Update the instructions for loading wifi drivers on FreeBSD versions

with or without devmatch. Mention that loading of drivers in
loader.conf or via rc.conf may be required for certain versions. It
should be done in order to have the lagg interface properly set up
at boot time.

Thanks to Pau Amma for providing the patch.
While here, fix some overly long lines in the note above.

PR:             246506 (documentation part)
Submitted by:   pauamma_gundo.com
Requested by:   cperciva (on IRC)
Reviewed by:    cperciva, bcr
Approved by:    bcr
Differential Revision:  https://reviews.freebsd.org/D25881

1 files changed, 21 insertions, 5 deletions

diff --git a/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml b/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
index 7f35bae92a..0c433aeab5 100644
--- a/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
+++ b/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
@@ -3732,11 +3732,27 @@ ifconfig_<literal>lagg<replaceable>0</replaceable></literal>="laggproto failover
 	  interface.</para>
 
 	<note>
-	  <para>In theory, either the Ethernet or wireless MAC address can
-	    be changed to match the other.  However, some popular wireless
-	    interfaces lack support for overriding the MAC address.  We
-	    therefore recommend overriding the Ethernet MAC address for this
-	    purpose.</para>
+	  <para>In theory, either the Ethernet or wireless MAC address
+	    can be changed to match the other.  However, some popular
+	    wireless interfaces lack support for overriding the MAC
+	    address.  We therefore recommend overriding the Ethernet
+	    MAC address for this purpose.</para>
+	</note>
+
+	<note>
+	  <para>If the driver for the wireless interface is not loaded
+	    in the <literal>GENERIC</literal> or custom kernel,
+	    and the computer is running &os;&nbsp;&rel121.current;,
+	    load the corresponding <filename>.ko</filename> in
+	    <filename>/boot/loader.conf</filename> by adding
+	    <userinput><replaceable>driver</replaceable>_load="YES"</userinput>
+	    to that file and rebooting.  Another, better way is to
+	    load the driver in <filename>/etc/rc.conf</filename> by
+	    adding it to <varname>kld_list</varname> (see
+	    &man.rc.conf.5; for details) in that file and rebooting.
+	    This is needed because otherwise the driver is not loaded
+	    yet at the time the &man.lagg.4; interface is set
+	    up.</para>
 	</note>
 
 	<para>In this example, the Ethernet interface,