Microchip Polarfile (MPFS)¶
RV64 64-bit RISC-V multiprocessor-based Microcontroller Subsystem (MPFS025T, MPFS095T, MPFS160T, MPFS250T, MPFS460T)
MPFS Toolchain¶
A generic RISC-V toolchain can be used to build MPFS projects. Like: https://xpack.github.io/riscv-none-embed-gcc or https://github.com/sifive/freedom-tools/releases
Booting¶
The NuttX port for now relies on HSS bootloader to carry on some hardware initializations.
Building and flashing¶
First make sure that hss-payload-generator is installed.
Available from: https://github.com/polarfire-soc/hart-software-services
This tool is used to convert the ELF/bin to a compatible HSS payload image
Configure the NuttX project: ./tools/configure.sh icicle:nsh
Run make to build the project.
Create HSS payload bin:
hss-payload-generator -v -c hss-nuttx.yml payload.bin
Debugging with OpenOCD¶
Compatible OpenOCD and configs can be downloaded from: https://www.microsemi.com/product-directory/design-tools/4879-softconsole#downloads
OpenOCD can then be used:
openocd -c "set DEVICE MPFS" --file board/microsemi-riscv.cfg
Peripheral Support¶
The following list indicates the state of peripherals’ support in NuttX:
Peripheral |
Support |
NOTES |
|---|---|---|
GPIO |
Yes |
|
MMUART |
Yes |
Uart mode only |
SPI |
Yes |
|
I2C |
Yes |
|
eMMC SD/SDIO |
Yes |
eMMC not fully tested |
Timers |
No |
|
Watchdog |
No |
|
RTC |
No |
|
CAN |
No |
|
eNVM |
No |
|
USB |
No |