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| | +--index.html - Local documentation access (after rebuild).
+--ext/ - External libraries, not part of ChibiOS/RT.
+--os/ - ChibiOS components.
+ | +--abstractions/ - API emulator wrappers.
+ | | +--cmsis-os - CMSIS OS emulation layer for RT (ARMCMx port only).
+ | | +--nasa-osal - NASA Operating System Abstraction Layer for RT.
| +--common/ - Shared OS modules.
| +--common/ext/ - Vendor files used by the OS.
| +--common/oslib/ - RTOS modules usable by both RT and NIL.