Use riscv-none-elf from Xpack project.

.github/workflows/ci.yml

@@ -18,24 +18,21 @@ jobs:
       - name: Cache Scala
         uses: coursier/cache-action@v5
       - name: Install dependencies
-        run: sudo apt install verilator gcc-riscv64-unknown-elf cmake -y
+        run: |
+          sudo apt install verilator cmake -y
+          wget -q --show-progress https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/download/v14.2.0-2/xpack-riscv-none-elf-gcc-14.2.0-2-linux-x64.tar.gz -O gcc.tar.gz
+          tar xvf gcc.tar.gz --directory=/opt
+          echo "RISCV_TOOL_PATH_PREFIX=/opt/xpack-riscv-none-elf-gcc-14.2.0-2" >> $GITHUB_ENV
       - name: Run Chisel unit tests
         run: sbt 'test'
       - name: Build emulator and SDK
         run: source env.bash && cmake -Bbuild && cd build && make all install
       - name: Run C tests
         run: |
-          # Set environment to find RISC-V compiler
-          export RISCV_TOOL_PATH_PREFIX=~/riscv-embed-gcc
           source env.bash
-
-          # Step into SDK and run tests
           cd sdk && cmake -B build && cd build && make && ctest
       - name: Run multithreaded C tests
         run: |
-          # Set environment to find RISC-V compiler
-          export RISCV_TOOL_PATH_PREFIX=~/riscv-embed-gcc
           source env.bash
-          
           # Run multiple tests with script
           ./scripts/run_multiple_tests.sh

README.md

@@ -11,10 +11,17 @@ For more information on the processor architecture:
 # Tools and installation
 
 ## RISC-V Compiler
-We use the Newlib version of RISC-V GCC which can be installed on Ubuntu with
+We use the `riscv-none-elf-gcc` compiler provided by xPack project. To install this toolchain to `/opt/xpack-riscv-none-elf-gcc-14.2.0-2` perform the following steps.
+
 ```
-sudo apt install gcc-riscv64-unknown-elf
+  wget -q --show-progress https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/download/v14.2.0-2/xpack-riscv-none-elf-gcc-14.2.0-2-linux-x64.tar.gz -O gcc.tar.gz
+  tar xvf gcc.tar.gz --directory=/opt
 ```
+
+Then add `export RISCV_TOOL_PATH_PREFIX=/opt/xpack-riscv-none-elf-gcc-14.2.0-2` to your `~/.bashrc`
+
+There are also versions for macOS and Windows. Refer to the [documentation](https://xpack-dev-tools.github.io/riscv-none-elf-gcc-xpack/) for more information.
+
 ## Verilator
 We use the `verilator` toolchain for running emulations of the core. Install it and check that the version is greater than 4.038.
 

sdk/cmake/riscv-toolchain.cmake

@@ -20,7 +20,7 @@ set(RISCV_HOST_TAG linux)
 set(RISCV_TOOL_PATH $ENV{RISCV_TOOL_PATH_PREFIX} CACHE PATH "RISC-V tool path" FORCE)
 
 set(RISCV_TOOLCHAIN_ROOT "${RISCV_TOOL_PATH}/bin" CACHE PATH "RISC-V compiler path")
-set(RISCV_TOOLCHAIN_PREFIX "riscv64-unknown-elf-" CACHE STRING "RISC-V toolchain prefix")
+set(RISCV_TOOLCHAIN_PREFIX "riscv-none-elf-" CACHE STRING "RISC-V toolchain prefix")
 set(CMAKE_FIND_ROOT_PATH ${RISCV_TOOLCHAIN_ROOT})
 list(APPEND CMAKE_PREFIX_PATH "${RISCV_TOOLCHAIN_ROOT}")