以下设置怎么不行啊？
mini2440 # printenv
baudrate=115200
mtdids=nand0=nandflash0
mtdparts=mtdparts=nandflash0:256k@0(bootloader),64k(params),5m(kernel),-(root)
ethaddr=08:00:3e:26:0a:5b
bootcmd=tftpboot;bootm
partition=nand0,0
mtddevnum=0
mtddevname=bootloader
bootdelay=2
ipaddr=192.168.1.17
netmask=255.255.255.0
serverip=192.168.1.57
bootfile=uImage
bootargs=noinitrd root=/dev/nfs nfsroot=192.168.1.57:/work/nfs_root ip=192.168.1
.17:192.168.1.57:192.168.1.57:255.255.255.0:localhost:eth0ff init=/linuxrc con
sole=ttySAC0
stdin=serial
stdout=serial
stderr=serial
mini2440 # ping 192.168.1.57
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
host 192.168.1.57 is alive
mini2440 # tftp
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:5b
TFTP from server 192.168.1.57; our IP address is 192.168.1.17
Filename 'uImage'.
Load address: 0x31000000
Loading: T T T T T T T T T T
Retry count exceeded; starting again
TFTP from server 192.168.1.57; our IP address is 192.168.1.17
Filename 'uImage'.
Load address: 0x31000000
Loading: T T T T T T T T T T
其中，
(1) 192.168.1.57是Red Hat Linux的IP地址，Red Hat Linux安装在Windows XP的虚拟机VMware Workstation中；
(2) uImage放在Red Hat Linux的/work/nfs_root目录下；
(3) /etc/exports的内容如下：
/work/nfs_root *(rw,sync,no_root_squash)
(4) NFS、XINETD、PORTMAP、TFTP服务均已启动。
请大家指点一下，谢谢了！
