title: ARM Asynchronous external abort
body: <p>I am programming a bare-metal application on a Cortex-A9 and I am frequently getting Data Abort Exceptions. When I look for the reason for this exception in the Data Fault Status Register (DFSR) of CP15, the value of the Fault Status bits (FS) is b10110. I looked at the specification and b10110 means "Asynchronous external abort". What does this mean? I can't find any useful information about this kind of abort. </p>
  
  <p>For example I also get Alignment faults sometimes, but I know what this means and so I can track down those kinds of faults comparatively easy. But I don't know how to handle asynchronous external aborts, since I don't know what they mean or why they occur. Thanks for your help. </p>