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<title>D.2 All chips with DCU2 diagnostic controller</title>
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<h2>
<a name="1142946"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.2 All chips with DCU2 diagnostic controller</font>
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<h3>
<a name="1142947"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.2.1 Incorrect match on data breakpoints</font>
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<a name="1142948"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">DCU data valued breakpoints match on all address greater than or equal to the parameter value rather than only the value given.</font>
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<a name="1142949"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Hence the command</font>
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<a name="1142950"> </a><font size=2 face=Courier><strong>break var -h -d 24<br></strong></font>
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<a name="1142951"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">will match on all writes to addresses that are greater or equal to <font size=2 face=Courier><strong>var</strong></font> whose data value is 24.</font>
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<h3>
<a name="1142952"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.2.2 Incoherent view of memory when both dcache and jumptrace enabled bug INSbl05750</font>
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<a name="1142953"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">When jump tracing is enabled all accesses to memory that are made via the DCU have the device bit set. When Dcache is enabled, the device bit means that CPU memory accesses are not cached. Consequently when both of these are enabled the DCU view of memory is not cache coherent. This has the effect that the jump trace may not contain a complete set of records.</font>
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<h5>
<a name="1142954"> </a><i><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Work-arounds</font></i>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142955"> </a>Turn off the debug library using the <font size=2 face=Courier><strong>informs</strong></font> command when jump tracing.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142956"> </a>Avoid mixing jumptrace and viewing memory or variables.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142957"> </a>Do not use I/O (for example, <font size=2 face=Courier><strong>printf()</strong></font>) when jump tracing.</font></p>
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<h3>
<a name="1142958"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.2.3 DCU bug INSbl07059</font>
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<a name="1142959"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">There is a DCU bug whereby an access by the CPU to a DCU register may result in the wrong value being returned, depending on the memory accesses that may have preceded the DCU access. To work round this the following code should be executed prior to the DCU access:</font>
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<a name="1142960"> </a><font size=2 face=Courier><strong>ldlp 0; ldnl 0; adc 0; pop ;<br></strong></font>
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<a name="1142961"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">For example, to read the DCU Control register:</font>
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<a name="1142962"> </a><font size=2 face=Courier><strong>ldc 0x3004 ;<br>ldlp 0; ldnl 0; adc 0; pop ;<br>ldnl 0;<br></strong></font>
<h3>
<a name="1144465"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.2.4 DCU bug INSbl20569</font>
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<a name="1144468"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">When trace is disabled with a '<font size=2 face=Courier><strong>break</strong></font> ... <font size=2 face=Courier><strong>-traceoff -notrap</strong></font>' command, jump trace cannot be re-enabled until the traphandler has been entered. This type of trace off action may be required when the intention is to disable and re-enable trace to trace only a chosen section of code, or to miss out tracing of, for example, a <strong>printf</strong>. To work-around this problem replace the <font size=2 face=Courier><strong>-notrap</strong></font> option with <font size=2 face=Courier><strong>-continue</strong></font>.</font>
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