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dev-manual: Updates to using IMAGE_FEATURES and EXTRA_IMAGE_FEATURES 

The section "Customizing Images Using Custom IMAGE_FEATURES
and EXTRA_IMAGE_FEATURES" needed a bit more clarification on
the image features.  The text pretty much passed off image
features as all mapping into package groups, which is not true.
Some, like "debug-tweaks for example, are more like general
configurations.  I updated the section accordingly.

Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
(From yocto-docs rev: 7dd55ff0bd6f7923e22695ed7323df5cfe17d1d4)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark 2015-01-14 16:27:20 -08:00 committed by Richard Purdie
parent a0e84189ee
commit 63750d8c11
1 changed files with 11 additions and 2 deletions
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13
documentation/dev-manual/dev-manual-common-tasks.xml
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@ -996,11 +996,20 @@
<para>
To understand how these features work, the best reference is
<filename>meta/classes/core-image.bbclass</filename>.
This class lists out the available
<ulink url='&YOCTO_DOCS_REF_URL;#var-IMAGE_FEATURES'><filename>IMAGE_FEATURES</filename></ulink>
of which most map to package groups while some, such as
<filename>debug-tweaks</filename> and
<filename>read-only-rootfs</filename>, resolve as general
configuration settings.
</para>
<para>
In summary, the file looks at the contents of the
<filename>IMAGE_FEATURES</filename> variable and then maps
those contents into a set of package groups.
or configures the feature accordingly.
Based on this information, the build system automatically
adds the appropriate packages to the
adds the appropriate packages or configurations to the
<ulink url='&YOCTO_DOCS_REF_URL;#var-IMAGE_INSTALL'><filename>IMAGE_INSTALL</filename></ulink>
variable.
Effectively, you are enabling extra features by extending the