[U-Boot-Users] what's the function of 'load_addr' and 'BootFile' when downloading files with tftp?

[sun]

    I know  'BootFile' is the file name which will be downloaded on tftpserver, 'load_addr'  is the  address of 'BootFile'  downloaded. My question is how  tftp get the value of  'BootFile'  and 'load_addr'  and complete the download,
   
    
   
      a lots of thanks

       
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