To resolve this issue you will need to make the changes below.
The following file must be changed:
set ethernet_instance [get_property CONFIG.INSTANCE $emac]Should be changed to:
set ethernet_instance [get_property NAME $emac]
Upon regenerating the BSP, you will see a change in the file below:
<SDK Project>\<LwIP BSP>\ps7_cortexa9_0\libsrc\lwip140_v2_0\src\contrib\ports\xilinx\netif\xtopology_g.c
This resolves the problem and allows lwIP to respond to pings.
This issue is not specific to ZC702 and ZC706 - this will affect any Zynq lwIP design in Vivado 2014.1.
This issue will be resolved in the 2014.2 release.
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