diff --git a/memtester.c b/memtester.c
index 91633e7..8ba314e 100644
--- a/memtester.c
+++ b/memtester.c
@@ -34,7 +34,6 @@
 #define EXIT_FAIL_OTHERTEST     0x04
 
 struct test tests[] = {
-    { "Random Value", test_random_value },
     { "Compare XOR", test_xor_comparison },
     { "Compare SUB", test_sub_comparison },
     { "Compare MUL", test_mul_comparison },
@@ -102,7 +101,29 @@ off_t physaddrbase = 0;
 /* Function definitions */
 void usage(char *me) {
     fprintf(stderr, "\n"
-            "Usage: %s [-p physaddrbase [-d device]] <mem>[B|K|M|G] [loops]\n",
+            "Usage: %s [-p physaddrbase [-d device]] [-m testmask] <mem>[B|K|M|G] [loops]\n"
+            "\n"
+            "[testmask]: specify tests which we want run.\n"
+            "bit0  Compare XOR\n"
+            "bit1  Compare SUB\n"
+            "bit2  Compare MUL\n"
+            "bit3  Compare DIV\n"
+            "bit4  Compare OR\n"
+            "bit5  Compare AND\n"
+            "bit6  Sequential Increment\n"
+            "bit7  Solid Bits\n"
+            "bit8  Block Sequential\n"
+            "bit9  Checkerboard\n"
+            "bit10 Bit Spread\n"
+            "bit11 Bit Flip\n"
+            "bit12 Walking Ones\n"
+            "bit13 Walking Zeroes\n"
+            "bit14 8-bit Writes(ifdef TEST_NARROW_WRITE)\n"
+            "bit15 16-bit Writes(ifdef TEST_NARROW_WRITE)\n"
+            "\n"
+            "eg:\n"
+            "    memtester -m 0xc 10M 1\n"
+            "    means run Compare DIV&MUL tests only to test 10M memory loop 1 time.\n",
             me);
     exit(EXIT_FAIL_NONSTARTER);
 }
@@ -135,7 +156,6 @@ int main(int argc, char **argv) {
     pagesize = memtester_pagesize();
     pagesizemask = (ptrdiff_t) ~(pagesize - 1);
     printf("pagesizemask is 0x%tx\n", pagesizemask);
-    
     /* If MEMTESTER_TEST_MASK is set, we use its value as a mask of which
        tests we run.
      */
@@ -150,7 +170,7 @@ int main(int argc, char **argv) {
         printf("using testmask 0x%lx\n", testmask);
     }
 
-    while ((opt = getopt(argc, argv, "qp:d:")) != -1) {
+    while ((opt = getopt(argc, argv, "qp:d:m:")) != -1) {
         switch (opt) {
             case 'p':
                 errno = 0;
@@ -196,11 +216,21 @@ int main(int argc, char **argv) {
             case 'q':
                 quiet = 1;
                 break;
+            case 'm':
+                errno = 0;
+		testmask = strtoul(optarg, 0, 0);
+                if (errno) {
+                    fprintf(stderr, "error parsing testmask %s: %s\n", 
+                        optarg, strerror(errno));
+                    usage(argv[0]); /* doesn't return */
+                }
+                break;
             default: /* '?' */
                 usage(argv[0]); /* doesn't return */
         }
     }
 
+
     if (device_specified && !use_phys) {
         fprintf(stderr, 
                 "for mem device, physaddrbase (-p) must be specified\n");
@@ -373,6 +403,7 @@ int main(int argc, char **argv) {
             printf("/%lu", loops);
         }
         printf(":\n");
+	printf("<============Prepare============>\n");
         printf("  %-20s: ", "Stuck Address");
         fflush(stdout);
         if (!test_stuck_address(aligned, bufsize / sizeof(ul))) {
@@ -380,6 +411,14 @@ int main(int argc, char **argv) {
         } else {
             exit_code |= EXIT_FAIL_ADDRESSLINES;
         }
+        printf("  %-20s: ", "Random Value");
+        fflush(stdout);
+	if (!test_random_value(bufa, bufb, count)) {
+	    printf("ok\n");
+	    printf("<============Start test============>\n");
+	} else {
+	    exit_code |= EXIT_FAIL_OTHERTEST;
+	}
         for (i=0;;i++) {
             if (!tests[i].name) break;
             /* If using a custom testmask, only run this test if the