Following is the procedure which will guide you for setting up the Linux PC as a tftp client. We are using Ubuntu as tftp client to demonestrate tftp client usecase, normally Ubuntu is used as tftp server and your embedded target is used as tftp client, so same below commands will also work on embedded target tftp client.
Setting up TFTP server ( This commands are also mentioned in our another post “How to setup tftp server on Ubuntu ?”
sudo apt-get install tftpd-hpa
sudo apt-get install tftp
sudo service tftpd-hpa start
Above steps will install tftp server, creates directory /srv/tftp on Ubuntu 20.04 and start the tftp server, which you can check using below command,
$ ps -ax | grep tftp 32850 ? Ss 0:00 /usr/sbin/in.tftpd --listen --user tftp --address :69 --secure /srv/tftp
On other Ubuntu versions, you may see tftp server started with directory /var/lib/tftpboot
One we have setup, tftpserver now we will need to copy images which we want to flash on the target.
$ sudo cp -r FOLDER_WITH_FILES/* /var/lib/tftpboot
Using TFTP Client
Once you have the TFTP server setup, for this example, we will assume the IP address of Ubuntu machine where you setup TFTP server is 192.168.0.100
Note: since below command download or upload from current working directory, make sure you “cd” to that respectivie directory where you want to download the files from tftp server or where your files which you want to upload to tftp server are present.
$ cd YOUR_WORKSPACE_DIRECTORY
Connect to TFTP server using below command,
$ tftp YOUR_TFTP_SERVER_IP
for example, $ tftp 192.168.0.100 will connect your tftp client to your tftp server.
Once you connected to tftp server, you will get a tftp prompt as,
You can press question make to check the supported commands,
tftp> ? Commands may be abbreviated. Commands are: connect connect to remote tftp mode set file transfer mode put send file get receive file quit exit tftp verbose toggle verbose mode trace toggle packet tracing status show current status binary set mode to octet ascii set mode to netascii rexmt set per-packet retransmission timeout timeout set total retransmission timeout ? print help information
Now, we must know in advance what are the filenames of the files exists in tftp server, which you want to download . So, suppose we want to download helloworld.txt file from tftp server, then we can use get command as,
Set the verbose mode ON for our understanding by typing “verbose” command on tftp console.
tftp> verbose Verbose mode on.
Now, use “get” command to download “helloworld.txt”
tftp> get helloworld.txt getting from 192.168.0.100:helloworld.txt to helloworld.txt [netascii] Received 25700 bytes in 0.1 seconds [2056000 bits/sec]