Install NVmain from Github 2022

The NVmain github reporsitory is outdated, if you try to compile it by yourself you may encounter errors such as: ImportError: No module named gem5_scons:, FlipNWrite.cpp:131:35: error: implicitly-declared ‘constexpr NVM::NVMAddress::NVMAddress(const NVM::NVMAddress&)’ is deprecated [-Werror=deprecated-copy] , etc.

The following steps are tested on Ubuntu 20.04

1. Git clone https://github.com/SEAL-UCSB/NVmain.git
2. install scons : pip install scons
3. if you are using python3 you need conver both SConstruct and SConscript using command 2to3 -w ./SConstruct and 2to3 -w ./SConscript
4. Comment out from gem5_scons import Transform from 36 lines in ./SConscript
5. Add the following CCFLAG in to SConstruct to avoid error: env.Append(CCFLAGS='-Wno-error=deprecated-copy') I am using fast mode so I add it at 35 line. Ref: (https://stackoverflow.com/questions/51863588/warning-definition-of-implicit-copy-constructor-is-deprecated)
6. Run scons --build-type=fast to build NVmain
7. Test ./nvmain.fast Config/PCM_ISSCC_2012_4GB.config