1. Connecting "directly" may not work - for direct board to PC connection without using ethernet switch you need specific "crossover" ethernet patch cord. If you do not have this patch cord than please try connecting through ethernet switch.
2. Ping from PC to U-boot in not supported by U-boot, the only ping from U-boot to PC is supported.
3. Please make sure you have disabled windows firewall or enabled ping rule in firewall.
4. Please do not forget to check "link" led for connection status before pinging.
I do not see anything incorrect in your attached file. In case if you are using our board and our BSP, than you do not need to make any changes in U-boot settings, standard prebuilt image should work.