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 <a name="MIPS-Embedded"></a>
 <div class="header">
 <p>
 Next: <a href="PowerPC-Embedded.html#PowerPC-Embedded" accesskey="n" rel="next">PowerPC Embedded</a>, Previous: <a href="MicroBlaze.html#MicroBlaze" accesskey="p" rel="prev">MicroBlaze</a>, Up: <a href="Embedded-Processors.html#Embedded-Processors" accesskey="u" rel="up">Embedded Processors</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
 </div>
 <hr>
 <a name="MIPS-Embedded-1"></a>
 <h4 class="subsection">21.3.5 <acronym>MIPS</acronym> Embedded</h4>

 <a name="index-MIPS-boards"></a>
 <p><small>GDB</small> can use the <acronym>MIPS</acronym> remote debugging protocol to talk to a
 <acronym>MIPS</acronym> board attached to a serial line.  This is available when
 you configure <small>GDB</small> with &lsquo;<samp>--target=mips-elf</samp>&rsquo;.
 </p>
 <p>Use these <small>GDB</small> commands to specify the connection to your target board:
 </p>
 <dl compact="compact">
 <dt><code>target mips <var>port</var></code></dt>
 <dd><a name="index-target-mips-port"></a>
 <p>To run a program on the board, start up <code>gdb</code> with the
 name of your program as the argument.  To connect to the board, use the
 command &lsquo;<samp>target mips <var>port</var></samp>&rsquo;, where <var>port</var> is the name of
 the serial port connected to the board.  If the program has not already
 been downloaded to the board, you may use the <code>load</code> command to
 download it.  You can then use all the usual <small>GDB</small> commands.
 </p>
 <p>For example, this sequence connects to the target board through a serial
 port, and loads and runs a program called <var>prog</var> through the
 debugger:
 </p>
 <div class="smallexample">
 <pre class="smallexample">host$ gdb <var>prog</var>
 GDB is free software and &hellip;
 (gdb) target mips /dev/ttyb
 (gdb) load <var>prog</var>
 (gdb) run
 </pre></div>

 </dd>
 <dt><code>target mips <var>hostname</var>:<var>portnumber</var></code></dt>
 <dd><p>On some <small>GDB</small> host configurations, you can specify a TCP
 connection (for instance, to a serial line managed by a terminal
 concentrator) instead of a serial port, using the syntax
 &lsquo;<samp><var>hostname</var>:<var>portnumber</var></samp>&rsquo;.
 </p>
 </dd>
 <dt><code>target pmon <var>port</var></code></dt>
 <dd><a name="index-target-pmon-port"></a>
 <p>PMON ROM monitor.
 </p>
 </dd>
 <dt><code>target ddb <var>port</var></code></dt>
 <dd><a name="index-target-ddb-port"></a>
 <p>NEC&rsquo;s DDB variant of PMON for Vr4300.
 </p>
 </dd>
 <dt><code>target lsi <var>port</var></code></dt>
 <dd><a name="index-target-lsi-port"></a>
 <p>LSI variant of PMON.
 </p>
 <a name="index-target-r3900"></a>
 </dd>
 <dt><code>target r3900 <var>dev</var></code></dt>
 <dd><p>Densan DVE-R3900 ROM monitor for Toshiba R3900 Mips.
 </p>
 <a name="index-target-array"></a>
 </dd>
 <dt><code>target array <var>dev</var></code></dt>
 <dd><p>Array Tech LSI33K RAID controller board.
 </p>
 </dd>
 </dl>


 <p><small>GDB</small> also supports these special commands for <acronym>MIPS</acronym> targets:
 </p>
 <dl compact="compact">
 <dt><code>set mipsfpu double</code></dt>
 <dt><code>set mipsfpu single</code></dt>
 <dt><code>set mipsfpu none</code></dt>
 <dt><code>set mipsfpu auto</code></dt>
 <dt><code>show mipsfpu</code></dt>
 <dd><a name="index-set-mipsfpu"></a>
 <a name="index-show-mipsfpu"></a>
 <a name="index-MIPS-remote-floating-point"></a>
 <a name="index-floating-point_002c-MIPS-remote"></a>
 <p>If your target board does not support the <acronym>MIPS</acronym> floating point
 coprocessor, you should use the command &lsquo;<samp>set mipsfpu none</samp>&rsquo; (if you
 need this, you may wish to put the command in your <small>GDB</small> init
 file).  This tells <small>GDB</small> how to find the return value of
 functions which return floating point values.  It also allows
 <small>GDB</small> to avoid saving the floating point registers when calling
 functions on the board.  If you are using a floating point coprocessor
 with only single precision floating point support, as on the <small>R4650</small>
 processor, use the command &lsquo;<samp>set mipsfpu single</samp>&rsquo;.  The default
 double precision floating point coprocessor may be selected using
 &lsquo;<samp>set mipsfpu double</samp>&rsquo;.
 </p>
 <p>In previous versions the only choices were double precision or no
 floating point, so &lsquo;<samp>set mipsfpu on</samp>&rsquo; will select double precision
 and &lsquo;<samp>set mipsfpu off</samp>&rsquo; will select no floating point.
 </p>
 <p>As usual, you can inquire about the <code>mipsfpu</code> variable with
 &lsquo;<samp>show mipsfpu</samp>&rsquo;.
 </p>
 </dd>
 <dt><code>set timeout <var>seconds</var></code></dt>
 <dt><code>set retransmit-timeout <var>seconds</var></code></dt>
 <dt><code>show timeout</code></dt>
 <dt><code>show retransmit-timeout</code></dt>
 <dd><a name="index-timeout_002c-MIPS-protocol"></a>
 <a name="index-retransmit_002dtimeout_002c-MIPS-protocol"></a>
 <a name="index-set-timeout"></a>
 <a name="index-show-timeout"></a>
 <a name="index-set-retransmit_002dtimeout"></a>
 <a name="index-show-retransmit_002dtimeout"></a>
 <p>You can control the timeout used while waiting for a packet, in the <acronym>MIPS</acronym>
 remote protocol, with the <code>set timeout <var>seconds</var></code> command.  The
 default is 5 seconds.  Similarly, you can control the timeout used while
 waiting for an acknowledgment of a packet with the <code>set
 retransmit-timeout <var>seconds</var></code> command.  The default is 3 seconds.
 You can inspect both values with <code>show timeout</code> and <code>show
 retransmit-timeout</code>.  (These commands are <em>only</em> available when
 <small>GDB</small> is configured for &lsquo;<samp>--target=mips-elf</samp>&rsquo;.)
 </p>
 <p>The timeout set by <code>set timeout</code> does not apply when <small>GDB</small>
 is waiting for your program to stop.  In that case, <small>GDB</small> waits
 forever because it has no way of knowing how long the program is going
 to run before stopping.
 </p>
 </dd>
 <dt><code>set syn-garbage-limit <var>num</var></code></dt>
 <dd><a name="index-set-syn_002dgarbage_002dlimit_002c-MIPS-remote"></a>
 <a name="index-synchronize-with-remote-MIPS-target"></a>
 <p>Limit the maximum number of characters <small>GDB</small> should ignore when
 it tries to synchronize with the remote target.  The default is 10
 characters.  Setting the limit to -1 means there&rsquo;s no limit.
 </p>
 </dd>
 <dt><code>show syn-garbage-limit</code></dt>
 <dd><a name="index-show-syn_002dgarbage_002dlimit_002c-MIPS-remote"></a>
 <p>Show the current limit on the number of characters to ignore when
 trying to synchronize with the remote system.
 </p>
 </dd>
 <dt><code>set monitor-prompt <var>prompt</var></code></dt>
 <dd><a name="index-set-monitor_002dprompt_002c-MIPS-remote"></a>
 <a name="index-remote-monitor-prompt"></a>
 <p>Tell <small>GDB</small> to expect the specified <var>prompt</var> string from the
 remote monitor.  The default depends on the target:
 </p><dl compact="compact">
 <dt>pmon target</dt>
 <dd><p>&lsquo;<samp>PMON</samp>&rsquo;
 </p></dd>
 <dt>ddb target</dt>
 <dd><p>&lsquo;<samp>NEC010</samp>&rsquo;
 </p></dd>
 <dt>lsi target</dt>
 <dd><p>&lsquo;<samp>PMON&gt;</samp>&rsquo;
 </p></dd>
 </dl>

 </dd>
 <dt><code>show monitor-prompt</code></dt>
 <dd><a name="index-show-monitor_002dprompt_002c-MIPS-remote"></a>
 <p>Show the current strings <small>GDB</small> expects as the prompt from the
 remote monitor.
 </p>
 </dd>
 <dt><code>set monitor-warnings</code></dt>
 <dd><a name="index-set-monitor_002dwarnings_002c-MIPS-remote"></a>
 <p>Enable or disable monitor warnings about hardware breakpoints.  This
 has effect only for the <code>lsi</code> target.  When on, <small>GDB</small> will
 display warning messages whose codes are returned by the <code>lsi</code>
 PMON monitor for breakpoint commands.
 </p>
 </dd>
 <dt><code>show monitor-warnings</code></dt>
 <dd><a name="index-show-monitor_002dwarnings_002c-MIPS-remote"></a>
 <p>Show the current setting of printing monitor warnings.
 </p>
 </dd>
 <dt><code>pmon <var>command</var></code></dt>
 <dd><a name="index-pmon_002c-MIPS-remote"></a>
 <a name="index-send-PMON-command"></a>
 <p>This command allows sending an arbitrary <var>command</var> string to the
 monitor.  The monitor must be in debug mode for this to work.
 </p></dd>
 </dl>

 <hr>
 <div class="header">
 <p>
 Next: <a href="PowerPC-Embedded.html#PowerPC-Embedded" accesskey="n" rel="next">PowerPC Embedded</a>, Previous: <a href="MicroBlaze.html#MicroBlaze" accesskey="p" rel="prev">MicroBlaze</a>, Up: <a href="Embedded-Processors.html#Embedded-Processors" accesskey="u" rel="up">Embedded Processors</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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	<a name="MIPS-Embedded"></a>
	<div class="header">
	<p>
	Next: <a href="PowerPC-Embedded.html#PowerPC-Embedded" accesskey="n" rel="next">PowerPC Embedded</a>, Previous: <a href="MicroBlaze.html#MicroBlaze" accesskey="p" rel="prev">MicroBlaze</a>, Up: <a href="Embedded-Processors.html#Embedded-Processors" accesskey="u" rel="up">Embedded Processors</a>   [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
	</div>
	<hr>
	<a name="MIPS-Embedded-1"></a>
	<h4 class="subsection">21.3.5 <acronym>MIPS</acronym> Embedded</h4>

	<a name="index-MIPS-boards"></a>
	<p><small>GDB</small> can use the <acronym>MIPS</acronym> remote debugging protocol to talk to a
	<acronym>MIPS</acronym> board attached to a serial line. This is available when
	you configure <small>GDB</small> with ‘<samp>--target=mips-elf</samp>’.
	</p>
	<p>Use these <small>GDB</small> commands to specify the connection to your target board:
	</p>
	<dl compact="compact">
	<dt><code>target mips <var>port</var></code></dt>
	<dd><a name="index-target-mips-port"></a>
	<p>To run a program on the board, start up <code>gdb</code> with the
	name of your program as the argument. To connect to the board, use the
	command ‘<samp>target mips <var>port</var></samp>’, where <var>port</var> is the name of
	the serial port connected to the board. If the program has not already
	been downloaded to the board, you may use the <code>load</code> command to
	download it. You can then use all the usual <small>GDB</small> commands.
	</p>
	<p>For example, this sequence connects to the target board through a serial
	port, and loads and runs a program called <var>prog</var> through the
	debugger:
	</p>
	<div class="smallexample">
	<pre class="smallexample">host$ gdb <var>prog</var>
	GDB is free software and …
	(gdb) target mips /dev/ttyb
	(gdb) load <var>prog</var>
	(gdb) run
	</pre></div>

	</dd>
	<dt><code>target mips <var>hostname</var>:<var>portnumber</var></code></dt>
	<dd><p>On some <small>GDB</small> host configurations, you can specify a TCP
	connection (for instance, to a serial line managed by a terminal
	concentrator) instead of a serial port, using the syntax
	‘<samp><var>hostname</var>:<var>portnumber</var></samp>’.
	</p>
	</dd>
	<dt><code>target pmon <var>port</var></code></dt>
	<dd><a name="index-target-pmon-port"></a>
	<p>PMON ROM monitor.
	</p>
	</dd>
	<dt><code>target ddb <var>port</var></code></dt>
	<dd><a name="index-target-ddb-port"></a>
	<p>NEC’s DDB variant of PMON for Vr4300.
	</p>
	</dd>
	<dt><code>target lsi <var>port</var></code></dt>
	<dd><a name="index-target-lsi-port"></a>
	<p>LSI variant of PMON.
	</p>
	<a name="index-target-r3900"></a>
	</dd>
	<dt><code>target r3900 <var>dev</var></code></dt>
	<dd><p>Densan DVE-R3900 ROM monitor for Toshiba R3900 Mips.
	</p>
	<a name="index-target-array"></a>
	</dd>
	<dt><code>target array <var>dev</var></code></dt>
	<dd><p>Array Tech LSI33K RAID controller board.
	</p>
	</dd>
	</dl>


	<p><small>GDB</small> also supports these special commands for <acronym>MIPS</acronym> targets:
	</p>
	<dl compact="compact">
	<dt><code>set mipsfpu double</code></dt>
	<dt><code>set mipsfpu single</code></dt>
	<dt><code>set mipsfpu none</code></dt>
	<dt><code>set mipsfpu auto</code></dt>
	<dt><code>show mipsfpu</code></dt>
	<dd><a name="index-set-mipsfpu"></a>
	<a name="index-show-mipsfpu"></a>
	<a name="index-MIPS-remote-floating-point"></a>
	<a name="index-floating-point_002c-MIPS-remote"></a>
	<p>If your target board does not support the <acronym>MIPS</acronym> floating point
	coprocessor, you should use the command ‘<samp>set mipsfpu none</samp>’ (if you
	need this, you may wish to put the command in your <small>GDB</small> init
	file). This tells <small>GDB</small> how to find the return value of
	functions which return floating point values. It also allows
	<small>GDB</small> to avoid saving the floating point registers when calling
	functions on the board. If you are using a floating point coprocessor
	with only single precision floating point support, as on the <small>R4650</small>
	processor, use the command ‘<samp>set mipsfpu single</samp>’. The default
	double precision floating point coprocessor may be selected using
	‘<samp>set mipsfpu double</samp>’.
	</p>
	<p>In previous versions the only choices were double precision or no
	floating point, so ‘<samp>set mipsfpu on</samp>’ will select double precision
	and ‘<samp>set mipsfpu off</samp>’ will select no floating point.
	</p>
	<p>As usual, you can inquire about the <code>mipsfpu</code> variable with
	‘<samp>show mipsfpu</samp>’.
	</p>
	</dd>
	<dt><code>set timeout <var>seconds</var></code></dt>
	<dt><code>set retransmit-timeout <var>seconds</var></code></dt>
	<dt><code>show timeout</code></dt>
	<dt><code>show retransmit-timeout</code></dt>
	<dd><a name="index-timeout_002c-MIPS-protocol"></a>
	<a name="index-retransmit_002dtimeout_002c-MIPS-protocol"></a>
	<a name="index-set-timeout"></a>
	<a name="index-show-timeout"></a>
	<a name="index-set-retransmit_002dtimeout"></a>
	<a name="index-show-retransmit_002dtimeout"></a>
	<p>You can control the timeout used while waiting for a packet, in the <acronym>MIPS</acronym>
	remote protocol, with the <code>set timeout <var>seconds</var></code> command. The
	default is 5 seconds. Similarly, you can control the timeout used while
	waiting for an acknowledgment of a packet with the <code>set
	retransmit-timeout <var>seconds</var></code> command. The default is 3 seconds.
	You can inspect both values with <code>show timeout</code> and <code>show
	retransmit-timeout</code>. (These commands are <em>only</em> available when
	<small>GDB</small> is configured for ‘<samp>--target=mips-elf</samp>’.)
	</p>
	<p>The timeout set by <code>set timeout</code> does not apply when <small>GDB</small>
	is waiting for your program to stop. In that case, <small>GDB</small> waits
	forever because it has no way of knowing how long the program is going
	to run before stopping.
	</p>
	</dd>
	<dt><code>set syn-garbage-limit <var>num</var></code></dt>
	<dd><a name="index-set-syn_002dgarbage_002dlimit_002c-MIPS-remote"></a>
	<a name="index-synchronize-with-remote-MIPS-target"></a>
	<p>Limit the maximum number of characters <small>GDB</small> should ignore when
	it tries to synchronize with the remote target. The default is 10
	characters. Setting the limit to -1 means there’s no limit.
	</p>
	</dd>
	<dt><code>show syn-garbage-limit</code></dt>
	<dd><a name="index-show-syn_002dgarbage_002dlimit_002c-MIPS-remote"></a>
	<p>Show the current limit on the number of characters to ignore when
	trying to synchronize with the remote system.
	</p>
	</dd>
	<dt><code>set monitor-prompt <var>prompt</var></code></dt>
	<dd><a name="index-set-monitor_002dprompt_002c-MIPS-remote"></a>
	<a name="index-remote-monitor-prompt"></a>
	<p>Tell <small>GDB</small> to expect the specified <var>prompt</var> string from the
	remote monitor. The default depends on the target:
	</p><dl compact="compact">
	<dt>pmon target</dt>
	<dd><p>‘<samp>PMON</samp>’
	</p></dd>
	<dt>ddb target</dt>
	<dd><p>‘<samp>NEC010</samp>’
	</p></dd>
	<dt>lsi target</dt>
	<dd><p>‘<samp>PMON></samp>’
	</p></dd>
	</dl>

	</dd>
	<dt><code>show monitor-prompt</code></dt>
	<dd><a name="index-show-monitor_002dprompt_002c-MIPS-remote"></a>
	<p>Show the current strings <small>GDB</small> expects as the prompt from the
	remote monitor.
	</p>
	</dd>
	<dt><code>set monitor-warnings</code></dt>
	<dd><a name="index-set-monitor_002dwarnings_002c-MIPS-remote"></a>
	<p>Enable or disable monitor warnings about hardware breakpoints. This
	has effect only for the <code>lsi</code> target. When on, <small>GDB</small> will
	display warning messages whose codes are returned by the <code>lsi</code>
	PMON monitor for breakpoint commands.
	</p>
	</dd>
	<dt><code>show monitor-warnings</code></dt>
	<dd><a name="index-show-monitor_002dwarnings_002c-MIPS-remote"></a>
	<p>Show the current setting of printing monitor warnings.
	</p>
	</dd>
	<dt><code>pmon <var>command</var></code></dt>
	<dd><a name="index-pmon_002c-MIPS-remote"></a>
	<a name="index-send-PMON-command"></a>
	<p>This command allows sending an arbitrary <var>command</var> string to the
	monitor. The monitor must be in debug mode for this to work.
	</p></dd>
	</dl>

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