Questasim uvm_dpi.so

[lfernand4]

HI,

I have build the TB and module with questasim 10.6c_3. I start the simulation : make simc (without GUI)

I have the following warning :

Now I run (run -a) :

How can I solve this error ? where does it come from ? I have only add -64 in the scipt.

Thanks in advance.

[raulbehl]

Even I am seeing the same issue. I do see in the Makefile that the C-code is compiled using the vlog command only:

# build TBs
$(library)/.build-tb: $(dpi) $(tbs)
    # Compile top level with DPI headers
    vlog$(questa_version) -sv $(tbs) -work $(library) $(filter %.c %.cc, $(dpi)) -ccflags "-g -std=c++11 " -dpiheader tb/dpi/elfdpi.h
    touch $(library)/.build-tb

Questasim should have been able to load the compiled .so files automatically but for some reason it is not doing that. As a work around to get things working, I did the following:

• Compiled the tb/dpi/*.c files separately:

  g++ -c -fPIC -m64 -std=c++0x -I$QUESTASIM_HOME/include -shared -o elf_dpi.o -c elfdpi.cc
  g++ -shared -m64 -o elf_dpi.so elf_dpi.o

• Updated the simc target of the Makefile

  simc: build
  vsim${questa_version} -64 -c -lib ${library} ${top_level}_optimized +max-cycles=$(max_cycles) +UVM_TESTNAME=${test_case} \
   +BASEDIR=$(riscv-test-dir) $(uvm-flags) +ASMTEST=$(riscv-test) -coverage -classdebug -sv_lib ariane_core/ariane/tb/dpi/elf_dpi -do "do tb/wave/wave_core.do

  (you might have to update the absolute path to ariane/tb/dpi/elf_dpi With the above hack I was able to get it working. The correct fix should enable questasim to included those libraries without doing a separate g++ compile.

[lfernand4]

Thanks for explanations. Now I want to run dhrystone, do you know how to do it ? I have compiled in .elf (.riscv). I feel I need a .hex. It is correct ?

[zarubaf]

Yes, I've added some documentation on that in the README.md. elf2hex 8 2097152 elf_file.riscv 2147483648 > elf_file.riscv.hex`

[zarubaf]

@raulbehl Thanks for clarifying the issue with DPI. I think I will investigate a better approach to that, considering something like you did (not using Questa for it).

[raulbehl]

@zarubaf thank you for the comment. Along with the DPI change, the vsim command in the Makefile also needs the "-64" option passed to it. Otherwise questa complains that the code was compiled with 64-bit support but is not simulated with it.

Also, would it be okay if I add the above mentioned changes to handle DPI calls in the Makefile and open a pull request for the same? You could then add your fixes on top of it assuming those are on the similar lines.

[lfernand4]

I have generate Dhrystone.riscv.elf and Dhrystone.riscv.hex.

command :

vsim -lib work core_tb_optimized "+UVM_TESTNAME=core_test" "+BASEDIR=/prj/xpuips/riscv/riscv-tools/riscv-tests/benchmarks" "+ASMTEST=dhrystone.riscv" "+UVM_NO_RELNOTES" "+UVM_VERBOSITY=HIGH" -coverage -classdebug -sv_lib tb/dpi/elf_dpi -do "do tb/wave/wave_core.do"  

I have this error in questasim :

How can I solve this error ? where does it come from ?

Thanks in advance.

[zarubaf]

@lfernand4 See issue #7 @raulbehl I would be more than happy to accept such a PR. Thanks!