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FSM coverage (RTL from CtoS)

I am trying to measuring FSM coverage of RTL code that tis generated with CtoS and co-simulated with its original TLM testbench (CtoS generates some wrappers for doing that).

I am passing -COVFILE covfile.ccf as an argument of ncsc_run. The covfile contains:

select_coverage -all -instance sc_main.channeldownsampleCb.tlm_instance.m_dut_vlog

at the end of the simulation I can visualize toggle and block coverage (iccr) but not FSM coverage.

During simulation I get the warning:

ncsim: *W,COVUSC: Unsupported SystemC module (worklib.sc_main) specified for coverage

What is my error?

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