ref-manual: Updated "Build Image" section for do_image<type>[depends]

Added information about how the build system dynamically creates
do_image_* tasks (e.g. do_image_ext4[depends]) when creating the
image.  This is functionality that replaced IMAGE_DEPENDS_type.

(From yocto-docs rev: c977df506585aad1ade99c390bacc04b54eb0e48)

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

1 files changed, 16 insertions, 0 deletions

diff --git a/documentation/ref-manual/ref-development-environment.xml b/documentation/ref-manual/ref-development-environment.xml
index e590406706..13399016b1 100644
--- a/documentation/ref-manual/ref-development-environment.xml
+++ b/documentation/ref-manual/ref-development-environment.xml
@@ -2255,6 +2255,22 @@
             </para>
 
             <para>
+                As an example, a dynamically created task when creating a
+                particular image <replaceable>type</replaceable> would take the
+                following form:
+                <literallayout class='monospaced'>
+     do_image_<replaceable>type</replaceable>[depends]
+                </literallayout>
+                So, if the <replaceable>type</replaceable> as specified by the
+                <link linkend='var-IMAGE_FSTYPES'><filename>IMAGE_FSTYPES</filename></link>
+                were <filename>ext4</filename>, the dynamically generated task
+                would be as follows:
+                <literallayout class='monospaced'>
+     do_image_ext4[depends]
+                </literallayout>
+            </para>
+
+            <para>
                 The final task involved in image creation is the
                 <link linkend='ref-tasks-image-complete'><filename>do_image_complete</filename></link>
                 task.