The most common way to setup a system like the one described is through NFS. In such a way, you can quickly modify the root file system, even “on the fly” (meaning that the file system can be modified while the system is running). So the most convenient thing is to mount the whole root file system from the network, allowing the host system and the target to share the same files. Such a root file system can become very big in size, so it's hard to store it in flash memory. A good development root file system provides the developer with all the useful tools that can help him/her on his/her work. One of the most important components of a Linux system is the root file system. Please note that, beside atftpd, there are other software packages providing a tftp server, e.g. To change the tftp root directory, user should edit the /etc/default/atftpd file.
create the tftp root directory: sudo mkdir /tftpboot.edit the /etc/default/atftpd and change the USE_INETD to false.For example, run sudo apt-get install atftpd download the atftpd package with the preferred method.To change the tftp root directory, user should edit the /etc/xinetd.d/tftp file and modify the server_args option. restart xinetd: /etc/init.d/xinetd restart.assign the permission: chmod -R 777 /tftpboot and chown -R nobody /tftpboot.create the tftp root directory: mkdir /tftpboot.edit the configuration file /etc/xinetd.d/tftp and change the option disable from yes to no.if not included in the distribution, download the tftp package with the preferred method.Installation and configuration of a tftp server depends on the Linux distribution running on the host machine: U-Boot implements the a TFTP client (see the tftp command), so the host system must be configured to enable the TFTP service. This saves a lot of time because you don't have to flash the image in flash NOR every time you want to try a different one.
One of the most useful features of a bootloader during development is the capability to download the Linux kernel from the network. This section describes how to configure your host system for this purpose. Especially during the development phase, you would like to be able to have full control over the target system boot process.
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