新手求助：NFS加载根文件系统时失败，帮忙看看一下

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我在学到14.3讲，移植根文件系统的时候出了问题，开发板没办法通过NFS挂载Ubunto下的文件，
uboot和linux已经通过网络启动成功了，卡在了加载根文件那里了。
bootargs和bootcmd设置如下：
=> printenv bootargs
bootargs=console=ttymxc0,115200 root=/dev/nfs rw nfsroot=192.168.2.150:/home/li/linux/nfs/rootfs ip=192.168.2.151:192.168.2.150:192.168.2.1:255.255.255.0::eth0ff
=> printenv bootcmd
bootcmd=tftp 80800000 zImage;tftp 83000000 imx6ull-alientek-emmc.dtb;bootz 80800000 - 83000000
nfs安装和设定按照教程搞好了。帮忙看一下哪里出了问题。
<出问题时的信息如下>
fec 20b4000.ethernet eth0: Freescale FEC PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=20b4000.ethernet:01, irq=-1)
IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
mmc0: new ultra high speed SDR25 SDHC card at address 1388
mmcblk0: mmc0:1388 NCard 7.32 GiB
mmcblk0: p1
hub 1-1:1.0: USB hub found
hub 1-1:1.0: 4 ports detected
mmc1: MAN_BKOPS_EN bit is not set
mmc1: new HS200 MMC card at address 0001
mmcblk1: mmc1:0001 8GTF4R 7.28 GiB
mmcblk1boot0: mmc1:0001 8GTF4R partition 1 4.00 MiB
mmcblk1boot1: mmc1:0001 8GTF4R partition 2 4.00 MiB
mmcblk1rpmb: mmc1:0001 8GTF4R partition 3 512 KiB
mmcblk1: p1 p2
usb 1-1.1: new high-speed USB device number 3 using ci_hdrc
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
IP-Config: Complete:
     device=eth0, hwaddr=00:04:9f:04:d2:35, ipaddr=192.168.2.151, mask=255.255.255.0, gw=192.168.2.1
     host=192.168.2.151, domain=, nis-domain=(none)
     bootserver=192.168.2.150, rootserver=192.168.2.150, rootpath=
can-3v3: disabling
ALSA device list:
  No soundcards found.
fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx

casy99

fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Down
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx

casy99

fec 20b4000.ethernet eth0: Link is Up - 10Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
fec 20b4000.ethernet eth0: Link is Up - 10Mbps/Full - flow control rx/tx

casy99

我今天也遇到了同样的问题，哎！