RISCV_picorv32_fpga

##building RISC-V from scratch, using Linux or WSL

sudo apt-get update
sudo apt-get install autoconf automake autotools-dev curl python3 python3-pip libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev ninja-build git cmake libglib2.0-dev
git clone https://github.com/riscv/riscv-gnu-toolchain
cd riscv-gnu-toolchain/
mkdir build/
cd build
sudo mkdir /opt/riscv32im
sudo chown $USER /opt/riscv32im
./configure --with-arch=rv32im --prefix=/opt/riscv32im
make -j$(nproc)

For other architectures or variations of RISC-V

Command	ISA
./configure --with-arch=rv32i --prefix=/opt/riscv32i/	RV32I
./configure --with-arch=rv32ic --prefix=/opt/riscv32ic/	RV32IC
./configure --with-arch=rv32im --prefix=/opt/riscv32im/	RV32IM
./configure --with-arch=rv32imc --prefix=/opt/riscv32imc/	RV32IMC

Other Linux and Windows precompiled Toolchains

- https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/ for mingw64
- https://gnutoolchains.com/risc-v/ 

Build the firmware

git clone https://gitea.squirrelnut.synology.me:5001/FPGALover/RISCV_picorv32_fpga 
cd  RISCV_picorv32_fpga/sw
make clean
make firmware/firmware.fpga
cp firmware/Memory.v_toplevel_memory_1_symbol* ../rtl/DE0-NANO

Now you can compile or synthesize the FPGA harware using Quartus or any other Design tool