topic Random MAC Addresses with i.MX93 Linux in i.MX Processors

Random MAC Addresses with i.MX93 Linux

dpearson — Tue, 05 Aug 2025 22:33:28 GMT

In our development/automated test environment we assign fixed IP Addresses based on the target hardware MAC address. Unfortunately I've just discovered that the i.MX93 FRDM boards are randomizing their MAC addresses with each boot.

Is there a way to configure the board to come up with a consistent MAC Address on every boot?

Tagging @david_dicarlo for visibility.

Re: Random MAC Addresses with i.MX93 Linux

xiaocong_fu — Wed, 06 Aug 2025 01:39:42 GMT

In u-boot. You can use

$setenv ethaddr xx:xx:xx:xx:xx:xx

$saveenv

Re: Random MAC Addresses with i.MX93 Linux

danielchen — Wed, 06 Aug 2025 02:09:29 GMT

Hi @dpearson :

Just add xiaochong's good comments, the other option to set FRDM-IMX93 with fixed MAC address is to program i.MX93 Fusemap BankNum 39 word 3, word 4, and word 5. i.MX93 Fusemap located at reference manual attachments named <i.MX93_Fusemap.xlsx>.

Regards

Daniel