How can i change the interface RGMII to RMII using CubeMX?

[SPark.15]

Hello Guys

​

Like the subject, I want change the interface RGMII to RMII using CubeMX.

(RealTek-RTL8211EG-VB-CG => Microchip - LAN8720AI-CP)

Based on STM32MP157C-EV1 Code in CubeMX, I changed the Ethernet option from RGMII to RMII as shown in the picture below.

​

And after Code Generating, I applied it to my addon(mx) directory and built it.

(Changed to the code generated by CubeMX.)

 eth1_pins_mx: eth1_mx-0 {
 pins1 {
 pinmux = <STM32_PINMUX('A', 1, AF11)>, /* ETH1_REF_CLK */
 <STM32_PINMUX('C', 1, AF11)>, /* ETH1_MDC */
 <STM32_PINMUX('G', 13, AF11)>, /* ETH1_TXD0 */
 <STM32_PINMUX('G', 14, AF11)>; /* ETH1_TXD1 */
 bias-disable;
 drive-push-pull;
 slew-rate = <1>;
 };
 pins2 {
 pinmux = <STM32_PINMUX('A', 2, AF11)>; /* ETH1_MDIO */
 bias-disable;
 drive-push-pull;
 slew-rate = <0>;
 };
 pins3 {
 pinmux = <STM32_PINMUX('A', 7, AF11)>, /* ETH1_CRS_DV */
 <STM32_PINMUX('C', 4, AF11)>, /* ETH1_RXD0 */
 <STM32_PINMUX('C', 5, AF11)>; /* ETH1_RXD1 */
 bias-disable;
 };
 pins4 {
 pinmux = <STM32_PINMUX('B', 11, AF11)>; /* ETH1_TX_EN */
 };
 };
 
 eth1_sleep_pins_mx: eth1_sleep_mx-0 {
 pins {
 pinmux = <STM32_PINMUX('A', 1, ANALOG)>, /* ETH1_REF_CLK */
 <STM32_PINMUX('A', 2, ANALOG)>, /* ETH1_MDIO */
 <STM32_PINMUX('A', 7, ANALOG)>, /* ETH1_CRS_DV */
 <STM32_PINMUX('B', 11, ANALOG)>, /* ETH1_TX_EN */
 <STM32_PINMUX('C', 1, ANALOG)>, /* ETH1_MDC */
 <STM32_PINMUX('C', 4, ANALOG)>, /* ETH1_RXD0 */
 <STM32_PINMUX('C', 5, ANALOG)>, /* ETH1_RXD1 */
 <STM32_PINMUX('G', 13, ANALOG)>, /* ETH1_TXD0 */
 <STM32_PINMUX('G', 14, ANALOG)>; /* ETH1_TXD1 */
 };
 };
 
 
&ethernet0{
 pinctrl-names = "default", "sleep";
 pinctrl-0 = <&eth1_pins_mx>;
 pinctrl-1 = <&eth1_sleep_pins_mx>;
 status = "okay";
 
 /* USER CODE BEGIN ethernet0 */
 phy-mode = "rgmii-id";
 /*phy-mode = "rmii";*/
 max-speed = <1000>;
 phy-handle = <&phy0>;
 
 mdio0{
 #address-cells = <1>; 
 #size-cells = <0>; 
 compatible = "snps,dwmac-mdio";
 
 phy0:ethernet-phy@0{
 reg = <0>; 
 };
 }; 
 /* USER CODE END ethernet0 */
};

However, it seems that the ethernet chip is not recognized as shown in the log below.

~# dmesg | grep eth
[ 0.000000] psci: probing for conduit method from DT.
[ 1.236408] usbcore: registered new interface driver cdc_ether
[ 2.756520] stm32-dwmac 5800a000.ethernet: PTP uses main clock
[ 2.760976] stm32-dwmac 5800a000.ethernet: no reset control found
[ 2.767028] stm32-dwmac 5800a000.ethernet: No phy clock provided...
[ 2.773905] stm32-dwmac 5800a000.ethernet: User ID: 0x40, Synopsys ID: 0x42
[ 2.780299] stm32-dwmac 5800a000.ethernet: DWMAC4/5
[ 2.785190] stm32-dwmac 5800a000.ethernet: DMA HW capability register supported
[ 2.792527] stm32-dwmac 5800a000.ethernet: RX Checksum Offload Engine supported
[ 2.799835] stm32-dwmac 5800a000.ethernet: TX Checksum insertion supported
[ 2.806696] stm32-dwmac 5800a000.ethernet: Wake-Up On Lan supported
[ 2.812984] stm32-dwmac 5800a000.ethernet: TSO supported
[ 2.818278] stm32-dwmac 5800a000.ethernet: Enable RX Mitigation via HW Watchdog Timer
[ 2.826149] stm32-dwmac 5800a000.ethernet: device MAC address be:10:95:ec:a0:c7
[ 2.833449] stm32-dwmac 5800a000.ethernet: TSO feature enabled
[ 10.455282] stm32-dwmac 5800a000.ethernet eth0: no phy at addr -1
[ 10.475335] stm32-dwmac 5800a000.ethernet eth0: stmmac_open: Cannot attach to PHY (error: -19)

I have no experience changing ethernet ICs so I need your help.

​If necessary, I can attach the ethernet circuit diagram of my board.

​

Thanks​

[PatrickF]

Hi,

please have a look to AN5031 and https://wiki.st.com/stm32mpu/wiki/Ethernet_device_tree_configuration#DT_configuration_examples_at_board_level

Regards.

[SPark.15]

Thank you for your answer.

​In my case I think it's 3.3.1 from your link.

So I applied the line below to the dts file in my addons/mx/PROJECT/u-boot and kernel directory.

 ethernet0: ethernet@5800a000 {
 compatible = "st,stm32mp1-dwmac", "snps,dwmac-4.20a";
 reg = <0x5800a000 0x2000>;
 reg-names = "stmmaceth";
 interrupts-extended = <&intc GIC_SPI 61 IRQ_TYPE_LEVEL_HIGH>,
 <&intc GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>,
 <&exti 70 1>;
 interrupt-names = "macirq",
 "eth_wake_irq",
 "stm32_pwr_wakeup";
 clock-names = "stmmaceth",
 "mac-clk-tx",
 "mac-clk-rx",
 "ethstp";
 clock = <&rcc ETHMAC>,
 <&rcc ETHTX>,
 <&rcc ETHRX>,
 <&rcc ETHSTP>;
 st,syscon = <&syscfg 0x4>;
 snps,mixed-burst;
 snps,pbl = <2>; 
 snps,en-tx-lpi-clockgating;
 snps,axi-config = <&stmmac_axi_config_0>;
 snps,tso;
 power-domains = <&pd_core>;
 status = "disabled";
 }; 

After that, an error occurs when bitbake. Do I need to apply it to a file other than the one in that location?

[PatrickF]

Hi,

I'm more HW oriented, so I cannot help much on SW aspects.

Have you carefully followed the steps in https://wiki.st.com/stm32mpu/wiki/How_to_compile_the_device_tree_with_the_Developer_Package ?

This could also help:

https://wiki.st.com/stm32mpu/wiki/How_to_create_your_board_device_tree

https://wiki.st.com/stm32mpu/wiki/How_to_configure_U-Boot_for_your_board

Regards