I210 MAC address programming issue

[AWang31]

hi,

Recently I met a curious issue about I210 MAC address programming.

The EEPROM image is offline programmed with default MAC address (00:A0:C9:00:00:00).

And the MAC address can be changed only once online with eeupdate64e.efi tool.

I want to know where is the problem. Does anyone meet?

[CarlosAM_INTEL]

Hello, erichh:

Thank you for contacting Intel Embedded Community.

The information that may help you is the answers to the questions 2.25 and 2.23, on page 9 of the https://www.intel.com/content/dam/www/public/us/en/documents/faqs/ethernet-controller-i210-i211-faq.pdf Intel(R) Ethernet Controller I210/I211 Frequently Asked Questions (FAQs) document # 335346.

We hope that this information may help you.

Best regards,

Carlos_A.

[AWang31 · Accepted solution]

hi Carlos_A,

Thanks a lot for your hint, while I'm still confused.

I use I210 with an external flash memory. And after I update the MAC address, I'll power down and power on the product.

For the pin12 the document mentioned, I tried the pull-up or pull-down scheme.

I can't figure out why the MAC address can only be changed once. Certainly, after reprograming the flash offline, the MAC address can be changed once online again.