Continuous Error Messages on ENET2 with MIMXRT1061 (Ethernet Operational but Error Reports Persist: <err> eth_nxp_enet_mac: ENET_GetRxFrameSize return: 4001")

[ofirshe]

Hi,

I'm using a custom board with the MIMXRT1061DVJ6B microcontroller, where ENET2 is configured as the Ethernet controller. The network itself is operational and functioning correctly, but the RT1061 repeatedly reports the same error non-stop.

Below is the device tree configuration for ENET2:

pinmux_enet2: pinmux_enet2 {
		group0 {
			pinmux = <&iomuxc_gpio_emc_33_enet2_ref_clk2>;
			bias-disable;
			drive-strength = "r0-6";
			slew-rate = "fast";
			nxp,speed = "50-mhz";
			input-enable;
		};
		group1 {
			pinmux = <&iomuxc_gpio_emc_35_enet2_rx_data0>,
				<&iomuxc_gpio_emc_36_enet2_rx_data1>,
				<&iomuxc_gpio_emc_37_enet2_rx_en>,
				<&iomuxc_gpio_emc_34_enet2_rx_er>,
				<&iomuxc_gpio_emc_30_enet2_tx_data0>,
				<&iomuxc_gpio_emc_31_enet2_tx_data1>,
				<&iomuxc_gpio_emc_32_enet2_tx_en>;
			drive-strength = "r0-5";
			bias-pull-up;
			bias-pull-up-value = "100k";
			slew-rate = "fast";
			nxp,speed = "200-mhz";
		};
	};

&enet2_mac {
	status = "okay";
	pinctrl-0 = <&pinmux_enet2>;
	pinctrl-names = "default";
	phy-handle = <&phy>;
	phy-connection-type = "rmii";
	zephyr,random-mac-address;
};

&enet2_mdio {
	status = "okay";
	pinctrl-0 = <&pinmux_enet2_mdio>;
	pinctrl-names = "default";
	phy: phy@0 {
		compatible = "ethernet-phy";
		reg = <0>;
		status = "okay";
		fixed-link = "100BASE-T Full-Duplex";
	};
};

What could be causing the continuous error reports ?

Best Regards.

[ldomaigne]

There has been a similar bug reported here:
#66200

The issue at the end turned out to be a floating pin. Perhaps this applies here too?

[ofirshe]

Thanks, @ldomaigne. The issue was actually that our custom board uses a switch which provides the ref clock to the RT1061. So, I changed ENET2 to receive the clock, and now the issue is resolved.

IOMUXC_EnableMode(IOMUXC_GPR, kIOMUXC_GPR_ENET2RefClkMode, true);
IOMUXC_EnableMode(IOMUXC_GPR, kIOMUXC_GPR_ENET2TxClkOutputDir, false);