大四了，以后想从事嵌入式的工作，因之前没做过相关项目，学校教的和没教一样，只能去借了块mini2440自己做做。课题是将qt4上实现的俄罗斯方块移植到开发板上。
        每天都开出来弄弄，终于摸爬滚打到了用nfs启动linux的这一步，没想到这一步却把我卡住了。具体情况如下：
        我是在vmware下的ubuntu13.10上搭的环境。qt版本是4.8.5.
        在supervivi下输入boot后，开发板跳出企鹅界面，但是运行了一会不动了。在终端上查了下，报出了这样一段提示：
Looking up port of RPC 100003/2 on 192.168.130.128                              
eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1                                
rpcbind: server 192.168.130.128 not responding, timed out                      
Root-NFS: Unable to get nfsd port number from server, using default            
Looking up port of RPC 100005/1 on 192.168.130.128                              
rpcbind: server 192.168.130.128 not responding, timed out                      
Root-NFS: Unable to get mountd port number from server, using default          
Root-NFS: Server returned error -5 while mounting /opt/FriendlyARM/mini2440/roo4
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             256 mtdblock0 (driver?)                                        
1f01             128 mtdblock1 (driver?)                                        
1f02            5120 mtdblock2 (driver?)                                        
1f03          256640 mtdblock3 (driver?)                                        
1f04          262144 mtdblock4 (driver?)                                        
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)  
Backtrace:                                                                      
[<c00341cc>] (dump_backtrace+0x0/0x10c) from [<c03297d0>] (dump_stack+0x18/0x1c)
r7:c03db108 r6:00008000 r5:c3923000 r4:c0481b10                                
[<c03297b8>] (dump_stack+0x0/0x1c) from [<c0329820>] (panic+0x4c/0x114)        
[<c03297d4>] (panic+0x0/0x114) from [<c0008dbc>] (mount_block_root+0x174/0x228)
r3:c38599ec r2:00000000 r1:c3823f60 r0:c03db0a0                                
[<c0008c48>] (mount_block_root+0x0/0x228) from [<c0008f34>] (mount_root+0xc4/0x)
[<c0008e70>] (mount_root+0x0/0xfc) from [<c0009094>] (prepare_namespace+0x128/0)
r5:c002081d r4:c04814e0                                                        
[<c0008f6c>] (prepare_namespace+0x0/0x180) from [<c00084b0>] (kernel_init+0xe0/)
r5:c001f180 r4:c04812a0                                                        
[<c00083d0>] (kernel_init+0x0/0x114) from [<c004bbbc>] (do_exit+0x0/0x620)      
r5:00000000 r4:00000000    
        有没知道这问题或者处理过的。求指点。    

可能nfs没有搭建好，推荐直接烧写文件系统到板子中使用

谢谢回复。
上网查了很多也说是没搭建好。。但排查好像很麻烦。放弃这种方法有种不甘心的感觉。。
话说我也刚玩这板子不久。直接烧写的操作是先清空进入nand模式烧写么。这样开发板的目录在哪找？

已解决。
        感谢这篇帖子 http://www.aiothome.net/read.php?tid-11723.html    
        经验证nfs可以挂载本机后确定是网络设置问题。重新设置一次虚拟机和开发板的ip地址，子网掩码，网关后搞定。需要注意的是一些细节：
   1. 虚拟机设置——网络适配器   网络连接选桥接，复选框要勾上。
   2.虚拟网络编辑器    单机VMnet0   在VMnet信息栏里选桥接，要选桥接到自己的网卡，我这选的是JMicron PCIExpress Gigabit Ethernet Adapter。
   3.虚拟机防火墙，主机防火墙，360，杀du软件，qq安全管家这些都要关闭。
   希望后面碰上这种问题的别像我一样纠结这么久了。。