TQ210以nfs起根文件系统出现错误

准备以nfs作为根文件系统启动遇到如下错误提示：S5PC1XX TVOUT Driver, (c) 2009 Samsung Electronics
s5p-tvout s5p-tvout: hpd status is cable removed
dm9000 dm9000: eth0: link down
ADDRCONF(NETDEV_UP): eth0: link is not ready
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
dm9000 dm9000: eth0: link up, 100Mbps, full-duplex, lpa 0x4DE1
IP-Config: Complete:
     device=eth0, addr=192.168.1.6, mask=255.255.255.0, gw=192.168.1.6,
     host=www, domain=, nis-domain=embedsky.com,
     bootserver=192.168.1.105, rootserver=192.168.1.105, rootpath=
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00            2048 mtdblock0  (driver?)
1f01            3072 mtdblock1  (driver?)
1f02            5120 mtdblock2  (driver?)
1f03          514048 mtdblock3  (driver?)
b300         7563264 mmcblk0  driver: mmcblk
  b301         7527862 mmcblk0p1 00000000-0000-0000-0000-000000000000mmcblk0p1
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
eth0: no IPv6 routers present


u-boot中的环境变量如下：

bootcmd=nand read.jffs2 0xc0008000 kernel;bootm 0xc0008000
bootdelay=0                                               
baudrate=115200
ethaddr=00:40:5c:26:0a:5b
ipaddr=192.168.1.6      
netmask=255.255.255.0
lcdtype=X800Y480     
bootargs_defaults=setenv bootargs ${bootargs} lcd=${lcdtype}
bootloaderimgname=u-boot.bin                                
logoimgname=logo.bin        
nkimgname=NK.bin   
kernelimgname=zImage.bin
rootimgname=root.bin   
mtdids=nand0=s5pv210-nand
gatewayip=192.168.1.1   
mtdparts=mtdparts=s5pv210-nand:1m@0(bios),1m(params),3m(logo),6m(kernel),-(root)
nfsserverip=192.168.1.105                                                      
nfsipaddr=192.168.1.6   
nfsnetmask=255.255.255.0
nfs_dir=/home/han/rootfs
bootargs=noinitrd init=/init console=ttySAC0 root=/dev/nfs rootwait=1 nfsroot=192.168.1.105:/home/han/rootfs ip=192.168.1.6:192.168.1.105:192.168.1.6:255.255.255.0:www.embedsky.com:eth0:off
serverip=192.168.1.105
stdin=serial         
stdout=serial
stderr=serial
partition=nand0,0
mtddevnum=0      
mtddevname=bios






求帮助