1，portmap配置失敗原因答案
Ubuntu上默認是沒有安裝NFS服務器的，首先要安裝NFS服務程序：
$ sudo apt-get installnfs-kernel-server
(安裝nfs-kernel-server時，apt會自動安裝nfs-common和 rpcbind（注意，選取這里是 rpcbind 而非portmap））這樣，宿主機就相當于NFSServer。
（1）配置/etc/hosts.deny（禁止任何host（主機）能和你的NFS服務器進行NFS連接)，加入：
### NFS DAEMONS
rpcbind:ALL
lockd:ALL
mountd:ALL
rquotad:ALL
statd:ALL
（2）配 置/etc/hosts.allow
允許那些你想要的主機和你的NFS服務器建立連接。下列步驟將允許任何IP地址以192.168.0開頭的主機（連接到NFS服務器上），也可以指定特定的IP地址。加入：
### NFS DAEMONS
rpcbind: 192.168.0.
lockd: 192.168.0.
rquotad: 192.168.0.
mountd: 192.168.0.
statd: 192.168.0.
（3） 配置/etc/exports
NFS掛載目錄及權限由/etc/exports文件定義
比如我要將將我的usr目錄中的/usr/local目錄讓192.168.0.*的IP共享,則在該文件末尾添加下列語句：
/usr/local192.168.0.*(rw,sync,no_root_squash)
或者： /usr/local192.168.197.0/24(rw,sync,no_root_squash)
192.168.0.* 網段內的NFS客戶端能夠共享NFS服務器/usr/local目錄內容.且有讀,寫權限,并且該用戶進入/usr/local目錄后的身份為root，最好加上sync, 否則 $ sudo exportfs-r 時會給出警告,sync是NFS的默認選項.
(運行$ showmount-e 查看NFSserver的exportlist.
若更改了/etc/exports, 運行 $ sudo exportfs-r 更新
運行 $ sudo/etc/init.d/nfs-kernel-server restart 重啟nfs服務)
后續實驗記錄：
root@camel-dynabook-SS-1700MY-106S-2:~# mount -t nfs -o nolock 192.168.1.116:/home/camel/Mini2440-NFS /mnt
root@camel-dynabook-SS-1700MY-106S-2:~# cd /mnt
root@camel-dynabook-SS-1700MY-106S-2:/mnt# ls
bin etc lib mnt proc sbin sys usr www
dev home linuxrc opt root share tmp var
mini2440寫入參數：
console=ttySAC0
root=/dev/nfs
nfsroot=192.168.1.116:/home/camel/Mini2440-NFS
ip=192.168.1.70:192.168.1.111:192.168.1.111:255.255.255.0:sbc2440.arm9.net:eth0:off
nand啟動mini2440串口輸出：
IP-Config: Complete:
device=eth0, addr=192.168.1.70, mask=255.255.255.0, gw=192.168.1.111,
host=sbc2440, domain=, nis-domain=arm9.net,
bootserver=192.168.1.111, rootserver=192.168.1.116, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.116
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
rpcbind: server 192.168.1.116 not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 192.168.1.116
rpcbind: server 192.168.1.116 not responding, timed out
Root-NFS: Unable to get mountd port number from server, using default
Root-NFS: Server returned error -5 while mounting /home/camel/Mini2440-NFS
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 mtdblock0one_wire_status: 4
(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)
one_wire_status: 4
Backtrace:
[<c00341cc>] (dump_backtrace+0x0/0x10c) from [<c0329f3c>] (dump_stack+0x18/0x1c)
r7:c03dba08 r6:00008000 r5:c3923000 r4:c0481c90
[<c0329f24>] (dump_stack+0x0/0x1c) from [<c0329f8c>] (panic+0x4c/0x114)
one_wire_status: 4
[<c0329f40>] (panic+0x0/0x114) from [<c0008dbc>] (mount_block_root+0x174/0x228)
r3:c38583ec r2:00000000 r1:c3823f60 r0:c03db9a0
[<c0008c48>] (mount_block_root+0x0/0x228) from [<c0008f34>] (mount_root+0xc4/0xfc)
[<c0008e70>] (mount_root+0x0/0xfc) from [<c0009094>] (prepare_namespace+0x128/0x180)
r5:c002081d r4:c0481660
[<c0008f6c>] (prepare_namespace+0x0/0x180) from [<c00084b0>] (kernel_init+0xe0/0x114)
r5:c001f2e4 r4:c0481420
[<c00083d0>] (kernel_init+0x0/0x114) from [<c004bbbc>] (do_exit+0x0/0x620)
r5:00000000 r4:00000000
one_wire_status: 4
還有錯誤，革命尚未成功，同志仍需努力。
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