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| <li class="toctree-l4"><a class="reference internal" href="#mpfs-toolchain">MPFS Toolchain</a></li> |
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| <section id="microchip-polarfire-mpfs"> |
| <h1>Microchip Polarfire (MPFS)<a class="headerlink" href="#microchip-polarfire-mpfs" title="Permalink to this heading"></a></h1> |
| <p>RV64 64-bit RISC-V multiprocessor-based Microcontroller Subsystem |
| (MPFS025T, MPFS095T, MPFS160T, MPFS250T, MPFS460T)</p> |
| <section id="mpfs-toolchain"> |
| <h2>MPFS Toolchain<a class="headerlink" href="#mpfs-toolchain" title="Permalink to this heading"></a></h2> |
| <p>A generic RISC-V toolchain can be used to build MPFS projects. |
| Like: <a class="reference external" href="https://xpack.github.io/riscv-none-embed-gcc">https://xpack.github.io/riscv-none-embed-gcc</a> or <a class="reference external" href="https://github.com/sifive/freedom-tools/releases">https://github.com/sifive/freedom-tools/releases</a></p> |
| </section> |
| <section id="booting"> |
| <h2>Booting<a class="headerlink" href="#booting" title="Permalink to this heading"></a></h2> |
| <p>The NuttX works as a standalone operating system that may initialize all the required clocks and |
| peripherals including DDR memory. Alternatively, the vendor’s HSS bootloader may be used instead to |
| perform all the initialization steps.</p> |
| </section> |
| <section id="building-and-flashing"> |
| <h2>Building and flashing<a class="headerlink" href="#building-and-flashing" title="Permalink to this heading"></a></h2> |
| <p>Configure the NuttX project: <code class="docutils literal notranslate"><span class="pre">./tools/configure.sh</span> <span class="pre">icicle:nsh</span></code> |
| Run <code class="docutils literal notranslate"><span class="pre">make</span></code> to build the project.</p> |
| <p>If NuttX is built as a standalone OS with the config option CONFIG_MPFS_BOOTLOADER set, it’s important |
| to note that the image size is very limited: only (128K - 256) bytes. 256 bytes are reserved for the |
| header that must be prepended into the NuttX binary. This binary is called hss-envm-wrapper-bm1-dummySbic.bin |
| and may be found from the vendor’s HSS implementation. Moreover, after prepending the 256-byte header, |
| the LMA section needs to be adjusted, for example:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>riscv64-unknown-elf-objcopy -I binary -O ihex --change-section-lma *+0x20220000 nuttx.bin nuttx.hex |
| </pre></div> |
| </div> |
| <p>The output binary nuttx.hex may be flashed with the LiberoSoc tool. |
| The tool is available from: <a class="reference external" href="https://www.microchip.com/en-us/products/fpgas-and-plds/fpga-and-soc-design-tools/fpga/libero-software-later-versions#Documents%20and%20Downloads">https://www.microchip.com/en-us/products/fpgas-and-plds/fpga-and-soc-design-tools/fpga/libero-software-later-versions#Documents%20and%20Downloads</a></p> |
| <p>There’s an alternative way to use NuttX, without the CONFIG_MPFS_BOOTLOADER option set. This expects the |
| HSS bootloader sets up the system (memories, caches, initializes clocks etc.). |
| First make sure that <code class="docutils literal notranslate"><span class="pre">hss-payload-generator</span></code> is installed. |
| Available from: <a class="reference external" href="https://github.com/polarfire-soc/hart-software-services">https://github.com/polarfire-soc/hart-software-services</a></p> |
| <p>This tool is used to convert the ELF/bin to a compatible HSS payload image</p> |
| <p>Create HSS payload bin:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>hss-payload-generator -v -c hss-nuttx.yml payload.bin |
| </pre></div> |
| </div> |
| </section> |
| <section id="debugging-with-openocd"> |
| <h2>Debugging with OpenOCD<a class="headerlink" href="#debugging-with-openocd" title="Permalink to this heading"></a></h2> |
| <p>Compatible OpenOCD and configs can be downloaded from: |
| <a class="reference external" href="https://www.microsemi.com/product-directory/design-tools/4879-softconsole#downloads">https://www.microsemi.com/product-directory/design-tools/4879-softconsole#downloads</a></p> |
| <p>OpenOCD can then be used:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>openocd -c "set DEVICE MPFS" --file board/microsemi-riscv.cfg |
| </pre></div> |
| </div> |
| </section> |
| <section id="peripheral-support"> |
| <h2>Peripheral Support<a class="headerlink" href="#peripheral-support" title="Permalink to this heading"></a></h2> |
| <p>The following list indicates the state of peripherals’ support in NuttX:</p> |
| <table class="docutils align-default"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Peripheral</p></th> |
| <th class="head"><p>Support</p></th> |
| <th class="head"><p>NOTES</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>GPIO</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>MMUART</p></td> |
| <td><p>Yes</p></td> |
| <td><p>Uart mode only</p></td> |
| </tr> |
| <tr class="row-even"><td><p>SPI</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>I2C</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>eMMC SD/SDIO</p></td> |
| <td><p>Yes</p></td> |
| <td><p>No PHY training</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>USB</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>Ethernet MAC</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>Timers</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>Watchdog</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>RTC</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>CAN</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>eNVM</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| </section> |
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