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<title>9.1 ROM system overview</title>

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<h2>
  <a name="1207245"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">9.1 	 ROM system overview</font>
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  <a name="1204431"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">When booting from a host, chip and C/C++ language initialization is performed by <strong>st20run</strong>. When booting from ROM, these tasks must be performed by the ROM code. When <strong>st20cc</strong> generates a ROM image file it adds bootstrap code to set up the processor and the C/C++ language runtime system. This is called automatically on device reset, before calling the program's <font size=2 face=Courier><strong>main</strong></font> function.</font>
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  <a name="1204433"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The ROM C-startup bootstrap code performs the following tasks:</font>
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<p>  <font size=2  face="Verdana, Arial, Helvetica, sans-serif"><li  value="1"><a name="1204434"> </a>Set up a temporary workspace for itself in internal memory. If <font size=2 face=Courier><strong>initstack</strong></font> was specified at link time, <span class=Signal>Wptr</span> is set to this command's argument, otherwise <span class=Signal>Wptr</span> is not modified. See <a href="rom11.htm#1204637"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Section

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