N3_sub/modules/ChibiOS/os

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*** ChibiOS products directory organization ***
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--{root} - Distribution directory.
+--os/ - ChibiOS products, this directory.
| +--rt/ - ChibiOS/RT product.
| | +--include/ - RT kernel headers.
| | +--src/ - RT kernel sources.
| | +--templates/ - RT kernel port template files.
| | +--ports/ - RT kernel port files.
| | +--osal/ - RT kernel OSAL module for HAL interface.
| +--nil/ - ChibiOS/NIL product.
| | +--include/ - Nil kernel headers.
| | +--src/ - Nil kernel sources.
| | +--templates/ - Nil kernel port template files.
| | +--ports/ - Nil kernel port files.
| | +--osal/ - Nil kernel OSAL module for HAL interface.
| +--hal/ - ChibiOS/HAL product.
| | +--include/ - HAL high level headers.
| | +--src/ - HAL high level sources.
| | +--templates/ - HAL port template files.
| | +--ports/ - HAL port files (low level drivers implementations).
| | +--boards/ - HAL board files.
| +--common/ - Files used by multiple ChibiOS products.
| | +--ports - Common port files for various architectures and
| | compilers.
| +--various/ - Various portable support files.
| +--ext/ - Vendor files used by ChibiOS products.