diff --git a/feed/mii_mgr/src/Makefile b/feed/mii_mgr/src/Makefile
new file mode 100644
index 0000000..55d6a6f
--- /dev/null
+++ b/feed/mii_mgr/src/Makefile
@@ -0,0 +1,16 @@
+EXEC = mii_mgr
+
+CFLAGS += -Wall -Werror
+
+all: $(EXEC)
+
+mii_mgr: mii_mgr.o
+
+	$(CC) $(LDFLAGS) -o $@ $^
+
+romfs:
+	$(ROMFSINST) /bin/mii_mgr
+
+clean:
+	-rm -f $(EXEC) *.elf *.gdb *.o
+
diff --git a/feed/mii_mgr/src/mii_mgr.c b/feed/mii_mgr/src/mii_mgr.c
new file mode 100644
index 0000000..34cf8d5
--- /dev/null
+++ b/feed/mii_mgr/src/mii_mgr.c
@@ -0,0 +1,131 @@
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <linux/ethtool.h>
+#include <linux/mdio.h>
+#include <linux/sockios.h>
+
+void show_usage(void)
+{
+	printf("mii_mgr -g -i [ifname] -p [phy number] -r [register number]\n");
+	printf("  Get: mii_mgr -g -p 3 -r 4\n\n");
+	printf("mii_mgr -s -p [phy number] -r [register number] -v [0xvalue]\n");
+	printf("  Set: mii_mgr -s -p 4 -r 1 -v 0xff11\n");
+	printf("#NOTE: Without -i , eth0 is default ifname!\n");
+	printf("----------------------------------------------------------------------------------------\n");
+	printf("Get: mii_mgr_cl45 -g -p [port number] -d [dev number] -r [register number]\n");
+	printf("Example: mii_mgr_cl45 -g -p 3 -d 0x5 -r 0x4\n\n");
+	printf("Set: mii_mgr_cl45 -s -p [port number] -d [dev number] -r [register number] -v [value]\n");
+	printf("Example: mii_mgr_cl45 -s -p 4 -d 0x6 -r 0x1 -v 0xff11\n\n");
+}
+
+static int __phy_op(char *ifname,uint16_t phy_id,uint16_t reg_num, uint16_t *val, int cmd)
+{
+        static int sd = -1;
+
+        struct ifreq ifr;
+        struct mii_ioctl_data* mii = (struct mii_ioctl_data *)(&ifr.ifr_data);
+        int err;
+
+        if (sd < 0)
+                sd = socket(AF_INET, SOCK_DGRAM, 0);
+
+        if (sd < 0)
+                return sd;
+
+        strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+
+        mii->phy_id  = phy_id;
+        mii->reg_num = reg_num;
+        mii->val_in  = *val;
+        mii->val_out = 0;
+
+        err = ioctl(sd, cmd, &ifr);
+        if (err)
+                return -errno;
+
+        *val = mii->val_out;
+        return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	int opt;
+	char options[] = "gsi:p:d:r:v:?t";
+	int is_write = 0,is_cl45 = 0;
+	unsigned int port=0, dev=0,reg_num=0,val=0;
+	char ifname[IFNAMSIZ]="eth0";	
+	uint16_t phy_id=0;
+
+
+	if (argc < 6) {
+		show_usage();
+		return 0;
+	}
+
+	while ((opt = getopt(argc, argv, options)) != -1) {
+		switch (opt) {
+			case 'g':
+				is_write=0;
+				break;
+			case 's':
+				is_write=1;
+				break;
+			case 'i':
+				strncpy(ifname,optarg, 5);
+				break;	
+			case 'p':
+				port = strtoul(optarg, NULL, 16);
+				break;
+                        case 'd':				
+                                dev = strtoul(optarg, NULL, 16);
+				is_cl45 = 1;
+				break;
+			case 'r':
+				reg_num = strtoul(optarg, NULL, 16);
+				break;
+
+			case 'v':
+				val = strtoul(optarg, NULL, 16);
+				break;
+			case '?':
+				show_usage();
+				break;
+		}
+	}
+
+	if(is_cl45)
+		phy_id = mdio_phy_id_c45(port, dev);
+	else
+		phy_id = port;
+
+	if(is_write) { 
+		__phy_op(ifname,phy_id,reg_num,(uint16_t *)&val,SIOCSMIIREG);
+
+		if(is_cl45)
+			printf("Set: port%x dev%Xh_reg%Xh = 0x%04X\n",port, dev, reg_num, val);
+		else
+			printf("Set: phy[%x].reg[%x] = %04x\n",port, reg_num, val);
+	}	
+	else {
+		__phy_op(ifname,phy_id,reg_num,(uint16_t *)&val,SIOCGMIIREG);
+
+		if(is_cl45)
+			printf("Get: port%x dev%Xh_reg%Xh = 0x%04X\n",port, dev, reg_num, val);
+		else
+			printf("Get: phy[%x].reg[%x] = %04x\n",port, reg_num, val);
+	
+	}
+
+	return 0;	
+}