bootdelay=3                                                                    
baudrate=115200                                                                
ethaddr=00:40:5c:26:0a:5b                                                      
filesize=1f04ec                                                                
fileaddr=50008000                                                              
gatewayip=192.168.1.1                                                          
netmask=255.255.255.0                                                          
bootcmd=tftp 50008000 uImage;bootm 50008000                                    
ipaddr=192.168.1.10                                                            
serverip=192.168.1.110                                                         
bootargs=root=/dev/nfs nfsroot=192.168.1.110:/nfsboot/qt_root ip=192.168.1.10 0 ????????
stdin=serial                                                                   
stdout=serial                                                                  
stderr=serial     


#set bootargs root=/dev/nfs nfsroot=2.2.2.18:/nfsboot/qt_root ip=2.2.2.10 in    it=/linuxrc console=ttySAC0,115200
我这样设置了，但是上面改不了，什么原因

什么叫改不了，save后是保存在flash中的，保存不了可能是bootloader有问题，flash坏了 ==
flash引脚接触不好，可能会变成只读，曾经遇到过。