# Demo

## helloworld

This a demo for llvm build and sim with verilator.

## jtag

This is a demo of jtag simulation by openocd running on verilator.

## install openocd

```shell
git clone https://github.com/riscv/riscv-openocd.git
cd riscv-openocd
./bootstrap
./configure --prefix=$RISCV --enable-remote-bitbang --enable-jtag_vpi --enable-ftdi --enable-jlink
make
sudo make install
```

## build and install riscv tools

* Opetion1 :https://github.com/riscv-collab/riscv-gnu-toolchain.git
* Opetion2 :  

```bash
sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev libusb-1.0-0-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev device-tree-compiler pkg-config libexpat-dev libfl-dev
git clone https://github.com/chipsalliance/rocket-tools.git
git submodule update --init --recursive
# riscv-isa-sim and openocd may be checkout to main branch to avoid compile error
sudo su
export RISCV=/opt/riscv
export MAKEFLAGS="-j12"
./build-rv32ima.sh
```