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tftp failed in the DM6467 .

my chip is DM6467.

I tftp  uImage (in the DAVINCI board) is working.

but I tftp uImage in myself board isn't working.

I run myself board,and input print.

it desplay:

DM6467 EVM > print
bootargs=mem=76M console=ttyS0,115200n8 root=/dev/hda1 rw ip=off vpif_display.ch
2_numbuffers=0 vpif_display.ch3_numbuffers=0
bootdelay=3
baudrate=115200
addclk=setenv bootargs ${bootargs} clkref=${clkref}
ethact=DaVinci EMAC
bootcmd=nand read 81100000 560000 500000; nboot 80700000 0 160000; bootm
serverip=192.168.11.191
ipaddr=192.168.11.119
bootfile=uImage-dm6467
ethaddr=00:50:c2:1e:af:fb
stdin=serial
stdout=serial
stderr=serial
ver=U-Boot 2009.08 (Apr 13 2010 - 10:03:49)

Environment size: 478/16380 bytes

my PC IP is 192.168.11.191.

so I continus input:

DM6467 EVM > setenv bootfile uImage-dm6467
DM6467 EVM > tftp 0x80700000 uImage-dm6467
Using DaVinci EMAC device
TFTP from server 192.168.11.191; our IP address is 192.168.11.119
Filename 'uImage-dm6467'.
Load address: 0x80700000
Loading: T T T T T T T T T T T T T T T T T T T T
Retry count exceeded; starting again
Using DaVinci EMAC device
TFTP from server 192.168.11.191; our IP address is 192.168.11.119
Filename 'uImage-dm6467'.
Load address: 0x80700000
Loading: T T T T T T T T T T T T T T T T T T T T
Retry count exceeded; starting again
Using DaVinci EMAC device
TFTP from server 192.168.11.191; our IP address is 192.168.11.119
Filename 'uImage-dm6467'.

I cann't understand why?

note:myself board's PHY chip is same to the DAVINCI.