RISC-V & FreeRTOS

Installing VectorBlox ORCA Core and RISC-V Tools

Download the source from https://github.com/VectorBlox/orca using git.
In this guide the install locations /opt/orca/ and /opt/riscv/ were chosen.
Open a terminal window and run:
$ git clone https://github.com/VectorBlox/orca.git /opt/orca

$ cd /opt/orca/tools/riscv-toolchain/

$ export RISCV_INSTALL="/opt/riscv"

$ ./build-toolchain.sh
Info: This may take a while.
Finally add the RISC-V tools to your path:
$ nano ~/.profile

export PATH=/opt/riscv/bin:$PATH

Download RISC-V Example and unpack.
Open a terminal window, change directory to either riscv_freertos_example/riscv or riscv_freertos_example/riscv_freertos and run:
$ make
The folder out now contains the bootrom.mif (Memory Initalization File).
Copy the bootrom.mif to riscv_freertos_example/quartus

Open Quartus Prime and load the project under riscv_freertos_example/quartus.
INFO: This Quartus project is specific to the SpiderSoM - for the MX10 the pin assignment has to be changed.
Open Assignments -> Settings -> IP Settings -> IP Catalog Search Locations and add the search path to ORCA.
If ORCA was installed under /opt/orca/ then use as search path: /opt/orca/**/*
(Optional) Open the Platform Designer with the Qsys file
- (Optional) Under System Contents, select onchip_memory2_0 and under memory initialization provide your bootrom.mif file. (The default is to use the bootrom.mif in the quartus folder)
- (Optional) Save and Generate the Qsys system.
Compile the project and program it onto the FPGA using either OpenOCD or USB-Blaster.

After programming:

If the red LED on the module starts blinking once per second, the FPGA was programmed successfully.
If the green LED on the module starts blinking once every two seconds, the RISC-V Core and its firmware is working.
PMod J2 will output a binary counter.
You can use the UART of the FPGA by using standard tools such as picocom:
$ sudo picocom -b 115200 /dev/ttyACM0
- Every character written is looped back and should be displayed on the terminal.