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<a name="1204506"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">15.2 Compiling OS20</font>
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<a name="1204510"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">There are a number of extensions that are not supported by the pre-built OS20 kernel. These extensions generally provide useful services but at a cost, both in speed of execution and memory footprint, that may be unacceptably high for some applications. The extensions are most useful when debugging, because some of them give greater visibility of what OS20 is doing internally, and should be used with caution in production systems.</font>
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<a name="1204514"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The standard kernel also contains workarounds to silicon defects that do not affect the whole ST20 family of processors. Therefore it may be beneficial to disable a workaround if it is does not affect the target device.</font>
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<a name="1204518"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The source for OS20 is located in <font size=2 face=Courier><strong>$ST20ROOT/src/os20.</strong></font> Copy this directory locally and set an environment variable <font size=2 face=Courier><strong>MYOS20</strong></font> to point to the copied directory. OS20 is provided with makefiles for Sun <font size=2 face=Courier><strong>make</strong></font> under Solaris, GNU⌨️ 快捷键说明
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