C_TEST not working

In the cl_dram_hbm_dma I am trying to run the cosimulation by itself so I run:
make all C_TEST=test_dram_dma_hwsw_cosim TEST=test_null.
it would error saying the file doesn't exist so I copy it into the source folder.

When I run it again I get the following error:

xsim.dir/tb/xsimk: symbol lookup error: ./xsim.dir/work/xsc/dpi.so: undefined symbol: init_ddr

Command failed: Simulator command interrupted.

I can not firgure out why this is the case. Help will be much appreciated.

Start with the cl_dram_hbm_dma make invocation and the source-folder copy mentioned in the report. Trace how C_TEST=test_dram_dma_hwsw_cosim builds xsim.dir/work/xsc/dpi.so, then inspect whether the library inputs provide init_ddr. Done means the standalone cosimulation runs without the undefined-symbol error.

Written by the indexing model from the issue text.