rocket-chip verilator@ubuntu20.04验证环境操作指南

rocket-chip verilator@ubuntu20.04验证环境操作指南
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rocket-tools版本号
* (HEAD detached at 2022.12.26)
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export RISCV=/home/cad/RISCV
./build.sh
./build-rv32ima.sh
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rocket-chip版本号：
commit 281e5c8f2e1cca68439fe04799d7be855db92517
Author: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Date:   Tue Jul 25 16:55:52 2023 +0800

    PTW: set ae_ptw for out-of-range non-leaf PTEs (#3407) (#3410)
    
    For PTEs whose physical address is out-of-range, we need to set
    `ae_ptw` instead of `ae_final` to raise access-fault.
    
    Because non-leaf PTEs will not have R or X bits set, `ae_final`
    will be overrided by page-fault exceptions.
    
    (cherry picked from commit b8dad7f5a73396f95e68a4dd2b4bdab171ba28e5)
    
    Co-authored-by: Yinan Xu
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git checkout 281e5c8f -f
git submodule update
git show
cd rocket-chip
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cd emulator
make
 it will automatically donwload verilator-4.226.tar.gz and use it for compile tools
 it will generate  
 emulator-freechips.rocketchip.system-freechips.rocketchip.system.DefaultConfig
 then
make run-asm-tests
make run-bmark-tests
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