250 lines
7.1 KiB
ReStructuredText
250 lines
7.1 KiB
ReStructuredText
.. include:: /substitutions.rst
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.. todo::
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This is mostly untouched from the original documentation. It does
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not really belong to "quickstart". Also, this needs cleanup.
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.. _organization:
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===================
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Directory Structure
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===================
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This is included for reference, and it's not necessary to know
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all the details at first.
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The general directory layout for NuttX is
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very similar to the directory structure of the Linux kernel -- at
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least at the most superficial layers. At the top level is the main
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makefile and a series of sub-directories identified below and
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discussed in the following paragraphs:
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**Configuration Files**. The NuttX configuration consists of logic
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in processor architecture directories, *chip/SoC* directories, and
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board configuration directories. The complete configuration is
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specified by several settings in the NuttX configuration file.
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- *Processor architecture specific files*. These are the files
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contained in the ``arch/<arch-name>/`` directory and
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are discussed in a paragraph
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`below <#arch-subdirectory-structure>`__. As an example, all ARM
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processor architectures are provided under the ``arch/arm/``
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directory which is selected with the ``CONFIG_ARCH="arm"``
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configuration option.
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Variants of the processor architecture may be provided in
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sub-directories of the Extending this example, the ARMv7-M ARM
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family is supported by logic in ``arch/arm/include/armv7-m``
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and ``arch/arm/src/armv7-m`` directories which are selected by
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the ``CONFIG_ARCH_CORTEXM3=y``, ``CONFIG_ARCH_CORTEXM4=y``, or
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``CONFIG_ARCH_CORTEXM7=y`` configuration options
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- *Chip/SoC specific files*. Each processor architecture is
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embedded in a *System-on-a-Chip* (SoC) architecture. The full
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SoC architecture includes the processor architecture plus
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chip-specific interrupt logic, clocking logic, general purpose
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I/O (GPIO) logic, and specialized, internal peripherals (such
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as UARTs, USB, etc.).
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These chip-specific files are contained within chip-specific
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sub-directories also under the ``arch/<arch-name>/``
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directory and are selected via the ``CONFIG_ARCH_CHIP``
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selection.
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As an example, the STMicro STM32 SoC architecture is based on
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the ARMv7-M processor and is supported by logic in the
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``arch/arm/include/stm32`` and ``arch/arm/src/stm32``
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directories which are selected with the
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``CONFIG_ARCH_CHIP="stm32"`` configuration setting.
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- *Board specific configurations*. In order to be usable, the
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chip must be contained in a board environment. The board
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configuration defines additional properties of the board
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including such things as peripheral LEDs, external peripherals
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(such as networks, USB, etc.).
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These board-specific configuration files can be found in the
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``boards/<arch-name>/<chip-name>/<board-name>/``
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sub-directories and are discussed in a paragraph
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`below <#boards-subdirectory-structure>`__.
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The directory ``boards/arm/stm32/stm32f4disovery/``, as an
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example, holds board-specific logic for the STM32F4 Discovery
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board and is selected via the
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``CONFIG_ARCH_BOARD="stm32f4discovery"`` configuration setting.
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``nuttx/Documentation``
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=======================
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This directory holds the NuttX documentation. It's made with
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the `Sphinx documentation system <https://www.sphinx-doc.org>`_. See the
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README.md file for information on how to build it.
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``nuttx/arch``
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==============
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This sub-directory holds the NuttX supported architectures.
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For details see :doc:`/components/arch/index`.
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``nuttx/binfmt``
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================
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The ``binfmt/`` subdirectory contains logic for loading binaries
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in the file system into memory in a form that can be used to
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execute them.
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``nuttx/audio``
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===============
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The ``audio/`` subdirectory contains the NuttX audio sub-system.
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.. _nuttx_boards:
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``nuttx/boards``
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================
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The ``boards/`` subdirectory contains custom logic and board
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configuration data for each board. These board-specific
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configurations plus the architecture-specific configurations in
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the ``arch/`` subdirectory complete define a customized port of
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NuttX.
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Boards Subdirectory Structure
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-----------------------------
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The ``boards/`` directory contains board specific configuration
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files. Each board must provide a sub-directory <board-name> under
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``boards/<arch-name>/<chip-name>/``.
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See :doc:`/components/boards` for details.
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``nuttx/cmake``
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===============
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This sub-directory holds the NuttX CMake functions.
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For details see :doc:`/components/cmake`.
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``nuttx/crypto``
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================
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This sub-directory holds the NuttX cryptographic sub-system.
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For details see :doc:`/components/crypto`.
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``nuttx/drivers``
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=================
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This directory holds architecture-independent device drivers.
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For details see :doc:`/components/drivers/index`.
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``nuttx/fs``
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============
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This directory contains the NuttX file system. This file system is
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described `below <#NxFileSystem>`__.
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``nuttx/graphics``
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==================
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This directory contains files for graphics/video support under
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NuttX.
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For details see :doc:`/components/nxgraphics/index`.
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``nuttx/include``
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=================
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This directory holds NuttX header files. Standard header files
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file retained in can be included in the *normal* fashion:
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``nuttx/libs/libc``
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===================
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This directory holds a collection of standard libc-like functions
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with custom interfaces into NuttX.
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For details see :doc:`/components/libs/index`.
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``nuttx/mm``
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============
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This is the NuttX memory manager.
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For details see :doc:`/components/mm/index`.
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``nuttx/net``
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=============
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This directory contains the implementation of the NuttX networking
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layer including internal socket APIs.
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For details see :doc:`/components/net/index`.
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``nuttx/openamp``
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=================
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This directory contains OpenAMP support for NuttX.
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For details see :doc:`/components/openamp`.
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``nuttx/pass1``
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===============
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TODO
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``nuttx/sched``
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===============
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The files forming core of the NuttX RTOS reside here.
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``nuttx/syscall``
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=================
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If NuttX is built as a separately compiled kernel (with
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``CONFIG_BUILD_PROTECTED=y`` or ``CONFIG_BUILD_KERNEL=y``), then
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the contents of this directory are built. This directory holds a
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syscall interface that can be used for communication between
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user-mode applications and the kernel-mode RTOS.
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For details see :doc:`/components/syscall`.
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``nuttx/tools``
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===============
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This directory holds a collection of tools and scripts to simplify
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configuring, building and maintaining NuttX.
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Refer to the :doc:`/components/tools/index` page for more
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information about the individual files. Some of these tools are
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discussed below as well in the discussion of `configuring and
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building <#configandbuild>`__ NuttX.
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``nuttx/video``
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===============
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This directory holds support for video sub-system.
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For details see :doc:`/components/video`.
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``nuttx/wireless``
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==================
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This directory holds support for hardware-independent wireless
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support.
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For details see :doc:`/components/wireless`.
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``nuttx/CMakeList.txt``
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=======================
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The top-level ``CMakeList.txt`` file.
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``nuttx/Makefile``
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==================
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The top-level ``Makefile`` in the ``$(TOPDIR)`` directory contains
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all of the top-level control logic to build NuttX.
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