dm9000 i/o: 0x88001000, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 01:12:23:34:45:56
operating at 100M full duplex mode
Using dm9000 device
TFTP from server 192.168.1.105; our IP address is 192.168.1.190
Filename 'tiny210-uboot.bin'.
Load address: 0x21000000
Loading: *
ARP Retry count exceeded; starting again
dm9000 i/o: 0x88001000, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 01:12:23:34:45:56
operating at 100M full duplex mode
当执行tftp下载命令时，打印出以下信息，是什么原因呢？请指点
------解决方案--------------------
有没有网络连接成功？是不是MAC冲突？