Load initialization .mif file to RAM/ROM with impure function

Hi,

For some reason, I have to use a function to load .mif file to initialize RAM/ROM, but cannot use the synthesis attribute.

My function is working well from simulation, it parsed the file very well. But not matter what I do, it just doesn't work on Quartus (I am using Quartus prime pro 19.1, on Stratix 10 devkit). I always got the message:

Info(19337): VHDL info at generic_ram.vhd(231): executing entity "generic_ram(init_file="pu_comp_ram.mif",d_width_a=20,a_width_a=10,ram_type="M20K",ram_model="SMPL_DP_SC")(1,15)(1,4)(1,10)" with architecture "basic_ram_models"

Warning(127007): Memory Initialization File or Hexadecimal (Intel-Format) File "/home/xin/LASP/modules/test/compilation/deep_testing/pu/qdb/_compiler/pu_comp/root_partition/19.2.0/partitioned/1/mifs/ram0_generic_ram_3fe21ac7.hdl.mif" contains "don't care" values -- overwriting them with 0s

Does anybody know if Quartus support VHDL textio? It seems my init_file="pu_comp_ram.mif" has been read and copy to "qdb/_compiler/pu_comp/root_partition/19.2.0/partitioned/1/mifs/ram0_generic_ram_3fe21ac7.hdl.mif" . However the data are all wrong. The content in `ram0_generic_ram_3fe21ac7.hdl.mif` is

```

-- begin_signature

-- generic_ram

-- end_signature

WIDTH=20;

DEPTH=1024;

ADDRESS_RADIX=UNS;

DATA_RADIX=BIN;

CONTENT BEGIN

1023 : UUUUUUUUUUUUUUUUUUUU;

1022 : UUUUUUUUUUUUUUUUUUUU;

1021 : UUUUUUUUUUUUUUUUUUUU;

1020 : UUUUUUUUUUUUUUUUUUUU;

1019 : UUUUUUUUUUUUUUUUUUUU;

1018 : UUUUUUUUUUUUUUUUUUUU;

1017 : UUUUUUUUUUUUUUUUUUUU;

1016 : UUUUUUUUUUUUUUUUUUUU;

1015 : UUUUUUUUUUUUUUUUUUUU;

1014 : UUUUUUUUUUUUUUUUUUUU;

1013 : UUUUUUUUUUUUUUUUUUUU;

1012 : UUUUUUUUUUUUUUUUUUUU;

1011 : UUUUUUUUUUUUUUUUUUUU;

1010 : UUUUUUUUUUUUUUUUUUUU;

1009 : UUUUUUUUUUUUUUUUUUUU;

1008 : UUUUUUUUUUUUUUUUUUUU;

1007 : UUUUUUUUUUUUUUUUUUUU;

1006 : UUUUUUUUUUUUUUUUUUUU;

.

.

.

```

Thanks, Xin