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| <div class="section" id="porting-mynewt-os"> |
| <h1>Porting Mynewt OS<a class="headerlink" href="#porting-mynewt-os" title="Permalink to this headline">¶</a></h1> |
| <div class="toctree-wrapper compound"> |
| </div> |
| <p>This chapter describes how to adapt the Mynewt OS to different |
| platforms.</p> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#description" id="id1">Description</a></p></li> |
| <li><p><a class="reference internal" href="#board-support-package-bsp-dependency" id="id2">Board Support Package (BSP) Dependency</a></p></li> |
| <li><p><a class="reference internal" href="#mcu-dependency" id="id3">MCU Dependency</a></p></li> |
| <li><p><a class="reference internal" href="#mcu-hal" id="id4">MCU HAL</a></p></li> |
| <li><p><a class="reference internal" href="#cpu-core-dependency" id="id5">CPU Core Dependency</a></p></li> |
| </ul> |
| </div> |
| <div class="section" id="description"> |
| <h2><a class="toc-backref" href="#id1">Description</a><a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2> |
| <p>The Mynewt OS is a complete multi-tasking environment with scheduler, |
| time control, buffer management, and synchronization objects. it also |
| includes libraries and services like console, command shell, image |
| manager, bootloader, and file systems etc.</p> |
| <p>Thee majority of this software is platform independent and requires no |
| intervention to run on your platform, but some of the components require |
| support from the underlying platform.</p> |
| <p>The platform dependency of these components can fall into several |
| categories:</p> |
| <ul class="simple"> |
| <li><p><strong>CPU Core Dependencies</strong> – Specific code or configuration to |
| operate the CPU core within your target platform</p></li> |
| <li><p><strong>MCU Dependencies</strong> – Specific code or configuration to operate the |
| MCU or SoC within your target platform</p></li> |
| <li><p><strong>BSP Dependencies</strong> – Specific code or configuration to accommodate |
| the specific layout and functionality of your target platform</p></li> |
| </ul> |
| </div> |
| <div class="section" id="board-support-package-bsp-dependency"> |
| <h2><a class="toc-backref" href="#id2">Board Support Package (BSP) Dependency</a><a class="headerlink" href="#board-support-package-bsp-dependency" title="Permalink to this headline">¶</a></h2> |
| <p>With all of the functionality provided by the core, MCU, and MCU HAL |
| (Hardware Abstraction Layer), there are still some things that must be |
| specified for your particular system. This is provided in Mynewt to |
| allow you the flexibility to design for the exact functionality, |
| peripherals and features that you require in your product.</p> |
| <p>In Mynewt, these settings/components are included in a Board Support |
| Package (BSP). The BSP contains the information specific to running |
| Mynewt on a target platform or hardware board. Mynewt supports some |
| common open source hardware as well as the development boards for some |
| common MCUs. These development systems might be enough for you to get |
| your prototype up and running, but when building a product you are |
| likely going to have your own board which is slightly different from |
| those already supported by Mynewt.</p> |
| <p>For example, you might decide on your system that 16 Kilobytes of flash |
| space in one flash device is reserved for a flash file system. Or on |
| your system you may decide that GPIO pin 5 of the MCU is connected to |
| the system LED. Or you may decide that the OS Tick (the underlying time |
| source for the OS) should run slower than the defaults to conserve |
| battery power. These types of behaviors are specified in the BSP.</p> |
| <p>The information provided in the BSP (what you need to specify to get a |
| complete executable) can vary depending on the MCU and its underlying |
| core architecture. For example, some MCUs have dedicated pins for UART, |
| SPI etc, so there is no configuration required in the BSP when using |
| these peripherals. However some MCUs have a pin multiplexor that allows |
| the UART to be mapped to several different pins. For these MCUs, the BSP |
| must specify if and where the UART pins should appear to match the |
| hardware layout of your system.</p> |
| <ul class="simple"> |
| <li><p>If your BSP is already supported by Mynewt, there is no additional |
| BSP work involved in porting to your platform. You need only to set |
| the <code class="docutils literal notranslate"><span class="pre">bsp</span></code> attribute in your Mynewt target using the <a class="reference internal" href="../../../newt/index.html"><span class="doc">newt command |
| tool</span></a>.</p></li> |
| <li><p>If your BSP is not yet supported by Mynewt, you can add support |
| following the instructions on <a class="reference internal" href="port_bsp.html"><span class="doc">BSP Porting</span></a>.</p></li> |
| </ul> |
| </div> |
| <div class="section" id="mcu-dependency"> |
| <h2><a class="toc-backref" href="#id3">MCU Dependency</a><a class="headerlink" href="#mcu-dependency" title="Permalink to this headline">¶</a></h2> |
| <p>Some OS code depends on the MCU or SoC that the system contains. For |
| example, the MCU may specify the potential memory map of the system - |
| where code and data can reside.</p> |
| <ul class="simple"> |
| <li><p>If your MCU is already supported by Mynewt, there is no additional |
| MCU work involved in porting to your platform. You need only to set |
| the <code class="docutils literal notranslate"><span class="pre">arch</span></code> attribute in your Mynewt target using the <a class="reference internal" href="../../../newt/index.html"><span class="doc">newt command |
| tool</span></a>.</p></li> |
| <li><p>If your MCU is not yet supported by Mynewt, you can add support |
| following the instructions in <a class="reference internal" href="port_mcu.html"><span class="doc">Porting Mynewt to a new MCU</span></a>.</p></li> |
| </ul> |
| </div> |
| <div class="section" id="mcu-hal"> |
| <h2><a class="toc-backref" href="#id4">MCU HAL</a><a class="headerlink" href="#mcu-hal" title="Permalink to this headline">¶</a></h2> |
| <p>Mynewt’s architecture supports a hardware abstraction layer (HAL) for |
| common on or off-chip MCU peripherals such as GPIO, UARTs, flash memory |
| etc. Even if your MCU is supported for the core OS, you may find that |
| you need to implement the HAL functionality for a new peripheral. For a |
| description of the HAL abstraction and implementation information, see |
| the <a class="reference internal" href="../../modules/hal/hal.html"><span class="doc">HAL API</span></a></p> |
| </div> |
| <div class="section" id="cpu-core-dependency"> |
| <h2><a class="toc-backref" href="#id5">CPU Core Dependency</a><a class="headerlink" href="#cpu-core-dependency" title="Permalink to this headline">¶</a></h2> |
| <p>Some OS code depends on the CPU core that your system is using. For |
| example, a given CPU core has a specific assembly language instruction |
| set, and may require special cross compiler or compiler settings to use |
| the appropriate instruction set.</p> |
| <ul class="simple"> |
| <li><p>If your CPU architecture is already supported by Mynewt, there is no |
| CPU core work involved in porting to your platform. You need only to |
| set the <code class="docutils literal notranslate"><span class="pre">arch</span></code> and <code class="docutils literal notranslate"><span class="pre">compiler</span></code> attributes in your Mynewt target |
| using the <a class="reference internal" href="../../../newt/index.html"><span class="doc">newt command tool</span></a>.</p></li> |
| <li><p>If your CPU architecture is not supported by Mynewt, you can add |
| support following the instructions on <a class="reference internal" href="port_cpu.html"><span class="doc">Porting Mynewt to a new CPU Architecture</span></a>.</p></li> |
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