开源RISC-V处理器(蜂鸟E203)学习（一）修改仿真环境（vcs+verdi）
本帖最后由 塞巴斯蒂安 于 2022-2-23 21:14 编辑1.简述.
这里不详细介绍risc-v和蜂鸟e203，大家应该都比较了解。蜂鸟e203工程比较完善，也有一本书介绍，讲解还是非常详细的，如果以后想从事数字IC或者想学习risc-v，蜂鸟e203适合入门学习。
但是e203工程中的验证环境是iverilog，而实际工作常用vcs和verdi，个人觉得使用vcs环境学习比较好一些，如果已经工作了，习惯使用vcs，业余时间在研究e203时需要切换成iverilog，十分不方便。这里不是不支持开源工具，主要是工作后时间和精力有限，需要尽量节省学习成本。
今天先分享怎么修改蜂鸟e203的环境，在我之前分享的EDA环境使用vcs+verdi跑起来。
2.Git下载
打开terminal，使用下面命令进行下载，记得虚拟机连接网络。
git clone https://github.com/SI-RISCV/e200_opensource.git下面就是e203项目的目录，我们现在进入vsim（验证目录），其他先不管，后面的分享会慢慢介绍到。
3.修改环境
进入到仿真的bin目录下，打开run.makefile
仿真脚本修改如下：
1）修改仿真工具，添加vcs仿真选项，“LD_LIBRARY_PATH”是novas的路径，根据自己环境修改下。
2）添加verdi环境
修改好的仿真环境如下：
RUN_DIR := ${PWD}
TESTCASE := ${RUN_DIR}/../../riscv-tools/riscv-tests/isa/generated/rv32ui-p-addi
DUMPWAVE := 1
VSRC_DIR := ${RUN_DIR}/../install/rtl
VTB_DIR := ${RUN_DIR}/../install/tb
TESTNAME := $(notdir $(patsubst %.dump,%,${TESTCASE}.dump))
TEST_RUNDIR:= ${TESTNAME}
RTL_V_FILES := $(wildcard ${VSRC_DIR}/*/*.v)
TB_V_FILES := $(wildcard ${VTB_DIR}/*.v)
# The following portion is depending on the EDA tools you are using, Please add them by yourself according to your EDA vendors
SIM_TOOL := vcs#To-ADD: to add the simulatoin tool
#SIM_TOOL := iverilog # this is a free solution here to use iverilog to compile the code
SIM_OPTIONS := -timescale=1ns/1ns -fsdb-full64-R+vc+v2k-sverilog-debug_all -P ${LD_LIBRARY_PATH}/novas.tab${LD_LIBRARY_PATH}/pli.a -l vcs.log +incdir+${VSRC_DIR}/core/+${VSRC_DIR}/perips/ #To-ADD: to add the simulatoin tool options
#SIM_OPTIONS := -o vvp.exec -I "${VSRC_DIR}/core/" -I "${VSRC_DIR}/perips/" -D DISABLE_SV_ASSERTION=1 -g2005
# This is a free solution here to use iverilog to compile the code. Please NOTE!!!!
#
# Note:
# Here we add a macro "DISABLE_SV_ASSERTION" to disable the system-verilog coded
# assertion in the RTL code because iverilog cannot support that syntax, if you
# use other EDA tools which support the systemverilog, you should not add this macro "DISABLE_SV_ASSERTION".
#
# Here we didnt add macro "ENABLE_TB_FORCE"
# that macro was used to enable the random interrupt and bus-error insertion to make
# more intensive test in e200_opensource/tb/tb_top.v.
# Although the test become more intensive, the drawback is it makes the regression
# simulation running very slower, so by default now it is turned off.
# If you want to turn on them without caring the the regression speed,
# you can just add macro `ENABLE_TB_FORCE` here in command line.
SIM_EXEC := ../simv#To-ADD: to add the simulatoin executable
#SIM_EXEC := vvp ${RUN_DIR}/vvp.exec -none # The free vvp is tooooo slow to run, so just comment it out, and replaced with the fake way below
#SIM_EXEC := echo "Test Result Summary: PASS" # This is a fake run to just direct print PASS info to the log, the user need to actually replace it to the real EDA command
WAV_TOOL := verdi#To-ADD: to add the waveform tool
WAV_OPTIONS := -2001 -sv -top tb_top +incdir+${VSRC_DIR}/core/+${VSRC_DIR}/perips/#To-ADD: to add the waveform tool options
WAV_PFIX := #To-ADD: to add the waveform file postfix
all: run
compile.flg: ${RTL_V_FILES} ${TB_V_FILES}
@-rm -rf compile.flg
${SIM_TOOL} ${SIM_OPTIONS}${RTL_V_FILES} ${TB_V_FILES} ;
touch compile.flg
compile: compile.flg
wave:
#gvim -p ${TESTCASE}.spike.log ${TESTCASE}.dump &
#${WAV_TOOL} ${WAV_OPTIONS} &
${WAV_TOOL} ${WAV_OPTIONS} ${RTL_V_FILES} ${TB_V_FILES} &
run: compile
rm -rf ${TEST_RUNDIR}
mkdir ${TEST_RUNDIR}
cd ${TEST_RUNDIR}; ${SIM_EXEC} +DUMPWAVE=${DUMPWAVE} +TESTCASE=${TESTCASE} |& tee ${TESTNAME}.log; cd ${RUN_DIR};
.PHONY: run clean all
4.修改tb
进入tb目录，打开tb_top.v
加入以下代码，这个是产生verdi使用的波形文件。
initial begin
$value$plusargs("DUMPWAVE=%d",dumpwave);
if(dumpwave != 0)begin
// To add your waveform generation function
$fsdbDumpfile("ware.fsdb");
$fsdbDumpvars("+all");
end
end
5.运行仿真
进入到vsim目录下，先执行下面命令，会生成install目录，这里面是copy过来源代码和tb。
make install CORE=e203执行下面命令，执行仿真，仿真结束后打印如下图的“PASS”。
运行以下命令启动verdi；
make wave6.总结
修改仿真环境比较简单，现在可以使用Verdi去学习RTL代码，这样效率会高很多。这部分基于我之前分享的EDA环境进行的，以后也是基于这个环境，所以想一起学习的盆友，最好使用我的环境，公众号后台回复：EDA虚拟机可以获得完整EDA环境（虚拟机）。这个修改好的E203工程我也上传到gitee，后面修改的工程也会上传到gitee：
https://gitee.com/Core_Kingdom/e203_mo
完
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