topic Re: FRDM-MCXN947 Ethernet Issue in MCX Microcontrollers

FRDM-MCXN947 Ethernet Issue

WestCoastDaz — Wed, 04 Feb 2026 17:37:35 GMT

Hi NXP Community,

I just purchased 3 FRDM-MCXN947 dev kits for a company project and I can't get the Ethernet port to pass data on one of them. I am using Zephyr v4.3.0 and I have tested using the `http_server` sample. This works on the other two but I can't get DHCP or static IPs to work on the remaining on. The link lights are lit but it just times out trying to get a DHCP address and when static it's not routable. The device also doesn't show up as a client in our network management tools.

Thoughts on other tests I can run? Has this happened before?

Thanks in advance,

Daz

Re: FRDM-MCXN947 Ethernet Issue

Harry_Zhang — Thu, 05 Feb 2026 02:19:18 GMT

Hi @WestCoastDaz

May I ask if all three chips are the same? Has the board been reworked?

I think you can also test the SDK lwIP demos.

If lwIP also fails to get DHCP or cannot respond to ping, I think this may be a hardware issue.

Harry

Re: FRDM-MCXN947 Ethernet Issue

WestCoastDaz — Thu, 05 Feb 2026 22:20:37 GMT

Unfortunately I can't compare the chip versions as 2 of the DKs are being used in prototypes and I don't have access to them. The box on the non-working DK has a date code from 2429.

I don't have MCUXsspresso SDK installed only Zephyr is there another Zephyr example I could try?

Thanks,

Re: FRDM-MCXN947 Ethernet Issue

Harry_Zhang — Mon, 09 Feb 2026 02:13:55 GMT

Hi @WestCoastDaz

If you don't have MCUXsspresso SDK installed.

I think you can try to test the

samples/net/sockets/echo_server/

samples/net/dhcpv4_client

Harry