Add some details about how to install Intel microcode updates.

Approved by:	bcr

en_US.ISO8859-1/books/faq/book.xml

@@ -2231,6 +2231,25 @@
 	    <para>&man.smp.4; has more details.</para>
 	  </answer>
 	</qandaentry>
+
+	<qandaentry>
+	  <question>
+	    <para>What is microcode?
+	      How do I install &intel; CPU microcode updates?</para>
+	  </question>
+
+	  <answer>
+	    <para>Microcode is a method of programmatically
+	      implementating hardware level instructions.  This allows
+	      for CPU bugs to be fixed without replacing the on board chip.</para>
+
+	    <para>
+	      Install <filename role="package">sysutils/devcpu-data</filename>,
+	      then add:</para>
+	    <programlisting>microcode_update_enable="YES"</programlisting>
+	    <para>to <filename>/etc/rc.conf</filename></para>
+	  </answer>
+	</qandaentry>
       </qandaset>
     </sect1>