Perhaps a related issue:
I just received an Arty-A7-100, and am trying to run the Avnet LwIP example working.
First issue is that their software repository (UG-AES-A7MB-7A35T-G-Arty_lwIP_EthernetLite_VIV2015_v1.pdf - page 32) does not work.
If I try to create a project as described (page 34) SDK aborts.
If I try to build a BSP using LwIP from that repository, the build fails.
Second issue is that if I use the Xilinx LwIP the initialization routine hangs.
Something is weird, perhaps marginal, that is stopping the Ethernet port from working. Or it could be that the IP needs to be configured specially for this board?
I'm using 2018.3 - per my client's specification.
Regards,
Gary.