用tftp下载，可以ping 通，就是下载不了出现以下情况
OpenJTAG> ping 192.168.1.3
ERROR: resetting DM9000 -> not responding
dm9000 i/o: 0x20000000, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
could not establish link
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
host 192.168.1.3 is alive
OpenJTAG> tftp 3000000 lcd.bin
ERROR: resetting DM9000 -> not responding
dm9000 i/o: 0x20000000, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
could not establish link
TFTP from server 192.168.1.1; our IP address is 192.168.1.11
Filename 'lcd.bin'.
Load address: 0x3000000
Loading: checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
T T T T T T T T T T
Retry count exceeded; starting again
TFTP from server 192.168.1.1; our IP address is 192.168.1.11
Filename 'lcd.bin'.
Load address: 0x3000000
Loading: T T T T T T T T T T
Retry count exceeded; starting again
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