IMX8MP RGMII Connection with No PHY

RyanMKB — Wed, 03 Dec 2025 23:24:46 GMT

Hi,

I'm trying to setup an ethernet RGMII connection to a switch without using a PHY. Based on other posts I've configured my device tree as follows:

&fec { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_fec>, <&pinctrl_fec_phy>; phy-mode = "rgmii"; status = "okay"; fixed-link { speed = <1000>; full-duplex; }; }; pinctrl_fec: fecgrp { fsl,pins = <MX8MP_IOMUXC_SAI1_RXD2__ENET1_MDC 0x40000044>, <MX8MP_IOMUXC_SAI1_RXD3__ENET1_MDIO 0x40000044>, <MX8MP_IOMUXC_SAI1_RXD4__ENET1_RGMII_RD0 0x90>, <MX8MP_IOMUXC_SAI1_RXD5__ENET1_RGMII_RD1 0x90>, <MX8MP_IOMUXC_SAI1_RXD6__ENET1_RGMII_RD2 0x90>, <MX8MP_IOMUXC_SAI1_RXD7__ENET1_RGMII_RD3 0x90>, <MX8MP_IOMUXC_SAI1_TXC__ENET1_RGMII_RXC 0x90>, <MX8MP_IOMUXC_SAI1_TXFS__ENET1_RGMII_RX_CTL 0x90>, <MX8MP_IOMUXC_SAI1_TXD0__ENET1_RGMII_TD0 0x12>, <MX8MP_IOMUXC_SAI1_TXD1__ENET1_RGMII_TD1 0x12>, <MX8MP_IOMUXC_SAI1_TXD2__ENET1_RGMII_TD2 0x12>, <MX8MP_IOMUXC_SAI1_TXD3__ENET1_RGMII_TD3 0x12>, <MX8MP_IOMUXC_SAI1_TXD4__ENET1_RGMII_TX_CTL 0x12>, <MX8MP_IOMUXC_SAI1_TXD5__ENET1_RGMII_TXC 0x14>; }; pinctrl_fec_phy: fecphygrp { fsl,pins = <MX8MP_IOMUXC_SAI1_RXFS__GPIO4_IO00 0x100>, <MX8MP_IOMUXC_SAI1_RXC__GPIO4_IO01 0x1c0>; };

ethtool shows Link detected: yes, and ifconfig shows that an ip address was assigned. However I am unable to ping to or from the board. Can you confirm if the pins are set correctly for this use case? Thanks.

Re: IMX8MP RGMII Connection with No PHY

joanxie — Thu, 04 Dec 2025 10:36:38 GMT

pls refer to the enclosed file, which is very useful for your case

Re: IMX8MP RGMII Connection with No PHY

RyanMKB — Thu, 04 Dec 2025 15:55:32 GMT

Thank you for your reply, I have looked at that document already which helped me get this far. However, I still need further assistance in getting things working.

Re: IMX8MP RGMII Connection with No PHY

joanxie — Sat, 06 Dec 2025 06:50:49 GMT

for RGMII, the current bsp supports this as default, you can refer to that

https://github.com/nxp-imx/linux-imx/blob/lf-6.12.y/arch/arm64/boot/dts/freescale/imx8mp-evk.dts#L390

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