title: issue accessing /dev/mem and /dev/kmem
body: <p>I am having Android 2.3.7 (Cyanogen mod), the 2 nodes /dev/mem and /dev/kmem do not exist on my device.
  I have tried the following two commands to create the nodes:</p>
  
  <pre><code># mknod /dev/mem c 1 1
  # chown root.mem /dev/mem
  
  # mknod /dev/kmem c 1 2
  # chown root.kmem /dev/kmem
  </code></pre>
  
  <p>but I get the error: <code>chown: unknown user/group root:mem</code></p>
  
  <p>It seems like I can create the nodes, but I cannot bind them with the mem and kmem.
  Please give me some suggestion.
  Thanks</p>