为了在播放机上实现NFS服务器的功能，我们已经在uClibc中打开了完整RPC支持，并且在新编译的内核中打开了NFS服务器支持。此外还有两个软件包也是提供NFS服务所必需的：
portmap和
nfs-utils。portmap为RPC程序提供端口映射服务，nfs-utils则是使用内核NFS服务器的支持程序。
编译portmap
1. 下载portmap_5beta:
ftp://ftp.porcupine.org/pub/security/portmap_5beta.tar.gz2. 打这个补丁:
portmap_5beta.patch.zip （补丁来自buildroot-2009.11，我只是把多个补丁合并成一个）
3. $
make CC=mipsel-linux-gcc4.
$ mipsel-linux-strip portmap编译nfs-utils
1. 下载nfs-utils-1.1.1: http://nchc.dl.sourceforge.net/project/nfs/nfs-utils/1.1.1/nfs-utils-1.1.1.tar.gz
2. 打这个补丁:
nfs-utils-1.1.1-uclibc.patch.zip （在网上找到的，来源记不清了，我稍加了修改）
3. 运行配置脚本：
1 ./configure --build=i686-linux --host=mipsel-linux --disable-nfsv4 --disable-gss --disable-uuid --disable-mount --without-tcp-wrappers --with-gnu-ld CC=mipsel-linux-gcc CPP=mipsel-linux-cpp AR=mipsel-linux-ar STRIP=mipsel-linux-strip RANLIB=mipsel-linux-ranlib LD=mipsel-linux-ld
4.
$ make5. 安装到/home/user/dist/nfs-utils目录
1 $ make DESTDIR=/home/user/dist/nfs-utils install-strip
在制作固件时，我们只需要几个编译好的程序：
portmap, rpc.statd, rpc.nfsd, rpc.mountd, exportfs。其中
portmap 放到
/sbin下，其余的放到
/usr/sbin下。
此外还需要一个NFS服务启动脚本S60nfs，放在/etc/init.d目录下。下载脚本
S60nfs.zip (来自buildroot，我把portmap的启动加进去了）
1 #!/bin/sh
2 #
3 # nfs This shell script takes care of starting and stopping
4 # the NFS services. Stolen from RedHat FC5.
5
6 [ -x /sbin/portmap ] || exit 0
7 [ -x /usr/sbin/rpc.statd ] || exit 0
8 [ -x /usr/sbin/rpc.nfsd ] || exit 0
9 [ -x /usr/sbin/rpc.mountd ] || exit 0
10 [ -x /usr/sbin/exportfs ] || exit 0
11
12 # Don't fail if /etc/exports doesn't exist; create a bare-bones version and continue.
13 [ -r /etc/exports ] || \
14 { touch /etc/exports && chmod u+rw,g+r,o+r /etc/exports ; } || \
15 { echo "/etc/exports does not exist" ; exit 0 ; }
16
17 # The /var/lib/nfs directory is actually on a tmpfs filesystem.
18 mkdir -p /var/lib/nfs/sm
19 mkdir -p /var/lib/nfs/sm.bak
20 touch /var/lib/nfs/etab
21 touch /var/lib/nfs/rmtab
22 touch /var/lib/nfs/state
23 touch /var/lib/nfs/xtab
24
25 start() {
26 # Start daemons.
27 echo -n "Starting port mapper: "
28 portmap
29 echo "done"
30
31 echo -n "Starting NFS statd: "
32 rpc.statd
33 touch /var/lock/subsys/nfslock
34 echo "done"
35
36 echo -n "Starting NFS services: "
37 /usr/sbin/exportfs -r
38 rpc.statd
39 echo "done"
40
41 echo -n "Starting NFS daemon: "
42 rpc.nfsd 2
43 echo "done"
44
45 echo -n "Starting NFS mountd: "
46 rpc.mountd
47 echo "done"
48 touch /var/lock/subsys/nfs
49 }
50
51 stop() {
52 # Stop daemons.
53 echo -n "Shutting down NFS mountd: "
54 killall -q rpc.mountd
55 echo "done"
56
57 echo "Shutting down NFS daemon: "
58 kill -9 `pidof nfsd` 2>/dev/null
59 echo "done"
60
61 echo -n "Shutting down NFS services: "
62 /usr/sbin/exportfs -au
63 rm -f /var/lock/subsys/nfs
64 killall -q rpc.statd
65 echo "done"
66
67 echo -n "Stopping NFS statd: "
68 killall -q rpc.statd
69 echo "done"
70 rm -f /var/lock/subsys/nfslock
71
72 echo -n "Stopping port mapper: "
73 killall -q portmap
74 echo "done"
75 }
76
77 # See how we were called.
78 case "$1" in
79 start)
80 start
81 ;;
82 stop)
83 stop
84 ;;
85 restart)
86 stop
87 start
88 ;;
89 reload)
90 /usr/sbin/exportfs -r
91 touch /var/lock/subsys/nfs
92 ;;
93 *)
94 echo "Usage: nfs {start|stop|reload}"
95 exit 1
96 esac
97
98 exit 0