90 lines
2.9 KiB
ReStructuredText
90 lines
2.9 KiB
ReStructuredText
===========================
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Microchip Polarfile (MPFS)
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===========================
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RV64 64-bit RISC-V multiprocessor-based Microcontroller Subsystem
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(MPFS025T, MPFS095T, MPFS160T, MPFS250T, MPFS460T)
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MPFS Toolchain
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==============
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A generic RISC-V toolchain can be used to build MPFS projects.
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Like: https://xpack.github.io/riscv-none-embed-gcc or https://github.com/sifive/freedom-tools/releases
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Booting
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=======
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The NuttX works as a standalone operating system that may initialize all the required clocks and
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peripherals including DDR memory. Alternatively, the vendor's HSS bootloader may be used instead to
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perform all the initialization steps.
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Building and flashing
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=====================
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Configure the NuttX project: ``./tools/configure.sh icicle:nsh``
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Run ``make`` to build the project.
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If NuttX is built as a standalone OS with the config option CONFIG_MPFS_BOOTLOADER set, it's important
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to note that the image size is very limited: only (128K - 256) bytes. 256 bytes are reserved for the
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header that must be prepended into the NuttX binary. This binary is called hss-envm-wrapper-bm1-dummySbic.bin
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and may be found from the vendor's HSS implementation. Moreover, after prepending the 256-byte header,
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the LMA section needs to be adjusted, for example::
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riscv64-unknown-elf-objcopy -I binary -O ihex --change-section-lma *+0x20220000 nuttx.bin nuttx.hex
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The output binary nuttx.hex may be flashed with the LiberoSoc tool.
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The tool is available from: https://www.microchip.com/en-us/products/fpgas-and-plds/fpga-and-soc-design-tools/fpga/libero-software-later-versions#Documents%20and%20Downloads
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There's an alternative way to use NuttX, without the CONFIG_MPFS_BOOTLOADER option set. This expects the
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HSS bootloader sets up the system (memories, caches, initializes clocks etc.).
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First make sure that ``hss-payload-generator`` is installed.
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Available from: https://github.com/polarfire-soc/hart-software-services
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This tool is used to convert the ELF/bin to a compatible HSS payload image
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Create HSS payload bin::
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hss-payload-generator -v -c hss-nuttx.yml payload.bin
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Debugging with OpenOCD
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======================
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Compatible OpenOCD and configs can be downloaded from:
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https://www.microsemi.com/product-directory/design-tools/4879-softconsole#downloads
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OpenOCD can then be used::
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openocd -c "set DEVICE MPFS" --file board/microsemi-riscv.cfg
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Peripheral Support
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==================
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The following list indicates the state of peripherals' support in NuttX:
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============ ======= =====
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Peripheral Support NOTES
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============ ======= =====
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GPIO Yes
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MMUART Yes Uart mode only
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SPI Yes
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I2C Yes
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eMMC SD/SDIO Yes No PHY training
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Timers No
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Watchdog No
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RTC No
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CAN No
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eNVM No
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USB No
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============ ======= =====
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Supported Boards
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================
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.. toctree::
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:glob:
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:maxdepth: 1
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boards/*/*
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