Add kernel configureation introduction.

Add an <important> note as an introduction to configuring the kernel.

chapter10/kernel.xml

@@ -45,6 +45,37 @@
     in the kernel source tree for alternative methods to the way this book
     configures the kernel.</para>
 
+    <important>
+      <para>
+        Building the linux kernel for the first time is one of the most
+        challenging tasks in LFS.  Getting it right depends on the specific
+        hardware for the target system and your specific needs. There are
+        almost 12,000 configuration items that are available for the kernel
+        although only about a third of them are needed for most computers. The
+        LFS editors recommend that users not familiar with this process follow
+        the procedures below fairly closely.  The objective is to get an
+        initial system to a point where you can log in at the command line when
+        you reboot later in <xref linkend="ch-finish-reboot"/>.  At his point
+        optimization and customization is not a goal.
+      </para>
+
+      
+      <para>
+        For general information on kernel configuration see <ulink
+        url="&hints-root;kernel-configuration.txt"/>.  Additional information
+        about configuring and building the kernel can be found at <ulink
+        url="http://www.kroah.com/lkn/"/>. These refereces are a bit
+        dated, but still give a reasonable overview of the process.
+      </para>
+
+      <para>
+        If all else fails, you can ask for help on the <ulink
+        url="https://www.linuxfromscratch.org/mail.html">lfs-suport</ulink>
+        mailing list.  Note that suscribing is required in order for the list
+        to avoid spam.
+      </para>
+    </important>
+
     <para>Prepare for compilation by running the following command:</para>
 
 <screen><userinput remap="pre">make mrproper</userinput></screen>
@@ -88,10 +119,6 @@
 
     <!-- Support for compiling a keymap into the kernel is deliberately removed -->
 
-    <para>For general information on kernel configuration see <ulink
-    url="&hints-root;kernel-configuration.txt"/>.  Additional
-    information about configuring and building the kernel can be found at
-    <ulink url="http://www.kroah.com/lkn/"/>.</para>
 
     <note>
       <para>A good starting place for setting up the kernel configuration is to