Ethernet is not functional on the ZCU102 RevB boards with the BSP that was delivered with Petalinux 2015.4. You will see messages similar to the following during boot up.
The work-arounds mentioned in this Answer Record are applicable to ZCU102 RevB boards only.
There are no changes required for Rev A ZCU102 boards.
A second option is to use a pre-generated ZCU102 BSP in the link below.
The updated ZCU102 BSP features the following:
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