diff --git a/firmware/target/arm/s5l8702/debug-s5l8702.c b/firmware/target/arm/s5l8702/debug-s5l8702.c
index 48a20a97c2..b274b5fc0a 100644
--- a/firmware/target/arm/s5l8702/debug-s5l8702.c
+++ b/firmware/target/arm/s5l8702/debug-s5l8702.c
@@ -138,22 +138,26 @@ bool dbg_hw_info(void)
         else if(state==2)
         {
             extern struct uartc_port ser_port;
-            int tx_stat, rx_stat, tx_speed, rx_speed;
-            char line_cfg[4];
-            int abr_stat;
-            uint32_t abr_cnt;
-            char *abrstatus[] = {"Idle", "Launched", "Counting", "Abnormal"};
+            bool opened = !!ser_port.uartc->port_l[ser_port.id];
+            _DEBUG_PRINTF("UART %d: %s", ser_port.id, opened ? "opened":"closed");
+            if (opened)
+            {
+                int tx_stat, rx_stat, tx_speed, rx_speed;
+                char line_cfg[4];
+                int abr_stat;
+                uint32_t abr_cnt;
+                char *abrstatus[] = {"Idle", "Launched", "Counting", "Abnormal"};
 
-            uartc_port_get_line_info(&ser_port,
-                        &tx_stat, &rx_stat, &tx_speed, &rx_speed, line_cfg);
-            abr_stat = uartc_port_get_abr_info(&ser_port, &abr_cnt);
+                uartc_port_get_line_info(&ser_port,
+                            &tx_stat, &rx_stat, &tx_speed, &rx_speed, line_cfg);
+                abr_stat = uartc_port_get_abr_info(&ser_port, &abr_cnt);
 
-            _DEBUG_PRINTF("UART %d:", ser_port.id);
-            line++;
-            _DEBUG_PRINTF("line: %s", line_cfg);
-            _DEBUG_PRINTF("Tx: %s, speed: %d", tx_stat ? "On":"Off", tx_speed);
-            _DEBUG_PRINTF("Rx: %s, speed: %d", rx_stat ? "On":"Off", rx_speed);
-            _DEBUG_PRINTF("ABR: %s, cnt: %u", abrstatus[abr_stat], abr_cnt);
+                line++;
+                _DEBUG_PRINTF("line: %s", line_cfg);
+                _DEBUG_PRINTF("Tx: %s, speed: %d", tx_stat ? "On":"Off", tx_speed);
+                _DEBUG_PRINTF("Rx: %s, speed: %d", rx_stat ? "On":"Off", rx_speed);
+                _DEBUG_PRINTF("ABR: %s, cnt: %u", abrstatus[abr_stat], abr_cnt);
+            }
             line++;
             _DEBUG_PRINTF("n_tx_bytes: %u", ser_port.n_tx_bytes);
             _DEBUG_PRINTF("n_rx_bytes: %u", ser_port.n_rx_bytes);
@@ -162,7 +166,7 @@ bool dbg_hw_info(void)
             _DEBUG_PRINTF("n_frame_err: %u", ser_port.n_frame_err);
             _DEBUG_PRINTF("n_break_detect: %u", ser_port.n_break_detect);
             _DEBUG_PRINTF("ABR n_abnormal: %u %u",
-                        ser_port.n_abnormal0, ser_port.n_abnormal1);
+                            ser_port.n_abnormal0, ser_port.n_abnormal1);
         }
 #endif
         else
diff --git a/firmware/target/arm/s5l8702/ipod6g/serial-ipod6g.c b/firmware/target/arm/s5l8702/ipod6g/serial-ipod6g.c
index c77b5d0c95..f1f06987bc 100644
--- a/firmware/target/arm/s5l8702/ipod6g/serial-ipod6g.c
+++ b/firmware/target/arm/s5l8702/ipod6g/serial-ipod6g.c
@@ -48,7 +48,7 @@
 
 extern const struct uartc s5l8702_uartc;
 #ifdef IPOD_ACCESSORY_PROTOCOL
-void iap_rx_isr(int, char*, char*, uint32_t);
+static void iap_rx_isr(int, char*, char*, uint32_t);
 #endif
 
 struct uartc_port ser_port IDATA_ATTR =
@@ -75,6 +75,17 @@ struct uartc_port ser_port IDATA_ATTR =
 /*
  * serial driver API
  */
+int tx_rdy(void)
+{
+    return uartc_port_tx_ready(&ser_port) ? 1 : 0;
+}
+
+void tx_writec(unsigned char c)
+{
+    uartc_port_tx_byte(&ser_port, c);
+}
+
+#ifndef IPOD_ACCESSORY_PROTOCOL
 void serial_setup(void)
 {
     uartc_port_open(&ser_port);
@@ -91,18 +102,10 @@ void serial_setup(void)
     logf("[%lu] "MODEL_NAME" port %d ready!", USEC_TIMER, ser_port.id);
 }
 
-int tx_rdy(void)
-{
-    return uartc_port_tx_ready(&ser_port) ? 1 : 0;
-}
 
-void tx_writec(unsigned char c)
-{
-    uartc_port_tx_byte(&ser_port, c);
-}
-
-
-#ifdef IPOD_ACCESSORY_PROTOCOL
+#else /* IPOD_ACCESSORY_PROTOCOL */
+#include "kernel.h"
+#include "pmu-target.h"
 #include "iap.h"
 
 static enum {
@@ -111,8 +114,46 @@ static enum {
     ABR_STATUS_DONE
 } abr_status;
 
+static int bitrate = 0;
+static bool acc_plugged = false;
+
+static void serial_acc_tick(void)
+{
+    bool plugged = pmu_accessory_present();
+    if (acc_plugged != plugged)
+    {
+        acc_plugged = plugged;
+        if (acc_plugged)
+        {
+            uartc_open(ser_port.uartc);
+            uartc_port_open(&ser_port);
+            /* set a default configuration, Tx and Rx modes are
+               disabled when the port is initialized */
+            uartc_port_config(&ser_port, ULCON_DATA_BITS_8,
+                                ULCON_PARITY_NONE, ULCON_STOP_BITS_1);
+            uartc_port_set_tx_mode(&ser_port, UCON_MODE_INTREQ);
+            serial_bitrate(bitrate);
+        }
+        else
+        {
+            uartc_port_close(&ser_port);
+            uartc_close(ser_port.uartc);
+        }
+    }
+}
+
+void serial_setup(void)
+{
+    uartc_close(ser_port.uartc);
+    tick_add_task(serial_acc_tick);
+}
+
 void serial_bitrate(int rate)
 {
+    bitrate = rate;
+    if (!acc_plugged)
+        return;
+
     logf("[%lu] serial_bitrate(%d)", USEC_TIMER, rate);
 
     if (rate == 0) {
@@ -150,7 +191,7 @@ void serial_bitrate(int rate)
     }
 }
 
-void iap_rx_isr(int len, char *data, char *err, uint32_t abr_cnt)
+static void iap_rx_isr(int len, char *data, char *err, uint32_t abr_cnt)
 {
     /* ignore Rx errors, upper layer will discard bad packets */
     (void) err;