topic Re: Utilizing enet qos in Zephyr in i.MX Processors

Utilizing enet qos in Zephyr

jim4604 — Wed, 02 Jul 2025 10:20:42 GMT

I'm currently using an i.MX8MP running the Zephyr OS and want to utilize enet qos under this system. The externally connected PHY is a DP83630 using the RMII bus. The DP83630 acts as the master providing a 50MHz clock. The enet qos clock configuration is as follows:

CLOCK_DisableClock(kCLOCK_Enet_Qos);

CLOCK_SetRootMux(kCLOCK_RootEnetAxi, kCLOCK_EnetAxiRootmuxSysPll1Div3);
CLOCK_SetRootDivider(kCLOCK_RootEnetAxi, 1U, 1U);

CLOCK_SetRootMux(kCLOCK_RootEnetQos, kCLOCK_EnetQosRootmuxSysPll2Div20);
CLOCK_SetRootDivider(kCLOCK_RootEnetQos, 1U, 1U);

CLOCK_SetRootMux(kCLOCK_RootEnetQosTimer, kCLOCK_EnetQosTimerRootmuxSysPll2Div10);
CLOCK_SetRootDivider(kCLOCK_RootEnetQosTimer, 1U, 1U);

CLOCK_EnableClock(kCLOCK_Enet_Qos);
When initializing MDIO, the system hangs after calling the ENET_QOS_SetSMI(ENET_QOS_Type *base, uint32_t csrClock_Hz) function. Specifically, it hangs at the line:
base->MAC_MDIO_ADDRESS = ENET_QOS_MAC_MDIO_ADDRESS_CR(crDiv);

It appears that accessing the enet qos registers causes the system to hang. Could this issue be related to an error in the clock configuration?

Re: Utilizing enet qos in Zephyr

JosephAtNXP — Wed, 02 Jul 2025 16:48:59 GMT

Hi,

Thank you for your interest in NXP Semiconductor products,

In your setup, the best idea would be to probe the MDIO bus, confirm that you have the pull-up in MDIO line, probe that the timing of MDIO and MDC complies with MDIO specification, the PHY address is correct and that the PHY returns a message.

Regards

Re: Utilizing enet qos in Zephyr

jim4604 — Thu, 03 Jul 2025 01:15:53 GMT

I'm currently running a dual-system setup with Linux + RTOS. When I load the ENET QoS driver on the Linux side before launching Zephyr, the PHY ID can be read normally, which appears correct. However, if I don't load the driver in Linux, the system freezes.