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17<title>Debugging with GDB: OpenRISC 1000</title>
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70<a name="OpenRISC-1000-1"></a>
71<h4 class="subsection">21.3.7 OpenRISC 1000</h4>
72<a name="index-OpenRISC-1000"></a>
73
74<p>The OpenRISC 1000 provides a free RISC instruction set architecture.  It is
75mainly provided as a soft-core which can run on Xilinx, Altera and other
76FPGA&rsquo;s.
77</p>
78<p><small>GDB</small> for OpenRISC supports the below commands when connecting to
79a target:
80</p>
81<dl compact="compact">
82<dd>
83<a name="index-target-sim"></a>
84</dd>
85<dt><code>target sim</code></dt>
86<dd>
87<p>Runs the builtin CPU simulator which can run very basic
88programs but does not support most hardware functions like MMU.
89For more complex use cases the user is advised to run an external
90target, and connect using &lsquo;<samp>target remote</samp>&rsquo;.
91</p>
92<p>Example: <code>target sim</code>
93</p>
94</dd>
95<dt><code>set debug or1k</code></dt>
96<dd><p>Toggle whether to display OpenRISC-specific debugging messages from the
97OpenRISC target support subsystem.
98</p>
99</dd>
100<dt><code>show debug or1k</code></dt>
101<dd><p>Show whether OpenRISC-specific debugging messages are enabled.
102</p></dd>
103</dl>
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