Hello,
I am writing to point out that SDK 2014.1 has a bug when generating BSPs that include LwIP. To get ethernet working you need to edit one of you SDK 2014.1 config files as described here:
http://www.xilinx.com/support/answers/60358.html
Contrary to what that link suggests, this bug seems to pertain to all ethernet functionality (not just pings).
-Eric