# vcs: Error-[ICPD_INIT] Illegal combination of drivers

Error-[ICPD_INIT] Illegal combination of drivers
../../common/caravel_project/rtl/verilog/mgmt_core.patrick.v, 103
  Illegal combination of procedural drivers
  Variable "mgmtsoc_interrupt" is driven by an invalid combination of
  procedural drivers. Variables written on left-hand of "always_comb" cannot
  be written to by any other processes, including other "always_comb"
  processes.
  This variable is declared at
  "../../common/caravel_project/rtl/verilog/mgmt_core.patrick.v", 103: reg
  [31:0] mgmtsoc_interrupt;
  The first driver is at
  "../../common/caravel_project/rtl/verilog/mgmt_core.patrick.v", 1830:
  always_comb  begin
  mgmtsoc_interrupt = 32'b0;
   ...
  The second driver is at
  "../../common/caravel_project/rtl/verilog/mgmt_core.patrick.v", 103:
  mgmtsoc_interrupt = 32'b0;
  Use '-ignore initializer_driver_checks' to suppress this error

## refernce code - Illegal combination of drivers

reg [31:0] mgmtsoc_interrupt = 32'd0;

always_comb begin
	mgmtsoc_interrupt = 32'd0;
	mgmtsoc_interrupt[0] = mgmtsoc_irq;
	mgmtsoc_interrupt[1] = uart_irq;
	mgmtsoc_interrupt[2] = gpioin0_gpioin0_irq;
	mgmtsoc_interrupt[3] = gpioin1_gpioin1_irq;
	mgmtsoc_interrupt[4] = gpioin2_gpioin2_irq;
	mgmtsoc_interrupt[5] = gpioin3_gpioin3_irq;
	mgmtsoc_interrupt[6] = gpioin4_gpioin4_irq;
	mgmtsoc_interrupt[7] = gpioin5_gpioin5_irq;
end

[code link](https://github.com/bol-edu/fsic_asic/blob/main/dsn/rtl/mgmt_core.patrick.v#L102)

## solution - use python code to remove Illegal combination of drivers

https://github.com/TonyHo722/python_study/blob/main/verilog_re_match/remove_multiple_drive.py