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  21
  22 <h2 class="titleHead">opendreambox</h2>
  23 <div class="author" ><span
  24 class="cmr-12">Andreas Oberritter </span><span
  25 class="cmtt-9">&#x003C;obi@opendreambox.org&#x003E;</span></div>
  26 <br />
  27 <div class="date" ><span
  28 class="cmr-12">May 2012</span></div>
  29 </div>
  30 <h3 class="likesectionHead"><a
  31  id="x1-1000"></a>Contents</h3>
  32 <div class="tableofcontents">
  33 <span class="sectionToc" >1 <a
  34 href="#x1-20001" id="QQ2-1-2">Introduction</a></span>
  35 <br />&#x00A0;<span class="subsectionToc" >1.1 <a
  36 href="#x1-30001.1" id="QQ2-1-3">Target audience</a></span>
  37 <br />&#x00A0;<span class="subsectionToc" >1.2 <a
  38 href="#x1-40001.2" id="QQ2-1-4">Supported products</a></span>
  39 <br />&#x00A0;<span class="subsectionToc" >1.3 <a
  40 href="#x1-50001.3" id="QQ2-1-5">License</a></span>
  41 <br />&#x00A0;<span class="subsectionToc" >1.4 <a
  42 href="#x1-60001.4" id="QQ2-1-6">Obtaining the source code</a></span>
  43 <br />&#x00A0;<span class="subsectionToc" >1.5 <a
  44 href="#x1-70001.5" id="QQ2-1-7">Quick start</a></span>
  45 <br />&#x00A0;<span class="subsectionToc" >1.6 <a
  46 href="#x1-80001.6" id="QQ2-1-8">Directory structure</a></span>
  47 <br />&#x00A0;&#x00A0;<span class="subsubsectionToc" >1.6.1 <a
  48 href="#x1-90001.6.1" id="QQ2-1-9">openembedded-core and meta-openembedded</a></span>
  49 <br />&#x00A0;&#x00A0;<span class="subsubsectionToc" >1.6.2 <a
  50 href="#x1-100001.6.2" id="QQ2-1-10">meta-opendreambox</a></span>
  51 <br />&#x00A0;&#x00A0;<span class="subsubsectionToc" >1.6.3 <a
  52 href="#x1-110001.6.3" id="QQ2-1-11">meta-bsp</a></span>
  53 <br /><span class="sectionToc" >2 <a
  54 href="#x1-120002" id="QQ2-1-12">Prerequisites</a></span>
  55 <br />&#x00A0;<span class="subsectionToc" >2.1 <a
  56 href="#x1-130002.1" id="QQ2-1-13">Required software</a></span>
  57 <br /><span class="sectionToc" >3 <a
  58 href="#x1-140003" id="QQ2-1-14">Major changes since previous releases</a></span>
  59 <br />&#x00A0;<span class="subsectionToc" >3.1 <a
  60 href="#x1-150003.1" id="QQ2-1-15">Changes since release 1.6</a></span>
  61 <br /><span class="sectionToc" >4 <a
  62 href="#x1-160004" id="QQ2-1-16">Known Issues</a></span>
  63 <br /><span class="sectionToc" >5 <a
  64 href="#x1-170005" id="QQ2-1-17">Building OpenDreambox</a></span>
  65 <br />&#x00A0;<span class="subsectionToc" >5.1 <a
  66 href="#x1-180005.1" id="QQ2-1-18">Makefile targets</a></span>
  67
  68
  69
  70 <br />&#x00A0;<span class="subsectionToc" >5.2 <a
  71 href="#x1-190005.2" id="QQ2-1-19">Configuration variables</a></span>
  72 <br />&#x00A0;&#x00A0;<span class="subsubsectionToc" >5.2.1 <a
  73 href="#x1-200005.2.1" id="QQ2-1-20">BB_NUMBER_THREADS</a></span>
  74 <br />&#x00A0;&#x00A0;<span class="subsubsectionToc" >5.2.2 <a
  75 href="#x1-210005.2.2" id="QQ2-1-21">MACHINE</a></span>
  76 <br />&#x00A0;&#x00A0;<span class="subsubsectionToc" >5.2.3 <a
  77 href="#x1-220005.2.3" id="QQ2-1-22">PARALLEL_MAKE</a></span>
  78 <br />&#x00A0;<span class="subsectionToc" >5.3 <a
  79 href="#x1-230005.3" id="QQ2-1-23">Adding custom layers</a></span>
  80 <br />&#x00A0;<span class="subsectionToc" >5.4 <a
  81 href="#x1-240005.4" id="QQ2-1-24">Adding custom options</a></span>
  82 <br />&#x00A0;&#x00A0;<span class="subsubsectionToc" >5.4.1 <a
  83 href="#x1-250005.4.1" id="QQ2-1-25">DISTRO_FEED_PREFIX</a></span>
  84 <br />&#x00A0;&#x00A0;<span class="subsubsectionToc" >5.4.2 <a
  85 href="#x1-260005.4.2" id="QQ2-1-26">DISTRO_FEED_URI</a></span>
  86 <br />&#x00A0;&#x00A0;<span class="subsubsectionToc" >5.4.3 <a
  87 href="#x1-270005.4.3" id="QQ2-1-27">INHERIT</a></span>
  88 <br />&#x00A0;<span class="subsectionToc" >5.5 <a
  89 href="#x1-280005.5" id="QQ2-1-28">Setting up a build directory</a></span>
  90 <br />&#x00A0;<span class="subsectionToc" >5.6 <a
  91 href="#x1-290005.6" id="QQ2-1-29">Building a firmware image</a></span>
  92 <br />&#x00A0;<span class="subsectionToc" >5.7 <a
  93 href="#x1-300005.7" id="QQ2-1-30">Building a package</a></span>
  94 <br /><span class="sectionToc" >6 <a
  95 href="#x1-310006" id="QQ2-1-31">Development hints</a></span>
  96 <br />&#x00A0;<span class="subsectionToc" >6.1 <a
  97 href="#x1-320006.1" id="QQ2-1-32">Cross-compilation of external software</a></span>
  98 <br />&#x00A0;<span class="subsectionToc" >6.2 <a
  99 href="#x1-330006.2" id="QQ2-1-33">Coding style</a></span>
 100 <br />&#x00A0;<span class="subsectionToc" >6.3 <a
 101 href="#x1-340006.3" id="QQ2-1-34">Package architecture</a></span>
 102 <br /><span class="sectionToc" >7 <a
 103 href="#x1-350007" id="QQ2-1-35">Bug reports and patches</a></span>
 104 </div>
 105
 106
 107
 108 <!--l. 54--><p class="noindent" >
 109 <h3 class="sectionHead"><span class="titlemark">1   </span> <a
 110  id="x1-20001"></a>Introduction</h3>
 111 <div class="flushleft"
 112 >
 113 <!--l. 55--><p class="noindent" >
 114  This document briefly describes the OpenDreambox distribution, an
 115 embedded Linux distribution for Set-Top-Boxes manufactured by <a
 116 href="http://www.dream-multimedia-tv.de/" >Dream
 117 Multimedia GmbH</a>.
 118 <!--l. 59--><p class="noindent" >OpenDreambox is based on the <a
 119 href="http://www.openembedded.org/" >OpenEmbedded</a> build framework, which uses
 120 <a
 121 href="http://bitbake.berlios.de/" >BitBake</a> to transform build instructions into distributable firmare images and
 122 software packages.
 123 <!--l. 63--><p class="noindent" >The current version, OpenDreambox 2.0, is based on OpenEmbedded &#8221;denzil&#8221;.</div>
 124 <!--l. 66--><p class="noindent" >
 125 <h4 class="subsectionHead"><span class="titlemark">1.1   </span> <a
 126  id="x1-30001.1"></a>Target audience</h4>
 127 <div class="flushleft"
 128 >
 129 <!--l. 67--><p class="noindent" >
 130  Developers familiar with previous versions of OpenDreambox or
 131 OpenEmbedded in general.</div>
 132 <!--l. 72--><p class="noindent" >
 133 <h4 class="subsectionHead"><span class="titlemark">1.2   </span> <a
 134  id="x1-40001.2"></a>Supported products</h4>
 135 <div class="flushleft"
 136 >
 137 <!--l. 74--><p class="noindent" >
 138  The current version includes support for the following machines:
 139 <div class="tabular"> <table id="TBL-2" class="tabular"
 140 cellspacing="0" cellpadding="0" rules="groups"
 141 ><colgroup id="TBL-2-1g"><col
 142 id="TBL-2-1"></colgroup><colgroup id="TBL-2-2g"><col
 143 id="TBL-2-2"></colgroup><tr
 144 class="hline"><td><hr></td><td><hr></td></tr><tr
 145  style="vertical-align:baseline;" id="TBL-2-1-"><td  style="white-space:nowrap; text-align:left;" id="TBL-2-1-1"
 146 class="td11"><span
 147 class="cmbx-10">Product name  </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-2-1-2"
 148 class="td11"><span
 149 class="cmbx-10">Environment variable</span></td></tr><tr
 150 class="hline"><td><hr></td><td><hr></td></tr><tr
 151  style="vertical-align:baseline;" id="TBL-2-2-"><td  style="white-space:nowrap; text-align:left;" id="TBL-2-2-1"
 152 class="td11"> </td><td  style="white-space:nowrap; text-align:left;" id="TBL-2-2-2"
 153 class="td11"></td>
 154 </tr><tr
 155  style="vertical-align:baseline;" id="TBL-2-3-"><td  style="white-space:nowrap; text-align:left;" id="TBL-2-3-1"
 156 class="td11">DM 500 HD         </td><td  style="white-space:nowrap; text-align:left;" id="TBL-2-3-2"
 157 class="td11"><span
 158 class="cmtt-9">MACHINE=dm500hd        </span></td>
 159 </tr><tr
 160  style="vertical-align:baseline;" id="TBL-2-4-"><td  style="white-space:nowrap; text-align:left;" id="TBL-2-4-1"
 161 class="td11">DM 800 HD PVR  </td><td  style="white-space:nowrap; text-align:left;" id="TBL-2-4-2"
 162 class="td11"><span
 163 class="cmtt-9">MACHINE=dm800          </span></td>
 164 </tr><tr
 165  style="vertical-align:baseline;" id="TBL-2-5-"><td  style="white-space:nowrap; text-align:left;" id="TBL-2-5-1"
 166 class="td11">DM 800 HD SE    </td><td  style="white-space:nowrap; text-align:left;" id="TBL-2-5-2"
 167 class="td11"><span
 168 class="cmtt-9">MACHINE=dm800se        </span></td>
 169 </tr><tr
 170  style="vertical-align:baseline;" id="TBL-2-6-"><td  style="white-space:nowrap; text-align:left;" id="TBL-2-6-1"
 171 class="td11">DM 7020 HD       </td><td  style="white-space:nowrap; text-align:left;" id="TBL-2-6-2"
 172 class="td11"><span
 173 class="cmtt-9">MACHINE=dm7020hd       </span></td>
 174 </tr><tr
 175  style="vertical-align:baseline;" id="TBL-2-7-"><td  style="white-space:nowrap; text-align:left;" id="TBL-2-7-1"
 176 class="td11">DM 8000 HD PVR</td><td  style="white-space:nowrap; text-align:left;" id="TBL-2-7-2"
 177 class="td11"><span
 178 class="cmtt-9">MACHINE=dm8000         </span></td>
 179 </tr><tr
 180  style="vertical-align:baseline;" id="TBL-2-8-"><td  style="white-space:nowrap; text-align:left;" id="TBL-2-8-1"
 181 class="td11">                </td><td  style="white-space:nowrap; text-align:left;" id="TBL-2-8-2"
 182 class="td11">                     </td>
 183 </tr><tr
 184 class="hline"><td><hr></td><td><hr></td></tr><tr
 185  style="vertical-align:baseline;" id="TBL-2-9-"><td  style="white-space:nowrap; text-align:left;" id="TBL-2-9-1"
 186 class="td11">                </td>
 187 </tr></table></div></div>
 188
 189
 190
 191 <!--l. 91--><p class="noindent" >
 192 <h4 class="subsectionHead"><span class="titlemark">1.3   </span> <a
 193  id="x1-50001.3"></a>License</h4>
 194
 195
 196
 197 <div class="verbatim" id="verbatim-1">
 198 Copyright&#x00A0;(c)&#x00A0;2010-2012&#x00A0;Dream&#x00A0;Multimedia&#x00A0;GmbH,&#x00A0;Germany
 199 &#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;&#x00A0;http://www.dream-multimedia-tv.de/
 200 &#x00A0;<br />Authors:
 201 &#x00A0;<br />&#x00A0;&#x00A0;Andreas&#x00A0;Frisch&#x00A0;&#x003C;fraxinas@opendreambox.org&#x003E;
 202 &#x00A0;<br />&#x00A0;&#x00A0;Andreas&#x00A0;Monzner&#x00A0;&#x003C;ghost@opendreambox.org&#x003E;
 203 &#x00A0;<br />&#x00A0;&#x00A0;Andreas&#x00A0;Oberritter&#x00A0;&#x003C;obi@opendreambox.org&#x003E;
 204 &#x00A0;<br />&#x00A0;&#x00A0;Mladen&#x00A0;Horvat&#x00A0;&#x003C;acid-burn@opendreambox.org&#x003E;
 205 &#x00A0;<br />&#x00A0;&#x00A0;Stefan&#x00A0;Pluecken&#x00A0;&#x003C;thedoc@opendreambox.org&#x003E;
 206 &#x00A0;<br />&#x00A0;&#x00A0;Stephan&#x00A0;Reichholf&#x00A0;&#x003C;reichi@opendreambox.org&#x003E;
 207 &#x00A0;<br />
 208 &#x00A0;<br />Permission&#x00A0;is&#x00A0;hereby&#x00A0;granted,&#x00A0;free&#x00A0;of&#x00A0;charge,&#x00A0;to&#x00A0;any&#x00A0;person&#x00A0;obtaining&#x00A0;a&#x00A0;copy
 209 &#x00A0;<br />of&#x00A0;this&#x00A0;software&#x00A0;and&#x00A0;associated&#x00A0;documentation&#x00A0;files&#x00A0;(the&#x00A0;"Software"),&#x00A0;to&#x00A0;deal
 210 &#x00A0;<br />in&#x00A0;the&#x00A0;Software&#x00A0;without&#x00A0;restriction,&#x00A0;including&#x00A0;without&#x00A0;limitation&#x00A0;the&#x00A0;rights
 211 &#x00A0;<br />to&#x00A0;use,&#x00A0;copy,&#x00A0;modify,&#x00A0;merge,&#x00A0;publish,&#x00A0;distribute,&#x00A0;sublicense,&#x00A0;and/or&#x00A0;sell
 212 &#x00A0;<br />copies&#x00A0;of&#x00A0;the&#x00A0;Software,&#x00A0;and&#x00A0;to&#x00A0;permit&#x00A0;persons&#x00A0;to&#x00A0;whom&#x00A0;the&#x00A0;Software&#x00A0;is
 213 &#x00A0;<br />furnished&#x00A0;to&#x00A0;do&#x00A0;so,&#x00A0;subject&#x00A0;to&#x00A0;the&#x00A0;following&#x00A0;conditions:
 214 &#x00A0;<br />
 215 &#x00A0;<br />The&#x00A0;above&#x00A0;copyright&#x00A0;notice&#x00A0;and&#x00A0;this&#x00A0;permission&#x00A0;notice&#x00A0;shall&#x00A0;be&#x00A0;included&#x00A0;in
 216 &#x00A0;<br />all&#x00A0;copies&#x00A0;or&#x00A0;substantial&#x00A0;portions&#x00A0;of&#x00A0;the&#x00A0;Software.
 217 &#x00A0;<br />
 218 &#x00A0;<br />THE&#x00A0;SOFTWARE&#x00A0;IS&#x00A0;PROVIDED&#x00A0;"AS&#x00A0;IS",&#x00A0;WITHOUT&#x00A0;WARRANTY&#x00A0;OF&#x00A0;ANY&#x00A0;KIND,&#x00A0;EXPRESS&#x00A0;OR
 219 &#x00A0;<br />IMPLIED,&#x00A0;INCLUDING&#x00A0;BUT&#x00A0;NOT&#x00A0;LIMITED&#x00A0;TO&#x00A0;THE&#x00A0;WARRANTIES&#x00A0;OF&#x00A0;MERCHANTABILITY,
 220 &#x00A0;<br />FITNESS&#x00A0;FOR&#x00A0;A&#x00A0;PARTICULAR&#x00A0;PURPOSE&#x00A0;AND&#x00A0;NONINFRINGEMENT.&#x00A0;IN&#x00A0;NO&#x00A0;EVENT&#x00A0;SHALL&#x00A0;THE
 221 &#x00A0;<br />AUTHORS&#x00A0;OR&#x00A0;COPYRIGHT&#x00A0;HOLDERS&#x00A0;BE&#x00A0;LIABLE&#x00A0;FOR&#x00A0;ANY&#x00A0;CLAIM,&#x00A0;DAMAGES&#x00A0;OR&#x00A0;OTHER
 222 &#x00A0;<br />LIABILITY,&#x00A0;WHETHER&#x00A0;IN&#x00A0;AN&#x00A0;ACTION&#x00A0;OF&#x00A0;CONTRACT,&#x00A0;TORT&#x00A0;OR&#x00A0;OTHERWISE,&#x00A0;ARISING&#x00A0;FROM,
 223 &#x00A0;<br />OUT&#x00A0;OF&#x00A0;OR&#x00A0;IN&#x00A0;CONNECTION&#x00A0;WITH&#x00A0;THE&#x00A0;SOFTWARE&#x00A0;OR&#x00A0;THE&#x00A0;USE&#x00A0;OR&#x00A0;OTHER&#x00A0;DEALINGS&#x00A0;IN
 224 &#x00A0;<br />THE&#x00A0;SOFTWARE.
 225 &#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;</div>
 226 <!--l. 121--><p class="nopar" >
 227 <!--l. 123--><p class="noindent" >
 228 <h4 class="subsectionHead"><span class="titlemark">1.4   </span> <a
 229  id="x1-60001.4"></a>Obtaining the source code</h4>
 230 <!--l. 124--><p class="noindent" >OpenDreambox uses the Git version control system. To obtain the source code, it is
 231 required to install Git. See <a
 232 href="http://git-scm.com/" class="url" ><span
 233 class="cmtt-10">http://git-scm.com/</span></a>.
 234 <!--l. 127--><p class="noindent" >To initially download the source into the current directory, issue the following
 235 command:
 236 <!--l. 130--><p class="noindent" ><span
 237 class="cmtt-9">git clone git://git.opendreambox.org/git/opendreambox.git</span>
 238 <!--l. 132--><p class="noindent" >The Git repository can be viewed online at:
 239 <!--l. 134--><p class="noindent" ><a
 240 href="http://cgit.opendreambox.org/opendreambox.git" class="url" ><span
 241 class="cmtt-10">http://cgit.opendreambox.org/opendreambox.git</span></a>
 242
 243
 244
 245 <!--l. 136--><p class="noindent" >
 246 <h4 class="subsectionHead"><span class="titlemark">1.5   </span> <a
 247  id="x1-70001.5"></a>Quick start</h4>
 248 <!--l. 137--><p class="noindent" >For the impatient:
 249 <!--l. 139--><p class="noindent" ><span
 250 class="cmtt-9">make -C opendreambox image</span>
 251 <!--l. 141--><p class="noindent" >If this command fails, prerequisites my be missing. See section <a
 252 href="#x1-120002">2<!--tex4ht:ref: prerequisites --></a>.
 253 <!--l. 143--><p class="noindent" >
 254 <h4 class="subsectionHead"><span class="titlemark">1.6   </span> <a
 255  id="x1-80001.6"></a>Directory structure</h4>
 256 <!--l. 144--><p class="noindent" >OpenDreambox consists of a set of layers containing build instructions. This meta
 257 data is used by BitBake to download and compile source code and to assemble
 258 installable software packages and firmware images.
 259 <!--l. 148--><p class="noindent" >Currently, there are five layers, ordered by priority from lowest to highest:
 260      <ul class="itemize1">
 261      <li class="itemize"><span
 262 class="cmtt-9">openembedded-core</span>
 263      </li>
 264      <li class="itemize"><span
 265 class="cmtt-9">meta-openembedded</span>
 266      </li>
 267      <li class="itemize"><span
 268 class="cmtt-9">meta-opendreambox</span>
 269      </li>
 270      <li class="itemize"><span
 271 class="cmtt-9">meta-bsp/common</span>
 272      </li>
 273      <li class="itemize"><span
 274 class="cmtt-9">meta-bsp/$</span><span
 275 class="cmsy-9">{</span><span
 276 class="cmtt-9">MACHINE</span><span
 277 class="cmsy-9">}</span></li></ul>
 278 <!--l. 159--><p class="noindent" >If a recipe for the same package exists in multiple layers, then the higher priority
 279 layer takes precedence over the lower priority layer.
 280 <!--l. 163--><p class="noindent" >For example, <span
 281 class="cmtt-9">libmad</span><span
 282 class="cmtt-9">_0.15.1b.bb </span>exists in both <span
 283 class="cmtt-9">meta-openembedded </span>and
 284 <span
 285 class="cmtt-9">openembedded-core</span>. The recipe in <span
 286 class="cmtt-9">meta-openembedded </span>will be used, because
 287 <span
 288 class="cmtt-9">openembedded-core </span>has lower priority.
 289 <!--l. 168--><p class="noindent" ><span
 290 class="cmbx-10">NOTE: </span>This would still be true even if the version of <span
 291 class="cmtt-9">libmad </span>in <span
 292 class="cmtt-9">openembeded-core</span>
 293 was higher than the version in <span
 294 class="cmtt-9">meta-openembedded</span>, unless <span
 295 class="cmtt-9">PREFERRED</span><span
 296 class="cmtt-9">_VERSION</span><span
 297 class="cmtt-9">_libmad</span>
 298 was set to the version in <span
 299 class="cmtt-9">openembedded-core</span>. There is currently no way to prefer a
 300 version of a lower priority layer, if the same version is present in a higher priority
 301 layer.
 302
 303
 304
 305 <!--l. 174--><p class="noindent" >
 306 <h5 class="subsubsectionHead"><span class="titlemark">1.6.1   </span> <a
 307  id="x1-90001.6.1"></a>openembedded-core and meta-openembedded</h5>
 308 <!--l. 175--><p class="noindent" >These directories contain copies of Git repositories from git.openembedded.org,
 309 including the OpenEmbedded-Core layer (&#8221;meta&#8221;) and the OpenEmbedded layer
 310 (&#8221;meta-oe&#8221;). They get created automatically when building the distribution for the
 311 first time.
 312 <!--l. 179--><p class="noindent" >Throughout this document, the combination of these directories will be referred to as
 313 OpenEmbedded.
 314 <!--l. 182--><p class="noindent" >The latest changes to these Git repositories can be seen at:
 315 <!--l. 184--><p class="noindent" ><a
 316 href="http://git.openembedded.org/openembedded-core-contrib/log/?h=obi/current" class="url" ><span
 317 class="cmtt-10">http://git.openembedded.org/openembedded-core-contrib/log/?h=obi/current</span></a>
 318 <!--l. 186--><p class="noindent" ><a
 319 href="http://git.openembedded.org/meta-openembedded-contrib/log/?h=obi/current" class="url" ><span
 320 class="cmtt-10">http://git.openembedded.org/meta-openembedded-contrib/log/?h=obi/current</span></a>
 321 <!--l. 188--><p class="noindent" >
 322 <h5 class="subsubsectionHead"><span class="titlemark">1.6.2   </span> <a
 323  id="x1-100001.6.2"></a>meta-opendreambox</h5>
 324 <!--l. 189--><p class="noindent" >This directory contains:
 325      <ul class="itemize1">
 326      <li class="itemize">Recipes   for   packages   written   specifically   for   the   OpenDreambox
 327      distribution
 328      </li>
 329      <li class="itemize">Modifications to recipes from OpenEmbedded
 330      </li>
 331      <li class="itemize">Recipes   for   software   versions   older   than   those   available   from
 332      OpenEmbedded
 333      </li>
 334      <li class="itemize">Recipes   for   software   versions   newer   than   those   available   from
 335      OpenEmbedded</li></ul>
 336 <!--l. 198--><p class="noindent" >
 337 <h5 class="subsubsectionHead"><span class="titlemark">1.6.3   </span> <a
 338  id="x1-110001.6.3"></a>meta-bsp</h5>
 339 <!--l. 199--><p class="noindent" >The directory <span
 340 class="cmtt-9">meta-bsp </span>contains Board Support Packages (BSP) for the supported
 341 Dreambox models. This includes:
 342      <ul class="itemize1">
 343      <li class="itemize">Hardware drivers
 344
 345
 346
 347      </li>
 348      <li class="itemize">Machine specific overrides
 349      </li>
 350      <li class="itemize">The Linux kernel
 351      </li>
 352      <li class="itemize">The boot loader
 353      </li>
 354      <li class="itemize">Splash images</li></ul>
 355 <!--l. 210--><p class="noindent" >
 356 <h3 class="sectionHead"><span class="titlemark">2   </span> <a
 357  id="x1-120002"></a>Prerequisites</h3>
 358 <!--l. 213--><p class="noindent" >
 359 <h4 class="subsectionHead"><span class="titlemark">2.1   </span> <a
 360  id="x1-130002.1"></a>Required software</h4>
 361 <!--l. 215--><p class="noindent" >The OpenEmbedded project provides a general list of prerequisites for many Linux
 362 distributions and also for some other operating systems.
 363      <ul class="itemize1">
 364      <li class="itemize"><a
 365 href="http://www.openembedded.org/index.php/OEandYourDistro" class="url" ><span
 366 class="cmtt-10">http://www.openembedded.org/index.php/OEandYourDistro</span></a>
 367      </li>
 368      <li class="itemize"><a
 369 href="http://www.openembedded.org/index.php/Required\_software" class="url" ><span
 370 class="cmtt-10">http://www.openembedded.org/index.php/Required\_software</span></a></li></ul>
 371 <!--l. 223--><p class="noindent" >It is highly recommended to use Linux to build OpenDreambox. In theory, any recent
 372 distribution will do, but not many distributions have been verified to build
 373 OpenDreambox without errors. Tested distributions include:
 374      <ul class="itemize1">
 375      <li class="itemize">Arch Linux 2011.08.19 [amd64]
 376      </li>
 377      <li class="itemize">Debian 6.0 (Squeeze) [i386]
 378      </li>
 379      <li class="itemize">Debian &#8221;Testing&#8221; (Wheezy) [i386]
 380      </li>
 381      <li class="itemize">Fedora 16 [i386, amd64]
 382      </li>
 383      <li class="itemize">Ubuntu 10.04 LTS (Lucid Lynx) [i386]
 384
 385
 386
 387      </li>
 388      <li class="itemize">Ubuntu 11.10 (Oneiric Ocelot) [amd64]
 389      </li>
 390      <li class="itemize">Ubuntu 12.04 LTS (Precise Pangolin) [i386, amd64]</li></ul>
 391 <!--l. 238--><p class="noindent" >Distributions known not to work:
 392      <ul class="itemize1">
 393      <li class="itemize">Debian 5.0 (Lenny): Comes with Python 2.5, which is too old.</li></ul>
 394
 395
 396
 397 <!--l. 246--><p class="noindent" >
 398 <h3 class="sectionHead"><span class="titlemark">3   </span> <a
 399  id="x1-140003"></a>Major changes since previous releases</h3>
 400 <!--l. 248--><p class="noindent" >
 401 <h4 class="subsectionHead"><span class="titlemark">3.1   </span> <a
 402  id="x1-150003.1"></a>Changes since release 1.6</h4>
 403      <ul class="itemize1">
 404      <li class="itemize">Recipes were split across multiple layers and categorized.
 405      </li>
 406      <li class="itemize"><span
 407 class="cmtt-9">env.source  </span>has   been   replaced   by   two   files,   <span
 408 class="cmtt-9">bitbake.env  </span>and
 409      <span
 410 class="cmtt-9">cross-compile.env</span>. The former sets a minimal environment that is needed
 411      to execute bitbake. The latter creates machine-specific command aliases,
 412      in order to compile external software.
 413      </li>
 414      <li class="itemize">All machines share a common <span
 415 class="cmtt-9">tmp </span>directory.
 416      </li>
 417      <li class="itemize"><span
 418 class="cmtt-9">$</span><span
 419 class="cmsy-9">{</span><span
 420 class="cmtt-9">MACHINE</span><span
 421 class="cmsy-9">}</span><span
 422 class="cmtt-9">/build </span>directories were renamed to <span
 423 class="cmtt-9">build/$</span><span
 424 class="cmsy-9">{</span><span
 425 class="cmtt-9">MACHINE</span><span
 426 class="cmsy-9">}</span>.
 427      </li>
 428      <li class="itemize">Kernel packages were renamed from <span
 429 class="cmtt-9">linux-$</span><span
 430 class="cmsy-9">{</span><span
 431 class="cmtt-9">MACHINE</span><span
 432 class="cmsy-9">} </span>to <span
 433 class="cmtt-9">linux-dreambox</span>.
 434      </li>
 435      <li class="itemize">Support for machines based on ATI Xilleon or IBM STB was dropped.</li></ul>
 436 <!--l. 261--><p class="noindent" >
 437 <h3 class="sectionHead"><span class="titlemark">4   </span> <a
 438  id="x1-160004"></a>Known Issues</h3>
 439      <ul class="itemize1">
 440      <li class="itemize">Building on eCryptfs fails, because it doesn&#8217;t support sufficiently long
 441      filenames (<a
 442 href="https://bugs.launchpad.net/ecryptfs/+bug/344878" >eCryptfs bug #344878</a>).</li></ul>
 443
 444
 445
 446 <!--l. 269--><p class="noindent" >
 447 <h3 class="sectionHead"><span class="titlemark">5   </span> <a
 448  id="x1-170005"></a>Building OpenDreambox</h3>
 449 <!--l. 271--><p class="noindent" >In the top level directory, there is a <span
 450 class="cmtt-9">Makefile</span>, which is used to set up build
 451 directories and to fetch or update all used repositories. The Makefile can
 452 be influenced by environment variables, either by specifing them on the
 453 command-line or by storing them in a file called <span
 454 class="cmtt-9">conf/make.conf</span>. It is not
 455 recommended to edit the <span
 456 class="cmtt-9">Makefile </span>directly in order to avoid conflicts with future
 457 updates.
 458 <!--l. 278--><p class="noindent" >When the <span
 459 class="cmtt-9">Makefile </span>is run for the first time, the following steps will be executed:
 460      <ul class="itemize1">
 461      <li class="itemize">Creation of configuration files
 462          <ul class="itemize2">
 463          <li class="itemize"><span
 464 class="cmtt-9">bitbake.env</span>
 465          </li>
 466          <li class="itemize"><span
 467 class="cmtt-9">conf/opendreambox.conf</span>
 468          </li>
 469          <li class="itemize"><span
 470 class="cmtt-9">build/$</span><span
 471 class="cmsy-9">{</span><span
 472 class="cmtt-9">MACHINE</span><span
 473 class="cmsy-9">}</span><span
 474 class="cmtt-9">/conf/bblayers.conf</span>
 475          </li>
 476          <li class="itemize"><span
 477 class="cmtt-9">build/$</span><span
 478 class="cmsy-9">{</span><span
 479 class="cmtt-9">MACHINE</span><span
 480 class="cmsy-9">}</span><span
 481 class="cmtt-9">/conf/local.conf</span></li></ul>
 482      </li>
 483      <li class="itemize">Update or checkout of Git repositories
 484          <ul class="itemize2">
 485          <li class="itemize">OpenDreambox
 486          </li>
 487          <li class="itemize">BitBake
 488          </li>
 489          <li class="itemize">OpenEmbedded</li></ul>
 490      </li></ul>
 491 <!--l. 297--><p class="noindent" >
 492 <h4 class="subsectionHead"><span class="titlemark">5.1   </span> <a
 493  id="x1-180005.1"></a>Makefile targets</h4>
 494 <!--l. 298--><p class="noindent" >Run <span
 495 class="cmtt-9">make help </span>to get a list of targets of the top level Makefile, together with a brief
 496 description.
 497
 498
 499
 500 <!--l. 300--><p class="noindent" >
 501 <h4 class="subsectionHead"><span class="titlemark">5.2   </span> <a
 502  id="x1-190005.2"></a>Configuration variables</h4>
 503 <!--l. 301--><p class="noindent" >
 504 <h5 class="subsubsectionHead"><span class="titlemark">5.2.1   </span> <a
 505  id="x1-200005.2.1"></a>BB_NUMBER_THREADS</h5>
 506 <!--l. 302--><p class="noindent" >Controls how many BitBake tasks may run at a time. Defaults to the number of cores
 507 available on the build system. The number of cores is obtained from <span
 508 class="cmtt-9">/proc/cpuinfo</span>. If
 509 this file is unavailable, the default value is 1.
 510 <!--l. 307--><p class="noindent" >
 511 <h5 class="subsubsectionHead"><span class="titlemark">5.2.2   </span> <a
 512  id="x1-210005.2.2"></a>MACHINE</h5>
 513 <!--l. 308--><p class="noindent" >Controls the target machine to build packages for. See section <a
 514 href="#x1-40001.2">1.2<!--tex4ht:ref: products --></a> for a list of
 515 supported products.
 516 <!--l. 311--><p class="noindent" >
 517 <h5 class="subsubsectionHead"><span class="titlemark">5.2.3   </span> <a
 518  id="x1-220005.2.3"></a>PARALLEL_MAKE</h5>
 519 <!--l. 312--><p class="noindent" >Controls how many processes per recipe <span
 520 class="cmtt-9">make </span>may use. Defaults to the number of
 521 cores available on the build system. The number of cores is obtained from
 522 <span
 523 class="cmtt-9">/proc/cpuinfo</span>. If this file is unavailable, the default value is 1.
 524 <!--l. 317--><p class="noindent" >NOTE: If you see seemingly random build failures, try setting this variable to
 525 1.
 526 <!--l. 319--><p class="noindent" >
 527 <h4 class="subsectionHead"><span class="titlemark">5.3   </span> <a
 528  id="x1-230005.3"></a>Adding custom layers</h4>
 529 <!--l. 321--><p class="noindent" >It is possible to add custom layers to the build system. This can be done globally and
 530 per machine. To add a layer globally, edit <span
 531 class="cmtt-9">conf/bblayers-ext.conf</span>. To add a
 532 machine-specific layer, edit <span
 533 class="cmtt-9">conf/bblayers-$</span><span
 534 class="cmsy-9">{</span><span
 535 class="cmtt-9">MACHINE</span><span
 536 class="cmsy-9">}</span><span
 537 class="cmtt-9">-ext.conf</span>. Assuming that an
 538 additional layer is available at <span
 539 class="cmtt-9">$</span><span
 540 class="cmsy-9">{</span><span
 541 class="cmtt-9">HOME</span><span
 542 class="cmsy-9">}</span><span
 543 class="cmtt-9">/custom-layer</span>, the entry to add to the file will
 544 look like this:
 545 <!--l. 327--><p class="noindent" ><span
 546 class="cmtt-9">BBLAYERS =+ "$</span><span
 547 class="cmsy-9">{</span><span
 548 class="cmtt-9">HOME</span><span
 549 class="cmsy-9">}</span><span
 550 class="cmtt-9">/custom-layer"</span>
 551
 552
 553
 554 <!--l. 329--><p class="noindent" >
 555 <h4 class="subsectionHead"><span class="titlemark">5.4   </span> <a
 556  id="x1-240005.4"></a>Adding custom options</h4>
 557 <!--l. 330--><p class="noindent" >It is possible to tweak a lot more options than those used by the <span
 558 class="cmtt-9">Makefile </span>by editing
 559 <span
 560 class="cmtt-9">conf/local-ext.conf </span>or <span
 561 class="cmtt-9">conf/local-$</span><span
 562 class="cmsy-9">{</span><span
 563 class="cmtt-9">MACHINE</span><span
 564 class="cmsy-9">}</span><span
 565 class="cmtt-9">-ext.conf</span>.
 566 <!--l. 333--><p class="noindent" >For example, if the firmware shall use the package feed built on the develoment
 567 machine, which happens to be 192.168.1.1 and has a webserver configured to point to
 568 <span
 569 class="cmtt-9">tmp/deploy/ipk</span>, a line like the following may be added:
 570 <!--l. 337--><p class="noindent" ><span
 571 class="cmtt-9">DISTRO</span><span
 572 class="cmtt-9">_FEED</span><span
 573 class="cmtt-9">_URI = "http://192.168.1.1/$</span><span
 574 class="cmsy-9">{</span><span
 575 class="cmtt-9">DISTRO</span><span
 576 class="cmsy-9">}</span><span
 577 class="cmtt-9">/$</span><span
 578 class="cmsy-9">{</span><span
 579 class="cmtt-9">DISTRO</span><span
 580 class="cmtt-9">_VERSION</span><span
 581 class="cmsy-9">}</span><span
 582 class="cmtt-9">"</span>
 583 <!--l. 339--><p class="noindent" >In general, any variable in OpenEmbedded that uses weak assignment (<span
 584 class="cmtt-9">?=</span>) may be
 585 overridden from these files.
 586 <!--l. 342--><p class="noindent" >The following sections list some commonly used options.
 587 <!--l. 344--><p class="noindent" >
 588 <h5 class="subsubsectionHead"><span class="titlemark">5.4.1   </span> <a
 589  id="x1-250005.4.1"></a>DISTRO_FEED_PREFIX</h5>
 590 <!--l. 346--><p class="noindent" ><span
 591 class="cmtt-9">DISTRO</span><span
 592 class="cmtt-9">_FEED</span><span
 593 class="cmtt-9">_PREFIX </span>specifies the name of the package update feed. This name may be
 594 arbitarily chosen.
 595 <!--l. 349--><p class="noindent" >Default: <span
 596 class="cmtt-9">DISTRO</span><span
 597 class="cmtt-9">_FEED</span><span
 598 class="cmtt-9">_PREFIX = "remote"</span>
 599 <!--l. 351--><p class="noindent" >
 600 <h5 class="subsubsectionHead"><span class="titlemark">5.4.2   </span> <a
 601  id="x1-260005.4.2"></a>DISTRO_FEED_URI</h5>
 602 <!--l. 353--><p class="noindent" ><span
 603 class="cmtt-9">DISTRO</span><span
 604 class="cmtt-9">_FEED</span><span
 605 class="cmtt-9">_URI </span>specifies the URI of the package update feed.
 606 <!--l. 355--><p class="noindent" >Default: <span
 607 class="cmtt-9">DISTRO</span><span
 608 class="cmtt-9">_FEED</span><span
 609 class="cmtt-9">_URI = "http://my-distribution.example/remote-feed/"</span>
 610 <!--l. 357--><p class="noindent" >
 611 <h5 class="subsubsectionHead"><span class="titlemark">5.4.3   </span> <a
 612  id="x1-270005.4.3"></a>INHERIT</h5>
 613 <!--l. 359--><p class="noindent" ><span
 614 class="cmtt-9">INHERIT </span>specifies bbclasses to include from a configuration file. Usually, this variable
 615 gets appended to by using the <span
 616 class="cmtt-9">+= </span>operator.
 617 <!--l. 362--><p class="noindent" >The OpenDreambox distribution automatically appends <span
 618 class="cmtt-9">"buildhistory recipe</span><span
 619 class="cmtt-9">_sanity</span>
 620 <span
 621 class="cmtt-9">testlab" </span>to <span
 622 class="cmtt-9">INHERIT</span>.
 623 <!--l. 364--><p class="noindent" >Default: <span
 624 class="cmtt-9">INHERIT = ""</span>
 625 <!--l. 366--><p class="noindent" ><span
 626 class="cmbx-10">Some examples:</span>
 627 <!--l. 368--><p class="noindent" >Always build the latest versions of OpenDreambox-related projects from
 628 Git:
 629 <!--l. 370--><p class="noindent" ><span
 630 class="cmtt-9">INHERIT += "opendreambox-autorev"</span>
 631
 632
 633
 634 <!--l. 372--><p class="noindent" >Remove temporary files of previous versions of a recipe before a newer version gets
 635 built:
 636 <!--l. 374--><p class="noindent" ><span
 637 class="cmtt-9">INHERIT += "rm</span><span
 638 class="cmtt-9">_old</span><span
 639 class="cmtt-9">_work"</span>
 640 <!--l. 376--><p class="noindent" >Remove temporary files of a recipe after it has been built and packaged
 641 successfully.
 642 <!--l. 378--><p class="noindent" ><span
 643 class="cmtt-9">INHERIT += "rm</span><span
 644 class="cmtt-9">_work"</span>
 645 <!--l. 380--><p class="noindent" >
 646 <h4 class="subsectionHead"><span class="titlemark">5.5   </span> <a
 647  id="x1-280005.5"></a>Setting up a build directory</h4>
 648 <!--l. 381--><p class="noindent" >To set up a build directory for e.g. <span
 649 class="cmbx-10">DM 500 HD </span>run <span
 650 class="cmtt-9">make MACHINE=dm500hd</span>. If
 651 <span
 652 class="cmtt-9">MACHINE=dm500hd </span>has been set in <span
 653 class="cmtt-9">conf/make.conf</span>, you can simply run <span
 654 class="cmtt-9">make </span>with no
 655 arguments instead. This will create and initialize the directory <span
 656 class="cmtt-9">build/dm500hd</span>.
 657 <!--l. 385--><p class="noindent" >
 658 <h4 class="subsectionHead"><span class="titlemark">5.6   </span> <a
 659  id="x1-290005.6"></a>Building a firmware image</h4>
 660 <!--l. 386--><p class="noindent" >To build a firmware image for e.g. <span
 661 class="cmbx-10">DM 500 HD </span>run <span
 662 class="cmtt-9">make MACHINE=dm500hd image</span>. If
 663 <span
 664 class="cmtt-9">MACHINE=dm500hd </span>has been set in <span
 665 class="cmtt-9">conf/make.conf</span>, you can simply run <span
 666 class="cmtt-9">make image</span>
 667 instead.
 668 <!--l. 390--><p class="noindent" >
 669 <h4 class="subsectionHead"><span class="titlemark">5.7   </span> <a
 670  id="x1-300005.7"></a>Building a package</h4>
 671 <!--l. 391--><p class="noindent" >To build a single package, BitBake has to be used directly. First, the environment has
 672 to be set up, in order to make BitBake available to the shell. This can be done with
 673 the following command:
 674 <!--l. 395--><p class="noindent" ><span
 675 class="cmtt-9">source bitbake.env</span>
 676 <!--l. 397--><p class="noindent" >BitBake must be run from the machine&#8217;s build directory. For <span
 677 class="cmbx-10">DM 500 HD</span>
 678 run:
 679 <!--l. 399--><p class="noindent" ><span
 680 class="cmtt-9">cd build/dm500hd</span>
 681 <!--l. 401--><p class="noindent" >In order to build enigma2, run:
 682 <!--l. 403--><p class="noindent" ><span
 683 class="cmtt-9">bitbake enigma2</span>.
 684
 685
 686
 687 <!--l. 405--><p class="noindent" >
 688 <h3 class="sectionHead"><span class="titlemark">6   </span> <a
 689  id="x1-310006"></a>Development hints</h3>
 690 <!--l. 407--><p class="noindent" >
 691 <h4 class="subsectionHead"><span class="titlemark">6.1   </span> <a
 692  id="x1-320006.1"></a>Cross-compilation of external software</h4>
 693 <!--l. 408--><p class="noindent" >OpenDreambox provides a script called <span
 694 class="cmtt-9">cross-compile.env</span>. Once run, the script will
 695 create the following commands (shell aliases), aiming to ease cross-compilation of
 696 external source trees:
 697      <ul class="itemize1">
 698      <li class="itemize"><span
 699 class="cmtt-9">oe</span><span
 700 class="cmtt-9">_autoreconf </span>- Calls OE&#8217;s version of <span
 701 class="cmtt-9">autoreconf</span>. Useful for projects based
 702      on GNU autotools.
 703      </li>
 704      <li class="itemize"><span
 705 class="cmtt-9">oe</span><span
 706 class="cmtt-9">_runconf </span>- Calls <span
 707 class="cmtt-9">./configure </span>with parameters suitable for OE. Useful
 708      for projects based on GNU autotools.
 709      </li>
 710      <li class="itemize"><span
 711 class="cmtt-9">oe</span><span
 712 class="cmtt-9">_runmake </span>-  Calls  <span
 713 class="cmtt-9">make </span>with  parameters  suitable  for  OE.  Useful  for
 714      projects based on GNU autotools or GNU make.
 715      </li>
 716      <li class="itemize"><span
 717 class="cmtt-9">oe</span><span
 718 class="cmtt-9">_env </span>- Useful to execute arbitrary commands in the OE environment
 719      (e.g. <span
 720 class="cmtt-9">oe</span><span
 721 class="cmtt-9">_env env</span>).
 722      </li>
 723      <li class="itemize"><span
 724 class="cmtt-9">oe</span><span
 725 class="cmtt-9">_setenv </span>- Exports the OE environment to the currently running shell
 726      session.</li></ul>
 727 <!--l. 419--><p class="noindent" >The script needs to know the target machine, which can be one of the supported
 728 products (see <a
 729 href="#x1-40001.2">1.2<!--tex4ht:ref: products --></a>). Because the script adds aliases to your currently running shell
 730 session, it has to be invoked using <span
 731 class="cmtt-9">source </span>or <span
 732 class="cmtt-9">. </span>(the dot operator), e.g.:
 733 <!--l. 422--><p class="noindent" ><span
 734 class="cmtt-9">source cross-compile.env dm7020hd</span>
 735 <!--l. 424--><p class="noindent" >The script may be called from any location, but must reside inside the OpenDreambox
 736 Git tree. You may want to create a symlink to <span
 737 class="cmtt-9">cross-compile.env </span>somewhere in your
 738 <span
 739 class="cmtt-9">PATH</span>.
 740 <!--l. 427--><p class="noindent" >
 741 <h4 class="subsectionHead"><span class="titlemark">6.2   </span> <a
 742  id="x1-330006.2"></a>Coding style</h4>
 743 <!--l. 428--><p class="noindent" >Run <span
 744 class="cmtt-9">scripts/do</span><span
 745 class="cmtt-9">_stylize.sh </span>on new recipes to ensure proper coding style.
 746
 747
 748
 749 <!--l. 430--><p class="noindent" >
 750 <h4 class="subsectionHead"><span class="titlemark">6.3   </span> <a
 751  id="x1-340006.3"></a>Package architecture</h4>
 752 <!--l. 431--><p class="noindent" >Set <span
 753 class="cmtt-9">PACKAGE</span><span
 754 class="cmtt-9">_ARCH = "$</span><span
 755 class="cmsy-9">{</span><span
 756 class="cmtt-9">MACHINE</span><span
 757 class="cmtt-9">_ARCH</span><span
 758 class="cmsy-9">}</span><span
 759 class="cmtt-9">" </span>if either condition is met:
 760      <ul class="itemize1">
 761      <li class="itemize">The     recipe     uses     <span
 762 class="cmtt-9">COMBINED</span><span
 763 class="cmtt-9">_FEATURES</span>,     <span
 764 class="cmtt-9">MACHINE</span><span
 765 class="cmtt-9">_FEATURES    </span>or
 766      <span
 767 class="cmtt-9">DREAMBOX</span><span
 768 class="cmtt-9">_FEATURES</span>.
 769      </li>
 770      <li class="itemize">The recipe is part of <span
 771 class="cmtt-9">meta-bsp</span>.</li></ul>
 772 <!--l. 437--><p class="noindent" >
 773 <h3 class="sectionHead"><span class="titlemark">7   </span> <a
 774  id="x1-350007"></a>Bug reports and patches</h3>
 775 <!--l. 439--><p class="noindent" >Please send bug reports and patches to the Enigma2 development mailing list
 776 <span
 777 class="cmtt-9">&#x003C;enigma2-devel@lists.elitedvb.net&#x003E;</span>.
 778 <!--l. 441--><p class="noindent" >A comfortable way to create patches is to use <span
 779 class="cmtt-9">git format-patch</span>, after all changes
 780 have been committed to your local copy of the repository.
 781
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