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network problem in DM6467

We  download UBL and uboot into Flash , and boot is OK

 We ping TFTP server, it  responses.

However,  we find that we cannot download uImage but we can download   small files(e.g.200bytes) successfully.

The detail information is

SEED-VPM6467# printenv
bootdelay=3
baudrate=115200
addclk=setenv bootargs ${bootargs} clkref=${clkref}
ethact=DaVinci EMAC
maskaddr=255.255.255.0
gateway=192.168.0.1
ipaddr=192.168.0.30
autostart=no
filesize=211FB4
bootcmd=tftp
DaVinci=EMAC
gthaddr=00:0C:29:94:D7:D6
bootfile=uImage
bootargs=console=ttyS0,115200n8 noinitrd rw ip=192.168.0.109 root=/dev/nfs nfsro
ot=192.168.0.109:/opt/nfs,nolock mem=76M
serverip=192.168.0.109
ethaddr=00:0C:29:94:D7:D6
stdin=serial
stdout=serial
stderr=serial
ver=U-Boot 2009.08 (Dec 06 2012 - 05:39:09)

SEED-VPM6467# tftp 0x80800000 uImage;bootm 0x80800000
Using DaVinci EMAC device
TFTP from server 192.168.0.109; our IP address is 192.168.0.30
Filename 'uImage'.
Load address: 0x80800000
Loading: *
ps:PDF is the connection between 6467 and net chip.