diff --git a/inc/mem_seg.h b/inc/mem_seg.h
index 27112e3..ffc8b47 100644
--- a/inc/mem_seg.h
+++ b/inc/mem_seg.h
@@ -1,6 +1,9 @@
 #ifndef __MEM_SEG_H__
 #define __MEM_SEG_H__
 
+#ifndef DEVICE_TYPE
+#define DEVICE_TYPE EXTENDED_DEVICE_TYPE_DUMMY
+#endif
 
 // #define MEMSEG_PC_SEG_NUM 0
 // #define MEMSEG_PC_ADDR 0
diff --git a/manifest_src/gen_manifest_json.py b/manifest_src/gen_manifest_json.py
index 1eda334..a1baf99 100644
--- a/manifest_src/gen_manifest_json.py
+++ b/manifest_src/gen_manifest_json.py
@@ -8,9 +8,14 @@ def main():
         return
     manifest_dir = sys.argv[1]
     
+    with open(manifest_dir + '/dev_type', 'r') as f:
+        dev_type = f.read()
+    
+    
     mem_segments = []
     out_manifest = {
-        'mem_segments': mem_segments
+        'mem_segments': mem_segments,
+        'dev_type': dev_type
     }
     
     with open(manifest_dir + '/seg_data.csv', 'r', newline='') as csvfile:
diff --git a/manifest_src/generate_dev_type.c b/manifest_src/generate_dev_type.c
new file mode 100644
index 0000000..1eeca5d
--- /dev/null
+++ b/manifest_src/generate_dev_type.c
@@ -0,0 +1,65 @@
+#include "mem.h"
+#include "mem_seg.h"
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+int main(int argc, char** argv)
+{
+    if(argc != 2)
+    {
+        printf("provide target directory\n");
+        return 1;
+    }
+
+    const char *dirpath = argv[1];
+    const char *filename = "dev_type";
+
+    char *tgtpath = (char*)calloc(strlen(dirpath) + strlen(filename) + 1, sizeof(char));
+    if(tgtpath == NULL)
+    {
+        return 1;
+    }
+
+    sprintf(tgtpath, "%s/%s", dirpath, filename);
+
+    FILE *fptr;
+
+    fptr = fopen(tgtpath, "w");
+
+    if(fptr == NULL)
+    {
+        printf("errof opening file\n");
+        return 1;
+    }
+
+    int dev_type = DEVICE_TYPE;
+    int exitcode = 0;
+
+    switch (dev_type) 
+    {
+        case EXTENDED_DEVICE_TYPE_DUMMY:
+        {
+            fprintf(fptr, "dummy");
+            break;
+        }
+        case EXTENDED_DEVICE_TYPE_INSTR_SIMUL:
+        {
+            fprintf(fptr, "instr_simul");
+            break;
+        }
+        default:
+        {
+            printf("invalid device type: %d\n", dev_type);
+            exitcode = 1;
+        }
+    
+    }
+
+    
+    fclose(fptr);
+    free(tgtpath);
+    return exitcode;
+}
\ No newline at end of file
diff --git a/src/device.c b/src/device.c
index c73b29a..2e77893 100644
--- a/src/device.c
+++ b/src/device.c
@@ -646,6 +646,6 @@ device_public_context_t* init(device_specs_t* specs, char* errbuf)
 
 uint8_t pubDeviceType() 
 {
-    return EXTENDED_DEVICE_TYPE_DUMMY;
+    return DEVICE_TYPE;
 }