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| 1 | <html> | ||
| 2 | <head> | ||
| 3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> | ||
| 4 | <title>Chapter 9. Reference: Features</title> | ||
| 5 | <link rel="stylesheet" type="text/css" href="../book.css"> | ||
| 6 | <meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> | ||
| 7 | <link rel="home" href="index.html" title="The Yocto Project Reference Manual"> | ||
| 8 | <link rel="up" href="index.html" title="The Yocto Project Reference Manual"> | ||
| 9 | <link rel="prev" href="ref-images.html" title="Chapter 8. Images"> | ||
| 10 | <link rel="next" href="ref-features-distro.html" title="9.1. Distro"> | ||
| 11 | </head> | ||
| 12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="chapter" title="Chapter 9. Reference: Features"> | ||
| 13 | <div class="titlepage"><div><div><h2 class="title"> | ||
| 14 | <a name="ref-features"></a>Chapter 9. Reference: Features</h2></div></div></div> | ||
| 15 | <div class="toc"> | ||
| 16 | <p><b>Table of Contents</b></p> | ||
| 17 | <dl> | ||
| 18 | <dt><span class="section"><a href="ref-features-distro.html">9.1. Distro</a></span></dt> | ||
| 19 | <dt><span class="section"><a href="ref-features-machine.html">9.2. Machine</a></span></dt> | ||
| 20 | <dt><span class="section"><a href="ref-features-image.html">9.3. Images</a></span></dt> | ||
| 21 | <dt><span class="section"><a href="ref-features-backfill.html">9.4. Feature Backfilling</a></span></dt> | ||
| 22 | </dl> | ||
| 23 | </div> | ||
| 24 | <p> | ||
| 25 | Features provide a mechanism for working out which packages | ||
| 26 | should be included in the generated images. | ||
| 27 | Distributions can select which features they want to support through the | ||
| 28 | <code class="filename"><a class="link" href="ref-variables-glos.html#var-DISTRO_FEATURES" title="DISTRO_FEATURES">DISTRO_FEATURES</a></code> | ||
| 29 | variable, which is set in the <code class="filename">poky.conf</code> distribution configuration file. | ||
| 30 | Machine features are set in the | ||
| 31 | <code class="filename"><a class="link" href="ref-variables-glos.html#var-MACHINE_FEATURES" title="MACHINE_FEATURES">MACHINE_FEATURES</a></code> | ||
| 32 | variable, which is set in the machine configuration file and | ||
| 33 | specifies the hardware features for a given machine. | ||
| 34 | </p> | ||
| 35 | <p> | ||
| 36 | These two variables combine to work out which kernel modules, | ||
| 37 | utilities, and other packages to include. | ||
| 38 | A given distribution can support a selected subset of features so some machine features might not | ||
| 39 | be included if the distribution itself does not support them. | ||
| 40 | </p> | ||
| 41 | <p> | ||
| 42 | One method you can use to determine which recipes are checking to see if a | ||
| 43 | particular feature is contained or not is to <code class="filename">grep</code> through | ||
| 44 | the metadata for the feature. | ||
| 45 | Here is an example that discovers the recipes whose build is potentially | ||
| 46 | changed based on a given feature: | ||
| 47 | </p> | ||
| 48 | <pre class="literallayout"> | ||
| 49 | $ cd $HOME/poky | ||
| 50 | $ git grep 'contains.*MACHINE_FEATURES.*<feature>' | ||
| 51 | </pre> | ||
| 52 | <p> | ||
| 53 | </p> | ||
| 54 | <p> | ||
| 55 | This chapter provides a reference of shipped machine and distro features | ||
| 56 | you can include as part of the image, a reference on image types you can | ||
| 57 | build, and a reference on feature backfilling. | ||
| 58 | </p> | ||
| 59 | </div></body> | ||
| 60 | </html> | ||