topic S32K358 GMAC MAC address in S32K

S32K358 GMAC MAC address

Greavesinator85 — Thu, 27 Nov 2025 10:26:57 GMT

Hi,

I am working with the GMAC peripheral with LWIP. Using the config tool I see I must enter a MAC address to generate the configuration. Is there a hardware MAC address on the IC I can access? Or a range available to be used for evaluation purposes?

Re: S32K358 GMAC MAC address

PavelL — Thu, 27 Nov 2025 11:16:42 GMT

Hello @Greavesinator85 ,

no, there's no HW MAC address. Choose any MAC address which is unique in your network/subnet.

Best regards,

Pavel

Re: S32K358 GMAC MAC address

ivanperino — Thu, 27 Nov 2025 11:40:39 GMT

Pave,

your suggestion does not look like complying with IEEE. Assigning the same MAC address to two devices in same network (accidentaly or not) will cause a MAC spoofing that is ussually detected by layer 2 firewalls.

Our product cannot contain "any random" MAC address. With other products, we were given an OUI and a range to use. In one word. MAC address must be unique for physical devices (with the exception of virtual systems). Does NXP have a range or a way to avoid duplication?

I hope you can help us here.

Ivan

Re: S32K358 GMAC MAC address

PavelL — Thu, 27 Nov 2025 12:16:57 GMT

Hello @ivanperino ,

S32K3 devices (such as S32K358) do not have a MAC address burned into OTP memory. These MCUs do not include an integrated Ethernet PHY and do not provide a built-in unique MAC identifier.

MAC address management is the responsibility of each customer. NXP does not assign or guarantee MAC addresses for S32K3 devices. The assignment strategy (static, dynamic, or based on an officially registered OUI) must be defined and implemented by the customer.

Typical options:

Locally Administered Address (LAA) for internal or limited deployments (e.g., 02:xx:xx:xx:xx:xx).
Globally unique MAC address for commercial products, which requires registering an OUI with IEEE:
https://standards.ieee.org/products-services/regauth/

For reference, NXP does provide pre-programmed MAC addresses for certain wireless modules (BLE, Wi-Fi) where global uniqueness is mandatory for certification. This does not apply to S32K3 MCUs.

Best regards,

Pavel

Re: S32K358 GMAC MAC address

ivanperino — Thu, 27 Nov 2025 14:16:44 GMT

Thank you Pavel for the quick replay.

regards

Ivan