can't use "ifconfig"

HI all :

my chip is dm8168;

ezsdk  version is ezsdk_dm816x-evm_5_05_02_00;

my problem is:

I can't use shell cmd  " ifconfig  eth 192.168.1.111", after I input it ,my console held without any print.

see log:

 _____                    _____           _         _   
|  _  |___ ___ ___ ___   |  _  |___ ___  |_|___ ___| |_
|     |  _| .'| . | . |  |   __|  _| . | | | -_|  _|  _|
|__|__|_| |__,|_  |___|  |__|  |_| |___|_| |___|___|_|  
              |___|                    |___|            

Arago Project http://arago-project.org dm816x-evm ttyO2

Arago 2011.09 dm816x-evm ttyO2

dm816x-evm login: root
root@dm816x-evm:~# ifconfig  
eth0      Link encap:Ethernet  HWaddr 7C:66:9D:42:ED:8E  
          inet addr:192.168.1.89  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::7e66:9dff:fe42:ed8e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10133 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8408 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:7924068 (7.5 MiB)  TX bytes:1249466 (1.1 MiB)
          Interrupt:40 Base address:0x8000

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

root@dm816x-evm:~# ifconfig eth0 192.168.1.111

console held here without any ptint, anyone else got this question?

does  the hardware  cause this?

any  suggestion will be appreciate!

thanks!

BR