NFS启动根文件系统失败，log显示 nfs: server not responding

NXP IMX6ULL_PRO
1

按照 第三篇 6.6开发板使用NFS根文件系统
uboot设置：
uboot设置
=> setenv ipaddr 192.168.3.34
=> setenv serverip 192.168.3.51
=> ping 192.168.3.51
Using ethernet@020b4000 device
host 192.168.3.51 is alive

=> setenv nfsroot /home/book/nfs_rootfs
=> run netboot

kernel启动后 log显示ubuntu上的NFS server没有回应：
[ 4.860492] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 4.870033] Generic PHY 20b4000.ethernet-1:00: attached PHY driver [Generic PHY] (mii_bus:phy_addr=20b4000.ethernet-1:00, irq=-1)
[ 4.882393] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 6.935269] fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 6.954464] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 6.984634] Sending DHCP requests ., OK
[ 7.054275] IP-Config: Got DHCP answer from 192.168.3.1, my address is 192.168.3.34
[ 7.061982] IP-Config: Complete:
[ 7.065334] device=eth0, hwaddr=00:01:3f:2d:3e:4d, ipaddr=192.168.3.34, mask=255.255.255.0, gw=192.168.3.1
[ 7.075511] host=192.168.3.34, domain=, nis-domain=(none)
[ 7.081381] bootserver=0.0.0.0, rootserver=192.168.3.51, rootpath= nameserver0=192.168.3.1
[ 7.095652] ltemodule-pwr: disabling
[ 7.099292] wifi-pwr: disabling
[ 7.102466] ALSA device list:
[ 7.106091] #0: wm8960-audio
[ 7.151750] VFS: Mounted root (nfs filesystem) readonly on device 0:15.
[ 7.160543] devtmpfs: mounted
[ 7.166115] Freeing unused kernel memory: 1024K
Starting syslogd: OK
Starting klogd: OK
Running sysctl: OK
Starting 100ask lvgl: OK
[ 9.099312] ds18b20_drv_init OK.
[ 9.218258] dht11_drv_init OK.
[ 9.331739] irda_drv_init OK.
Populating /dev using udev: [ 9.668576] udevd[176]: starting version 3.2.9
[ 10.357301] udevd[177]: starting eudev-3.2.9
[ 11.737146] inv-mpu6000-spi spi2.0: mounting matrix not found: using identity…
[ 12.629001] 8723bu: loading out-of-tree module taints kernel.
[ 13.264729] usbcore: registered new interface driver rtl8723bu
done
Initializing random number generator: OK
Saving random seed: OK
Starting system message bus: done
Starting network: udhcpc: started, v1.31.1

[ 47.494423] random: crng init done
[ 64.534950] Bluetooth: hci0: Failed to load rtl_bt/rtl8723b_config.bin
[ 64.541567] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_fw.bin
[ 202.774482] nfs: server 192.168.3.51 not responding, still trying
[ 202.780904] nfs: server 192.168.3.51 not responding, still trying
[ 202.787850] nfs: server 192.168.3.51 not responding, still trying
[ 228.374429] nfs: server 192.168.3.51 not responding, still trying
[ 244.544408] nfs: server 192.168.3.51 not responding, still trying

Ubuntu上测试本地挂载可以的：
book@100ask:~$ sudo mount -t nfs -o nolock localhost:/home/book/nfs_rootfs /mnt
[sudo] password for book:
book@100ask:~$
book@100ask:~$ ls /mnt
01_old boot etc lib32 media opt root run selinux tmp var
bin dev lib linuxrc mnt proc rootfs.tar.bz2 sbin sys usr

请大佬帮忙看看问题出在哪儿？

2

实际上经过我的测试发现是因为文件系统在执行init.d 内的脚本时候，启动了udhcpc 服务， 因为你的ubuntu 根本就没有安装dhcp 服务器， 所以会导致它一直卡住， 在刚上电的时候，是可以发现， 其他一直都是卡在Starting network: udhcpc: started, v1.31.1 这个地方， 后面的打印是其他线程执行的。在交互界面上，按键在串口上输入实际上是有输出的， 代表串口这个模块是正常运行的。结合网上其他的资料。怀疑是网络的问题。
后面将文件系统中/home/book/nfs_rootfs/etc/init.d/S40network这个脚本放到上一级目录，重启启动网络根文件系统， 就发现是可以进行登录了。

复现问题：
在这个S40network脚本中， 实际上会执行/sbin/ifup -a 这个命令，发现执行的结果和我们开始遇到的问题是一样的。
[root@100ask:~]# /sbin/ifup -a
udhcpc: started, v1.31.1

输出的打印也是类似的。
证明了就是这个问题了。 因为我们没有DHCP 服务器， 所以导致开发板无法正常分配IP 地址。

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3

根据你说的修改，可以nfs正常启动了。