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17<title>Debugging with GDB: MicroBlaze</title>
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64<a name="MicroBlaze"></a>
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70<a name="MicroBlaze-1"></a>
71<h4 class="subsection">21.3.5 MicroBlaze</h4>
72<a name="index-Xilinx-MicroBlaze"></a>
73<a name="index-XMD_002c-Xilinx-Microprocessor-Debugger"></a>
74
75<p>The MicroBlaze is a soft-core processor supported on various Xilinx
76FPGAs, such as Spartan or Virtex series.  Boards with these processors
77usually have JTAG ports which connect to a host system running the Xilinx
78Embedded Development Kit (EDK) or Software Development Kit (SDK).
79This host system is used to download the configuration bitstream to
80the target FPGA.  The Xilinx Microprocessor Debugger (XMD) program
81communicates with the target board using the JTAG interface and
82presents a <code>gdbserver</code> interface to the board.  By default
83<code>xmd</code> uses port <code>1234</code>.  (While it is possible to change
84this default port, it requires the use of undocumented <code>xmd</code>
85commands.  Contact Xilinx support if you need to do this.)
86</p>
87<p>Use these GDB commands to connect to the MicroBlaze target processor.
88</p>
89<dl compact="compact">
90<dt><code>target remote :1234</code></dt>
91<dd><p>Use this command to connect to the target if you are running <small>GDB</small>
92on the same system as <code>xmd</code>.
93</p>
94</dd>
95<dt><code>target remote <var>xmd-host</var>:1234</code></dt>
96<dd><p>Use this command to connect to the target if it is connected to <code>xmd</code>
97running on a different system named <var>xmd-host</var>.
98</p>
99</dd>
100<dt><code>load</code></dt>
101<dd><p>Use this command to download a program to the MicroBlaze target.
102</p>
103</dd>
104<dt><code>set debug microblaze <var>n</var></code></dt>
105<dd><p>Enable MicroBlaze-specific debugging messages if non-zero.
106</p>
107</dd>
108<dt><code>show debug microblaze <var>n</var></code></dt>
109<dd><p>Show MicroBlaze-specific debugging level.
110</p></dd>
111</dl>
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