title: How do I clear environment variables previously saved with u-boot?
body: <p>I am working with an embedded linux kit that is running u-boot.  In order to get everything booting properly, I had to modify some environment variables and store them with the 'saveenv' command.</p>
  
  <p>Now I would like to go back and see what the defaults were, verify that I know exactly what was changed, and figure out a way to change those defaults so that each unit in production won't need to be individually booted and modified.  </p>
  
  <p>Is there a way to tell u-boot to clear any saved data so I can see what the defaults are again?  The flash type is QSPI if that makes a difference.</p>