Mention full memor dumps, minidumps, and textdumps in the introduction

to kernel debugging, with consequences for debugging.

Mention that the default in more recent FreeBSD versions is to
automatically select a swap partition and use it as a dump partition,
and don't suggest changing the default.

This chapter could use rather serious updating.

en_US.ISO8859-1/books/developers-handbook/kerneldebug/chapter.sgml

@@ -53,14 +53,16 @@
       <quote>swap device</quote> is synonymous with a <quote>swap
       partition.</quote></para></note>
 
-    <para>To be able to extract a usable core, it is required that at
+    <para>Several types of kernel crash dumps are available: full memory
-      least one swap partition be large enough to hold all of the bits
+      dumps, which hold the complete contents of physical memory,
-      in physical memory.  When a kernel panics, before the system
+      minidumps, which hold only memory pages in use by the kernel
-      reboots, the kernel is smart enough to check to see if a swap
+      (&os;&nbsp; 6.2 and higher), and textdumps, which hold captured
-      device has been configured as a dump device.  If there is a
+      scripted or interactive debugger output (&os;&nbsp;8.0 and higher).
-      valid dump device, the kernel dumps the contents of what is in
+      Minidumps are the default dump type as of &os;&nbsp;7.0, and in most
-      physical memory to the swap device.</para>
+      cases will capture all necessary information present in a full
-
+      memory dump, as most problems can be isolated only using kernel
+      state.</para>
+      
     <sect2 id="config-dumpdev">
       <title>Configuring the Dump Device</title>
 
@@ -72,7 +74,10 @@
 	has been configured with &man.swapon.8;.  This is normally
 	handled by setting the <varname>dumpdev</varname> variable in
 	&man.rc.conf.5; to the path of the swap device (the
-	recommended way to extract a kernel dump).</para>
+	recommended way to extract a kernel dump) or
+	<filename>AUTO</filename> to use the first configured swap
+	device.  <filename>AUTO</filename> is the default as of
+	&os;&nbsp;6.0.</para>
 
       <para>Alternatively, the dump device can be hard-coded via the
 	<literal>dump</literal> clause in the &man.config.5; line of
@@ -140,10 +145,6 @@
       space for the dump.  Also, do not forget to specify the correct path to your swap
       device as it is likely different than
       <filename>/dev/ad0s1b</filename>!</para></tip>
-
-      <para>The recommended, and certainly the easiest way to automate
-        obtaining crash dumps is to use the <varname>dumpdev</varname>
-        variable in &man.rc.conf.5;.</para>
     </sect2>
   </sect1>