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之前解决了"mount.nfs:access denied by server while mounting"今早终于成功从NFS启动，所以跟踪此贴，补充下从NFS启动的过程First配置NFS,并在本地测试环境 ubuntu 10.04 vm 7.1终端ifconfig 得到 ubuntu资料INET ADDR 192.168.0.3BCAST 192.168.0.255MASK 255.255.255.0一 安装NFS$ sudo apt-get install nfs-kernel-server$ sudo apt-get install nfs-common二 配置NFS1 $ sudo dpkg-reconfigure portmap , 对Should portmap be bound to the loopback address? 选N2 $ sudo vi /etc/default/portmap 末行清除 "-i 127.0.0.1"三 配置hosts.deny $ sudo vi /etc/hosts.deny 文本末添加### NFS DAEMONS portmap: ALL lockd: ALL mountd: ALL rquotad: ALL statd: ALL四 配置hosts.allow $ sudo vi /etc/hosts.allow 文本末加入### NFS DAEMONS portmap: 192.168.0. lockd: 192.168.0. rquotad: 192.168.0. mountd: 192.168.0. statd: 192.168.0.$ sudo /etc/init.d/portmap restart 重启portmap daemon.显示如下Since the script you are attempting to invoke has been converted to anUpstart job, you may also use the restart(8) utility, e.g. restart portmapportmap start/running, process XXXX五 配置/etc/exports$ sudo vi /etc/exports文本末添加/home/work *(rw,sync,no_root_squash)chmod 777 -R /home/work$ sudo showmount -e显示 clnt-create : RPC : Program not registered$ sudo exportfs -r 更新$ sudo showmount 192.168.0.3 -e显示Export list for 192.168.0.3:/home/work *六 启用 $ sudo /etc/init.d/nfs-kernel-server restart 重启nfs服务显示如下* Stopping NFS kernel daemon [ OK ]* Unexporting directories for NFS kernel daemon... [ OK ]* Exporting directories for NFS kernel daemon... exportfs: /etc/exports [1]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/home/work". Assuming default behaviour ('no_subtree_check'). NOTE: this default has changed since nfs-utils version 1.0.x* Starting NFS kernel daemon [ OK ]挂载 mount -t nfs 192.168.0.3:/home/work /nfsmnt mount -t nfs 192.168.0.3:/home/work /nfsmnt -o nolock不出现警告即成功挂载 ，$sudo ls /nfsmnt . 看到与/home/work中的内容一样.SECOND从NFS启动系统我配置NFS的目的是为了方便调试程序.把程序下到板子里测试.$sudo umount /nfsmnt$sudo cd /home$sudo mkdir nfsroot$sudo cd nfsroot$sudo cp -a /home/cheung/works/nfsroot/* ./(前路径是我用BUSYBOX制作的文件系统 ,在这里,我把它都移到/home/nfsroot,方便以后使用)(但并不建议像我这样复制，很多情况是不行的，还是直接在NFSROOT里做系统）至于文件系统这里不赘述了,我也是个菜鸟,就自己学着做了个.$sudo chmod 777 -R /home/nfsroot更改NFS配置$sudo vi /etc/exports把FIRST中的/home/work改成/home/nfsroot$sudo exportfs -r 更新$sudo /etc/init.d/portmap restart$sudo /etc/init.d/nfs-kernel-server restart接下来,打开win下的secureCRT或者minicom在开机或者复位时迅速按下enter , 进入uboot控制台，以下是我的开机参数"U-Boot 2009.11-rc2 (Jun 11 2010 - 15:39:57)DRAM: 64 MBFlash: 2 MBNAND: 128 MiBIn: serialOut: serialErr: serialNet: dm9000dm9000 i/o: 0x30000000, id: 0x90000a46DM9000: running in 16 bit modeMAC: 12:34:56:78:90:12operating at 10M full duplex modeHit any key to stop autoboot: 0NewMsg9261> printbootargs=console=ttyS0,57600 root=/dev/mtdblock0 rw rootfstype=jffs2 init=/linuxrcbootcmd=nand read 0x22000000 0xA0000 0x200000; bootmbootdelay=3baudrate=57600ethact=dm9000ethaddr=12:34:56:78:90:12ipaddr=192.168.0.5serverip=192.168.0.2Environment size: 243/131067 byte"先把nand flash中原有的jffs2删除掉<newmsg9261> nand erase 0x300000(这里是我之前存放jffs2文件系统的地址）设置启动参数bootargs<newmsg9261> setenv bootargs console=ttyS0,57600 root=/dev/nfs rw mem=128M nfsroot=192.168.0.3:/home/nfsroot ip=192.168.0.5:192.168.0.3:192.168.0.1:255.255.255.0:newmsg9261:eth0: off（在minicom中可能不会自动换行 , 那就按ctrl+A,然后w, ok)这里解释一下参数"nfsroot=" 后面是我NFS主机的IP地址和我的文件系统的路径, 上面说过"ip="后面一 目标板IP 192.168.0.5（我的启动参数里print给大家了,就是ipaddr）二 主机IP 192.168.0.3三 目标板网关 192.168.0.1四 子网掩码 255.255.255.0五 开发板名字（随你便）六 eth0(网卡设备名称）<newmsg9261>sa （保存设置）<newmsg9261>boot 启动以下是我启动成功的图片
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