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+Subdirectories are organized as follows:
+
+kernel: Architecture-independent kernel code
+ppe42: Kernel code that is common for all ppe42 instances
+std: External interrupt support for standard ppe42 instances (SBE, CME, etc.)
+gpe: External interrupt support for ppe42 instances residing in the OCC complex
+ppe: Support for ppe42 instances that do not require or have external interrupts
+trace: Kernel trace support
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