AM4379裸机TCPECHO例程执行失败

唐唐123

创龙工程师：请教个问题。我拿的创龙的AM4379-EVM开发板跑的给的TCPECHO例程，执行到DCHP时，提示DCHP未完成。现象如图。具体会有哪些原因导致这个问题？

StarterWare TCP Echo Application!!
BOARDInit status [0x0]
SoC                   : [AM43XX]
Core                  : [A9]

Acquiring IP Address for Port 1...
PHY found at address 4.
Gigabit Full duplex is not supported!!!.
Performing Auto-Negotiation...
Auto-Negotiation Successful.
Transfer Mode : 1000 Mbps Full Duplex.
PHY link verified for Port 1 of Instance 0.
DHCP Trial 1...
DHCP Trial 2...
DHCP Trial 3...
DHCP Trial 4...
DHCP Trial 5...
Unable to complete DHCP!

Port 1 IP Address Acquisition Failed