Env Set up

$ export PATH=/opt/toolchain/2009-q1/bin:$PATH
$ export PATH=/opt/u-boot/tools:$PATH

$ sudo apt-get install xinetd tftpd tftp
$ sudo mkdir /home/test/tftpboot
$ sudo chmod -R 777 /home/test/tftpboot
$ sudo chown -R nobody /home/test/tftpboot

sudo cp uimage $tftproot

$ sudo vim /etc/xinetd.d/tftp

service tftp
{
        protocol = udp
        port = 69
        socket_type = dgram
        wait = yes
        user = nobody
        server = /usr/sbin/in.tftpd
        server_args = /home/test/tftpboot
        disable = no
}

sudo /etc/init.d/xinetd stop

sudo /etc/init.d/xinetd start

$ ifconfig > /home/renee/test/test.txt
$ tftp 127.0.0.1
tftp> get text.txt
Received 1445 bytes in 0.0 seconds
tftp> quit
$ ls
test.txt

dst="${HOME}/targetfs"
mkdir -p $dst

me='whoami'
#if exist the old filesystem, then sudo rm -rf $dst
sudo tar xzf xxx.tar.gz -C $dst

sudo chown $me:$me $dst
sudo chown -R $me:$me $dst/home $dst/usr $dst/etc $dst/lib $dst/opt $dst/boot

sudo chmod 666 /etc/exports
sudo echo "$dst *(rw,nohide,insecure,no_subtree_check,async,no_root_squash)" >> /etc/exports
sudo chmod 644 /etc/exports

sudo /etc/init.d/nfs-kernel-server stop

sudo /etc/init.d/nfs-kernel-server start