RK3568网卡设置百兆失败
将eth1 网口设置成百兆网口， 但更新系统后，仍然显示千兆网口， 未配置成功gamco 配置：
&gmac0 {
233 phy-mode = "rgmii";
234 clock_in_out = "input";
235 // clock_in_out = "output";
236
237 /* snps,reset-gpio = <&gpio2 RK_PD3 GPIO_ACTIVE_LOW>; */
238 snps,reset-gpio = <&gpio0 RK_PD5 GPIO_ACTIVE_LOW>;
239 snps,reset-active-low;
240 /* Reset time is 20ms, 100ms for rtl8211f */
241 snps,reset-delays-us = <0 20000 100000>;
242
243 assigned-clocks = <&cru SCLK_GMAC0_RX_TX>, <&cru SCLK_GMAC0>;
244 assigned-clock-parents = <&cru SCLK_GMAC0_RGMII_SPEED>, <&gmac0_clkin>;
248 pinctrl-names = "default";
249 pinctrl-0 = <&gmac0_miim
250 &gmac0_tx_bus2
251 &gmac0_rx_bus2
252 &gmac0_rgmii_clk
253 &gmac0_rgmii_bus
254 &gmac0_clkinout>;
255
256 tx_delay = <0x3c>;
257 rx_delay = <0x2f>;
258
259 phy-handle = <&rgmii_phy0>;
260 status = "disabled";
261 };
时钟配置：：
433 gmac0_clkin: external-gmac0-clock {
434 compatible = "fixed-clock";
435 clock-frequency = <50000000>;
436 clock-output-names = "gmac0_clkin";
437 #clock-cells = <0>;
438 };
439
结果:仍显示千兆网卡
firefly@firefly:~$ dmesg |grep eth1
[ 5.969001] rk_gmac-dwmac fe2a0000.ethernet eth1: No Safety Features support found
[ 5.969023] rk_gmac-dwmac fe2a0000.ethernet eth1: IEEE 1588-2008 Advanced Timestamp supported
[ 5.969350] rk_gmac-dwmac fe2a0000.ethernet eth1: registered PTP clock
[ 5.971211] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 6.995233] rk_gmac-dwmac fe2a0000.ethernet eth1: Link is Up - 1Gbps/Full - flow control rx/tx
[ 6.995319] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
请查看SDK中docs/GMAC/Rockchip_Developer_Guide_Linux_GMAC_Mode_Configuration_CN.pdf文档学习3568的RMII模式设置 可以在系统设置成100M：ethtool -s eth1 speed 100 autoneg off
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