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dead booting the kernel

DaVinci EVM # printenv
bootdelay=3
baudrate=115200
bootfile=uImage
rootpath=/home/we1314love/workdir/filesys
stdin=serial
stdout=serial
stderr=serial
ethaddr=00:0e:99:02:57:3c
videostd=ntsc
bootcmd=setenv setboot setenv bootargs \$(bootargs) davinci_enc_mngr.ch0_mode=\$(videostd);run setboot;nboot 0x80700000 0 0x400000;bootm
setboot=setenv bootargs $(bootargs) davinci_enc_mngr.ch0_mode=$(videostd)
filesize=181ac
fileaddr=80700000
ipaddr=192.168.1.101
serverip=192.168.1.125
bootargs=mem=116M console=ttyS0,115200n8 root=/dev/nfs rw nfsroot=192.168.1.125:/home/we1314love/workdir/filesys ip=192.168.1.101:192.168.1.1:255.255.255.0 video=davincifb:vid0=720x576x16,2500K:vid1=720x576x16,2500K:osd0=720x576x16,2025K davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=ntsc
nfshost=192.168.1.125

Environment size: 784/65532 bytes
DaVinci EVM # tftp 0x80700000 uImage
TFTP from server 192.168.1.125; our IP address is 192.168.1.101
Filename 'uImage'.
Load address: 0x80700000
Loading: #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #####
done
Bytes transferred = 2018344 (1ecc28 hex)
DaVinci EVM # boot
Unknown command 'nboot' - try 'help'
## Booting image at 80700000 ...
   Image Name:   Linux-2.6.18_pro500-davinci_evm-
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2018280 Bytes =  1.9 MB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
OK

Starting kernel ...

Uncompressing Linux..................................................................................................................................... done, booting the kernel.

how  can i solve the problem?