title: Beaglebone Black: How to disable booting from a microSD?
body: <p>I need to prevent access to some files in eMMC. If I boot from uSD I can mount the eMMC and access the files, even if this files are protected with chmod 700 (where the owner is root). I thought several things to avoid this:</p>
  
  <ol>
  <li>Disable booting from the microSD.</li>
  <li>Encrypt somehow these files (it's a python API and some scripts in bash)</li>
  </ol>
  
  <p>I think the first option is the best, if possible to do, but I don't know how.</p>
  
  <p>After researching I saw that u-boot is used for booting, so I wonder if there is any way to configure it for disabling booting from micro SD.</p>