觉得楼上有位兄弟说的不错，要确认板子和LINUX机（无论是否有用到虚拟机）是互连的，既要能从LINUX机上ping 通开发板，又要能从开发板上ping通LINUX机！

网卡没有初始化
here: http://guotao.org/?p=47

引用第3楼8779586于2010-01-22 08:44发表的  :
首先，谢谢坛主的建议，昨晚回到家我也仔细发现了这个IP的确有些问题，因为不在同一个网段内，但是我有一点疑惑，为什么MINI2440的用户手册上要设置这么一个临时的IP（192.168.1.70），而不是板子上的固定IP(192.168.1.230).  

你这个应该就是IP段的问题
另外,之所以要设置临时IP,是因为你现在要通过NFS(网络文件系统),即把你LINUX系统中的ROOT_QTOPIA作为根文件系统.并不是启动你开发板上的根文件系统.192.168.1.230已经被开发板根文件系统占用了,所以你最好为NFS另设一个ip.

到底怎么解决的，就没有成功的么？我也遇到了这个问题，郁闷呀，，期待高手，谢苍天了

手册很多是错的，看多就知了，另外工作开始是也是从写说明书开始，就知道这些低水平企业编写说明书的乌龙。。

Enter your selection: b
Copy linux kernel from 0x00060000 to 0x30008000, size = 0x00500000 ... pos = 5242880, good pos = 560000
done
zImage magic = 0x016f2818
Setup linux parameters at 0x30000100
linux command line is: "console=ttyUSB0 root=/dev/nfs   nfsroot=192.168.1.100:/opt/enjoylinux/arm2440/root_qtopia ip=192.168.1.100:192.168.1.230:192.168.1.100:255.255.255.0:sbc2440:eth0:off"
MACH_TYPE = 1999
NOW, Booting Linux......
Uncompressing Linux.................................................................................................................................. done, booting the kernel.

为什么到这就停了，我很无奈，不知到什么原因，牛人救救我。

eth0: link down
IP-Config: Complete:
     device=eth0, addr=192.168.1.100, mask=255.255.255.0, gw=192.168.1.100,
     host=sbc2440, domain=, nis-domain=(none),
     bootserver=192.168.1.230, rootserver=192.168.1.100, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.100
eth0: link up, 100Mbps, full-duplex, lpa 0x4DE1
rpcbind: server 192.168.1.100 not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 192.168.1.100
rpcbind: server 192.168.1.100 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/enjoylinux/arm2440/root_qtopia
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:
[<c0035270>] (dump_backtrace+0x0/0x10c) from [<c033a844>] (dump_stack+0x18/0x1c)
r7:c39d30cb r6:c04920b0 r5:c39d3000 r4:c3823f40
[<c033a82c>] (dump_stack+0x0/0x1c) from [<c033a894>] (panic+0x4c/0x134)
[<c033a848>] (panic+0x0/0x134) from [<c0008e9c>] (mount_block_root+0x178/0x234)
r3:00000000 r2:c383db6c r1:c3823f40 r0:c03eab70
[<c0008d24>] (mount_block_root+0x0/0x234) from [<c0009008>] (mount_root+0xb0/0xf4)
[<c0008f58>] (mount_root+0x0/0xf4) from [<c0009144>] (prepare_namespace+0xf8/0x190)
r7:c0491a80 r6:c0021808 r5:c0021808 r4:c0021818
[<c000904c>] (prepare_namespace+0x0/0x190) from [<c00084c0>] (kernel_init+0xf0/0x124)
r7:00000000 r6:c001feac r5:c0020380 r4:c0020380
[<c00083d0>] (kernel_init+0x0/0x124) from [<c004d1a4>] (do_exit+0x0/0x62c)
r7:00000000 r6:00000000 r5:00000000 r4:00000000


牛人帮帮忙，我也想上吊啦。

楼上的现在问题解决了么？   我也碰到这问题了。  
难道是虚拟机要改成桥接？

楼主,你的NFS挂载问题解决了吗？？？

看来这个问题有很多人遇到过，有人问，但没有有解答！如果我解决了，我一定回贴！