rocket_chip_vpu

the repository contains VPU source code writen in Chisel, corresponding to rocket-chip and patch for rocket-chip.

• VPU implementation is base on 0.8-release RVV SPEC.
• patch for rocket-chip is base on tag v1.2.6.

Usage

checkout tag v1.2.6 of rocket-chip

  $ git clone https://github.com/chipsalliance/rocket-chip.git
  $ cd rocket-chip
  $ git checkout v1.2.6
  $ git submodule update --init --recursive

Set up rocket-chip environment (for Ubuntu)

Install riscv-gnu-toolchain

checkout riscv-gnu-toolchain rvv-0.8.x branch

  $ git clone https://github.com/riscv/riscv-gnu-toolchain.git
  $ cd riscv-gnu-toolchain
  $ git checkout rvv-0.8.x
  $ git submodule update --init --recursive

install riscv-gnu-toolchain prerequisites describes:

  $ sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev

install riscv-gnu-toolchain

  $ export RISCV=/path/to/install/riscv-gnu-toolchain
  $ ./configure --prefix=$RISCV
  $ make

Set up environment for chisel3

install sbt for chisel3

  $ sudo apt-get install default-jdk
  $ echo "deb https://dl.bintray.com/sbt/debian /" | sudo tee -a /etc/  apt/$ sources.list.d/sbt.list$   
  $ sudo apt-key adv --keys$ erve  r hkp://keyserver.ubuntu.com:80 --rec  v $   642AC823$   
  $ sudo apt-get update
  $ sudo apt-get install sbt

install verilator, optional, which will be auto installed when running simulation in rocket-chip/emulator

  $ sudo apt-get install git make autoconf g++ flex bison
  $ git clone http://git.veripool.org/git/verilator
  $ git pull
  $ git checkout v4.016
  $ unset VERILATOR_ROOT
  $ autoconf
  $ ./configure
  $ make
  $ sudo make install

copy and apply the patch to rocket-chip

  $ cd rocket_chip_vpu
  $ cp 0001-feat-integrate-VPU-which-is-based-on-0.8-release-SPE.patch /path/to/clone/rocket-chip
  $ cd /path/to/clone/rocket-chip
  $ git am 0001-feat-integrate-VPU-which-is-based-on-0.8-release-SPE.patch

make verilog

first copy vpu folder to rocket-chip

  $ cp -R vpu /path/to/clone/rocket-chip

then make verilog

  $ cd /patch/to/clone/rocket-chip/vsim
  $ make verilog CONFIG=VPUConfig

compile VPU only (optional)

VPU depends on hardfloat repo.
To compile VPU, there are three ways to supply source files.

• the first way is to copy all scala files to vpu/src/main/scala/hardfloat

  $ cd vpu
  $ mkdir -p src/scala/main/hardfloat
  $ cp /path/to/clone/hardfloat/src/main/scala/* src/scala/main/hardfloat
  $ make verilog

• the second way is to depend on remote repo, which is writen in build.sbt

  $ cd vpu
  $ make verilog

• the last way is to place hardfloat repo in rocket_chip_vpu/vpu

  $ git clone https://github.com/ucb-bar/berkeley-hardfloat.git
  $ sed -i '62,63s/^\/\///g' vpu/build.sbt
  $ cd vpu
  $ make verilog