# Weekend group

## 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 verilator

`sudo apt install 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
```

## may be install sv2v

`https://github.com/zachjs/sv2v`

## install ninja

`sudo apt-get install -y ninja-build`

## Gen quasar core

```bash
git clone https://github.com/Lampro-Mellon/Quasar.git
cd tools
vim configs/quasar.config # to config the core
make clean
make conf
make sbt_
# Quasar/generated_rtl/quasar_wrapper.sv
```

## install Bit-Vector

```bash
wget https://cpan.metacpan.org/authors/id/S/ST/STBEY/Bit-Vector-7.4.tar.gz
tar -xvf
cd 
perl Makefile.PL
make 
sudo make install
```

## build and install riscv tools

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

```bash
# build 64bit
sudo make clean
./configure --prefix=/opt/riscv 
sudo make -j12

# build 64bit and 32bit
sudo make clean
./configure --prefix=/opt/riscv --with-arch=rv32gc --with-abi=ilp32d --enable-multilib
sudo make -j12
```

* 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
```

## tips

* jtag的reset引脚要设置正确 jtag_trst_n 低电平复位
* 仿真的时候jtag的tclk不能太快，要低于soc的clk
* SweRV启动/复位后程序从`reset_vec`(0x80000000)开始，遇到错误（code=0），就会跳到mtvec(中断向量表)指示的地址
* 物理仿真的时候 adapter speed 不能太快
* data段放到0x200太小，GDB调试RISCV至少要4K的程序空间？
* soc的ram和rom直接接到了lsu和ifu，和DCCM/ICCM无关
* program.hex 用于 $readmemh 必须以空行结束

## Todo

* gdb怎么复位soc
* gdb没有把程序加载到mem，ifu还是用老代码
* mem分bank后，怎么加载，用于仿真=>for循环分别加载
* Quasar升级scala版本发现openocd运行不正常