ref-manual: Updated the DISTRO_FEATURES description of Bluez5

Edits to explain that by default, DISTRO_FEATURES backfills
bluetooth support with Bluez5.  If the user wants to use the
Bluez4 feature, they need to backfill consider Bluez5.

(From yocto-docs rev: 4e8b34c8c5841cdc1cae564decae4689ae4f2b11)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 19 insertions, 1 deletions

diff --git a/documentation/ref-manual/ref-features.xml b/documentation/ref-manual/ref-features.xml
index 267dea9568..cd1bcb0243 100644
--- a/documentation/ref-manual/ref-features.xml
+++ b/documentation/ref-manual/ref-features.xml
@@ -146,7 +146,25 @@
                     bluetooth support (integrated BT only).</para></listitem>
                 <listitem><para><emphasis>bluez5:</emphasis> Include
                     BlueZ Version 5, which provides core Bluetooth layers and
-                    protocols support.</para></listitem>
+                    protocols support.
+                    <note>
+                        The default value for the
+                        <link linkend='var-DISTRO_FEATURES'><filename>DISTRO FEATURES</filename></link>
+                        variable includes "bluetooth", which causes bluez5
+                        to be backfilled in for bluetooth support.
+                        If you do not want bluez5 backfilled and would rather
+                        use bluez4, you need to use the
+                        <link linkend='var-DISTRO_FEATURES_BACKFILL_CONSIDERED'><filename>DISTRO_FEATURES_BACKFILL_CONSIDERED</filename></link>
+                        variable as follows:
+                        <literallayout class='monospaced'>
+     DISTRO_FEATURES_BACKFILL_CONSIDERED = "bluez5"
+                        </literallayout>
+                        Setting this variable tells the OpenEmbedded build
+                        system that you have considered but ruled
+                        out using the bluez5 feature and that bluez4 will be
+                        used.
+                    </note>
+                    </para></listitem>
                 <listitem><para><emphasis>cramfs:</emphasis> Include CramFS
                     support.</para></listitem>
                 <listitem><para><emphasis>directfb:</emphasis>