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  43    <div id="projectname">CMSIS-Core (Cortex-M)
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  52    <div id="projectbrief">CMSIS-Core support for Cortex-M processor-based devices</div>
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 127   <div class="headertitle"><div class="title">Scatter-Loading description file &lt;device&gt;_ac6.sct </div></div>
 128 </div><!--header-->
 129 <div class="contents">
 130 <div class="textblock"><p><a class="anchor" id="md_src_core_linker_sct"></a> A scatter file for linking is required when using a <a class="el" href="startup_c_pg.html">Startup File startup_&lt;Device&gt;.c</a>.</p>
 131 <p>The <a class="el" href="linker_sct_pg.html">Scatter-Loading description file &lt;device&gt;_ac6.sct</a> contains regions for:</p>
 132 <ul>
 133 <li>Code (read-only data, execute-only data)</li>
 134 <li>RAM (read/write data, zero-initialized data)</li>
 135 <li>Stack</li>
 136 <li>Heap</li>
 137 <li>Stack seal (for Armv8-M/v8.1-M)</li>
 138 <li>CMSE veneer (for Armv8-M/v8.1-M)</li>
 139 </ul>
 140 <p>Within the scatter file, the user needs to specify a set of macros. The scatter file is passed through the C preprocessor which uses these macros to calculate the start address and the size of the different regions.</p>
 141 <div class="fragment"><div class="line">/*--------------------- Flash Configuration ----------------------------------</div>
 142 <div class="line">; &lt;h&gt; Flash Configuration</div>
 143 <div class="line">;   &lt;o0&gt; Flash Base Address &lt;0x0-0xFFFFFFFF:8&gt;</div>
 144 <div class="line">;   &lt;o1&gt; Flash Size (in Bytes) &lt;0x0-0xFFFFFFFF:8&gt;</div>
 145 <div class="line">; &lt;/h&gt;</div>
 146 <div class="line"> *----------------------------------------------------------------------------*/</div>
 147 <div class="line">#define __ROM_BASE      0x00000000</div>
 148 <div class="line">#define __ROM_SIZE      0x00080000</div>
 149 <div class="line"> </div>
 150 <div class="line">/*--------------------- Embedded RAM Configuration ---------------------------</div>
 151 <div class="line">; &lt;h&gt; RAM Configuration</div>
 152 <div class="line">;   &lt;o0&gt; RAM Base Address    &lt;0x0-0xFFFFFFFF:8&gt;</div>
 153 <div class="line">;   &lt;o1&gt; RAM Size (in Bytes) &lt;0x0-0xFFFFFFFF:8&gt;</div>
 154 <div class="line">; &lt;/h&gt;</div>
 155 <div class="line"> *----------------------------------------------------------------------------*/</div>
 156 <div class="line">#define __RAM_BASE      0x20000000</div>
 157 <div class="line">#define __RAM_SIZE      0x00040000</div>
 158 <div class="line"> </div>
 159 <div class="line">/*--------------------- Stack / Heap Configuration ---------------------------</div>
 160 <div class="line">; &lt;h&gt; Stack / Heap Configuration</div>
 161 <div class="line">;   &lt;o0&gt; Stack Size (in Bytes) &lt;0x0-0xFFFFFFFF:8&gt;</div>
 162 <div class="line">;   &lt;o1&gt; Heap Size (in Bytes) &lt;0x0-0xFFFFFFFF:8&gt;</div>
 163 <div class="line">; &lt;/h&gt;</div>
 164 <div class="line"> *----------------------------------------------------------------------------*/</div>
 165 <div class="line">#define __STACK_SIZE    0x00000200</div>
 166 <div class="line">#define __HEAP_SIZE     0x00000C00</div>
 167 <div class="line"> </div>
 168 <div class="line">/*--------------------- CMSE Veneer Configuration ---------------------------</div>
 169 <div class="line">; &lt;h&gt; CMSE Veneer Configuration</div>
 170 <div class="line">;   &lt;o0&gt;  CMSE Veneer Size (in Bytes) &lt;0x0-0xFFFFFFFF:32&gt;</div>
 171 <div class="line">; &lt;/h&gt;</div>
 172 <div class="line"> *----------------------------------------------------------------------------*/</div>
 173 <div class="line">#define __CMSEVENEER_SIZE    0x200</div>
 174 </div><!-- fragment --><blockquote class="doxtable">
 175 <p>&zwj;<b>Note</b></p><ul>
 176 <li>The stack is placed at the end of the available RAM and is growing downwards whereas the Heap is placed after the application data and growing upwards. </li>
 177 </ul>
 178 </blockquote>
 179 <h1><a class="anchor" id="linker_sct_preproc_sec"></a>
 180 Preprocessor command</h1>
 181 <p>The scatter file uses following preprocessor command for Arm Compiler v6</p>
 182 <div class="fragment"><div class="line">#! armclang -E --target=arm-arm-none-eabi -mcpu=&amp;lt;mcpu&amp;gt; -xc</div>
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