diff --git a/apps/Makefile b/apps/Makefile
index b229b86..bb3ef07 100644
--- a/apps/Makefile
+++ b/apps/Makefile
@@ -1,4 +1,4 @@
-all: cit citin flashprog modt ddtest setmod ddflash setmod2
+all: cit citin flashprog modt ddtest setmod ddflash setmod2 pls
 
 cit: cit.c
 	$(CC) -o cit cit.c -lpthread
@@ -20,3 +20,6 @@ ddtest: ddtest.c
 
 ddflash: ddflash.c
 	$(CC) -o ddflash ddflash.c
+
+pls: pls.c
+	$(CC) -o pls pls.c
diff --git a/apps/pls.c b/apps/pls.c
new file mode 100644
index 0000000..4573d2a
--- /dev/null
+++ b/apps/pls.c
@@ -0,0 +1,95 @@
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdint.h>
+
+static uint32_t gold2root(uint32_t gold)
+{
+	uint32_t x, g;
+	
+	for (g = 0, x = 1; g < gold; g++)
+		x = (((x ^ (x >> 7)) & 1) << 17) | (x >> 1);
+	return x;
+}
+
+static uint32_t root2gold(uint32_t root)
+{
+	uint32_t x, g;
+	
+	for (g = 0, x = 1; g < 0x3ffff; g++)  {
+		if (root == x)
+			return g;
+		x = (((x ^ (x >> 7)) & 1) << 17) | (x >> 1);
+	}
+	return 0xffffffff;
+}
+
+int main(int argc, char **argv)
+{
+	uint32_t gold = 0xffffffff, root = 0xffffffff;
+	
+	while (1) {
+                int option_index = 0;
+		int c;
+                static struct option long_options[] = {
+			{"gold", required_argument, 0, 'g'},
+			{"root", required_argument, 0, 'r'},
+			{"help", no_argument , 0, 'h'},
+			{0, 0, 0, 0}
+		};
+                c = getopt_long(argc, argv, 
+				"r:g:h",
+				long_options, &option_index);
+		if (c==-1)
+ 			break;
+		
+		switch (c) {
+		case 'g':
+			gold = strtoul(optarg, NULL, 0);
+			break;
+		case 'r':
+			root = strtoul(optarg, NULL, 0);
+			break;
+		case 'h':
+			printf("cit -a<adapter> -d<device>\n");
+			exit(-1);
+		default:
+			break;
+			
+		}
+	}
+	if (optind < argc) {
+		printf("Warning: unused arguments\n");
+	}
+	if (gold != 0xffffffff && root != 0xffffffff) {
+		printf("Only specify root or gold code\n");
+		exit(-1);
+	};
+	if (gold != 0xffffffff) {
+		if (gold < 0x3ffff) {
+			root = gold2root(gold);
+			printf("gold = %llu (0x%05x)   root = %llu (0x%05x)\n",
+			       gold, gold, root, root);
+		} else
+			printf("Invalid gold code specified.\n");
+		exit(0);
+	} 
+	if (root != 0xffffffff) {
+		if (root > 0 && root < 0x40000)
+			gold = root2gold(root);
+		if (gold != 0xffffffff)
+			printf("gold = %llu (0x%05x)   root = %llu (0x%05x)\n",
+			       gold, gold, root, root);
+		else
+			printf("Invalid root code specified.\n");
+		exit(0);
+	}
+	printf("Specify either root or gold code with -r or -g.\n");
+}