Accessing Environment Variable in rom1p1r.sv

Created by: europe2024

Below is the platform.

 Verilator 5.025 devel rev v5.024-5-g1012c054e
 variant of Debian (version 12) on ARM

The following line

  $readmemh("$WALLY/fpga/src/boot.mem", ROM, 0);

in

 $WALLY/src/generic/mem/rom1p1r.sv

uses environment-variable $WALLY, but Verilator does not automatically generate code to get its value.

Below is one way to access $WALLY.

 rom1p1r.sv
 ----------
 import "DPI-C" function string getenvval(input string env_name);

 $readmemh({getenvval("WALLY"), "/fpga/src/boot.mem"}, ROM, 0);


 clangwrapper.c
 --------------
 #include <stdio.h>
 #include <stdlib.h>

 #include "Vtestbench__Dpi.h"

 const char *getenvval(const char *pszName) {
   return ((const char *) getenv(pszName));
 }