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<title>10.2.4 Using the instruction and data caches  </title>

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  <a name="1204685"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">10.2.4 	 Using the instruction and data caches</font>
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  <a name="1204686"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">If either of the ST20 instruction or data caches are enabled, extra care must be taken when handling relocatable code units. If the area of memory that the RCU resides in is cached then it is important to maintain cache coherency.</font>
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  <a name="1204687"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">This is especially important when replacing one RCU with another. In this situation the following technique should be used. After calling <font size=2 face=Courier><strong>rcu_deinit()</strong></font> and there are no further accesses to the RCU's memory planned, the instruction cache should be invalidated and the data cache should be flushed. This purges all data or instructions belonging to the old RCU from the cache. The new RCU can then be loaded safely. See the <em>OS20 User Manual</em>, chapter <em>Caches</em> for further details.</font>
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