UltraZed Ethernet MAC ID

Question

The UltraZed EG SOM documentation has the following note about the Ethernet MAC ID:

However, page 5 of the IO carrier card schematic shows the MAC ID - EEPROM, but does not explain how the ID is implemented.

Does the UltraZed SOM come with a unique MAC ID that can be used by the customer, or does the customer carrier card need to supply a unique MAC ID to the UltraZed SOM?

Thanks,

John

clem57 · Answer

Look at ZedBoard MAC Address | Zedboard .

The MAC address is defined within the kernel device tree on PetaLinux systems. This means, once you define it once for one board, it is the same for every other board that you load that PetaLinux build onto.

Here is the Xilinx official response for customers looking to assign MAC address across their boards:

https://www.xilinx.com/support/answers/53476.html

Hope that helps.

Clem

jdehaven · Answer

To clarify, the UltraZed SOM and Zynq UltraScale+ SoC on the SOM do not have a unique MAC address.

The Avnet IO Carrier Card for the UltraZed SOM has a Microchip EEPROM with a unique Ethernet MAC, and this Ethernet Mac is then used by the software running on the Zynq US+ to set the Ethernet MAC address(es) in the PS side of the SoC. In otherwords, putting an inexpensive MAC ID chip on the customer carrier board is an alternative to the procedure outlined in AR#53476, correct?

Thanks,

John

clem57 · Answer

Here is the skinny. Petalinux stores the MAC in the DTB. It will recognize a hardware MAC in early boot phase and warn a mismatch. Later you can resolve this with:

ZynqMP> setenv ethaddr xx:xx:xx:xx:xx:xx

ZynqMP> saveenv

This should save the environment and override DTB for the next boot.

REF: https://forums.xilinx.com/t5/Embedded-Boot-and-Configuration/ZCU102-Mac-Address/m-p/958079

Clem