doc/html/user-guide/cdl-concepts.html

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  12 >CDL Concepts</TITLE
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  81 CLASS="CHAPTER"
  82 ><H1
  83 ><A
  84 NAME="CDL-CONCEPTS">Chapter 24. CDL Concepts</H1
  85 ><DIV
  86 CLASS="TOC"
  87 ><DL
  88 ><DT
  89 ><B
  90 >Table of Contents</B
  91 ></DT
  92 ><DT
  93 ><A
  94 HREF="cdl-concepts.html#CDL-CONCEPTS-ABOUT"
  95 >About this chapter</A
  96 ></DT
  97 ><DT
  98 ><A
  99 HREF="cdl-component-repository.html"
 100 >Component Repository</A
 101 ></DT
 102 ><DT
 103 ><A
 104 HREF="cdl-component-definition-language.html"
 105 >Component Definition Language</A
 106 ></DT
 107 ><DT
 108 ><A
 109 HREF="cdl-packages.html"
 110 >Packages</A
 111 ></DT
 112 ><DT
 113 ><A
 114 HREF="cdl-configuration-items.html"
 115 >Configuration Items</A
 116 ></DT
 117 ><DT
 118 ><A
 119 HREF="cdl-conflicts.html"
 120 >Conflicts</A
 121 ></DT
 122 ><DT
 123 ><A
 124 HREF="cdl-templates.html"
 125 >Templates</A
 126 ></DT
 127 ></DL
 128 ></DIV
 129 ><DIV
 130 CLASS="SECT1"
 131 ><H1
 132 CLASS="SECT1"
 133 ><A
 134 NAME="CDL-CONCEPTS-ABOUT">About this chapter</H1
 135 ><P
 136 >This chapter serves as a brief introduction to the
 137         concepts involved in <SPAN
 138 CLASS="PRODUCTNAME"
 139 >eCos</SPAN
 140 > (Embedded Configurable Operating
 141         System).  It describes the configuration architecture and the
 142         underlying technology to a level required for the embedded
 143         systems developer to configure <SPAN
 144 CLASS="PRODUCTNAME"
 145 >eCos</SPAN
 146 >.  It does not describe in
 147         detail aspects such as how to write reusable components for
 148         <SPAN
 149 CLASS="PRODUCTNAME"
 150 >eCos</SPAN
 151 >: this information is given in the <I
 152 CLASS="CITETITLE"
 153 >Component
 154           Writer&#8217;s Guide</I
 155 >.</P
 156 ><DIV
 157 CLASS="SECT2"
 158 ><H2
 159 CLASS="SECT2"
 160 ><A
 161 NAME="AEN1835">Background</H2
 162 ><P
 163 >Software solutions for the embedded space place
 164           particularly stringent demands on the developer, typically
 165           represented as requirements for small memory footprint, high
 166           performance and robustness.  These demands are addressed in
 167           <SPAN
 168 CLASS="PRODUCTNAME"
 169 >eCos</SPAN
 170 > by providing the ability to perform compile-time
 171           specialization: the developer can tailor the operating
 172           system to suit the needs of the application.  In order to
 173           make this process manageable, <SPAN
 174 CLASS="PRODUCTNAME"
 175 >eCos</SPAN
 176 > is built in the context
 177           of a Configuration Infrastructure: a set of tools including
 178           a <SPAN
 179 CLASS="APPLICATION"
 180 >Configuration Tool</SPAN
 181 > and a formal
 182           description of the process of configuration by means of a
 183           <SPAN
 184 CLASS="emphasis"
 185 ><I
 186 CLASS="EMPHASIS"
 187 >Component Definition Language</I
 188 ></SPAN
 189 >.</P
 190 ></DIV
 191 ><DIV
 192 CLASS="SECT2"
 193 ><H2
 194 CLASS="SECT2"
 195 ><A
 196 NAME="AEN1842">Configurations</H2
 197 ><P
 198 ><SPAN
 199 CLASS="PRODUCTNAME"
 200 >eCos</SPAN
 201 > is tailored at source level (that is, before
 202             compilation or assembly) in order to create an <SPAN
 203 CLASS="PRODUCTNAME"
 204 >eCos</SPAN
 205 >
 206             <SPAN
 207 CLASS="emphasis"
 208 ><I
 209 CLASS="EMPHASIS"
 210 >configuration</I
 211 ></SPAN
 212 >. In concrete terms, an
 213             <SPAN
 214 CLASS="PRODUCTNAME"
 215 >eCos</SPAN
 216 > configuration takes the form of a configuration save
 217             file (with extension .ecc) and set of files used to build
 218             user applications (including, when built, a library file
 219             against which the application is linked). </P
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