测量TX RX的CLK均为125M
再次ping时出现丢包问题，排查解决丢包问题，是否丢包引起速率不达标现象
调整TX RX时延:
调试方法如下：请注意rx_delay和tx_delay的范围（tx_delay【0~7】；rx_delay【0~31】）
cd /sys/devices/platform/soc@3000000/4500000.gmac0
echo xx > tx_delay
echo xx > rx_delay
查看当前tx_delay/rx_delay数值的方法
cat tx_delay
cat rx_delay
cat /sys/devices/platform/soc@3000000/4500000.gmac0/tx_delay
echo xx > /sys/devices/platform/soc@3000000/4500000.gmac0/tx_delay发现tx_delay的范围在：0~3 rx_delay的范围4~18 ，丢包率在0到4左右
修改后不丢包速率正常
排查点三：eth1
ifconfig eth1后不能link，偶尔会出现下述情况
用示波器测量外部供电，时钟，发现soc连接phy25M时钟为0
查看硬件
发现SOC的25M时钟未连接到phy
硬件连接好后，eth1能正常link
与PC端ping
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