Unstable DOUTADOUT when using SDP mode

[traxus4]

Problem: Verilator gives me randomized DOUTADOUT when I'm using SDP mode in RAMB36E2.
Expected behavior: Verilator gives me DOUTADOUT that is consistent with Vivado's behavior.

RAMB36E2's DOUTADOUT and DOUTPADOUTP depends on a register called _r_mem_wr_en_a_wf but it's initialized in a always block of posedge _w_mem_wr_clk_a which is never called when _w_sdp_mode is active due to this line.
So _r_mem_wr_en_a_wf never gets assigned, which is unstable behavior if I'm not using --x-initial 0. It leads to unstable DOUTADOUT.

My current work around is:

// Write first mode
-     assign _w_mem_a_out_p0 = (_r_mem_wr_en_a_wf) ? _r_mem_a_wf_p0 : _r_mem_a_rd_p0;
+     assign _w_mem_a_out_p0 = _r_mem_a_rd_p0;

But it's a bad one I guess. We have to move register initializations into a initial block somewhere

P.S. great lib it helped me a lot