title: what does "usb start" command do exactly?
body: <p>I am facing a problem when i try to read from usb device at u-boot.</p>
  
  <p>When i do </p>
  
  <pre><code>      fatls usb 0:1 
  </code></pre>
  
  <p>it says bad device. But as soon as i do </p>
  
  <pre><code>      usb start
        fatls usb 0:1
  </code></pre>
  
  <p>then it shows me correcly the fat partition in USB.</p>
  
  <p>I was looking to add both commands in the common/main.c so that whenever the board boots it looks for the fat partition of USB.</p>
  
  <p>It is tough but i need to do it.</p>
  
  <p>Anybody has a clue??  </p>