VHDL textio hread problem

Is there any reason you're making an asynchronous rom? and not a synchronous one?

architecture sim of my_rom is
    type rom_t is array(0 to N-1) of std_logic_vector(7 downto 0);
    
    function init_rom return rom_t is
        file rom_file   : text open read_mode is filename;
        variable ret    : rom_t;
        variable l      : line;
    begin
        for i in 0 to N-1 loop
            readline(rom_file, l);
            hread(l, ret(i));
        end loop;
        
        return ret;
    end function init_rom;
     
    constant ROM    : rom_t := init_rom;
begin
    process(rd, addr)
    begin
        if rd='1' then
            rddata <= ROM( to_integer( to_unsigned( address ) );
        end if;
        
    end process;
end architecture sim;