diff --git a/cpu/native/cc110x_ng/cc1100-sim.c b/cpu/native/cc110x_ng/cc1100-sim.c
index 69ee04798910..aec3ef7ca48c 100644
--- a/cpu/native/cc110x_ng/cc1100-sim.c
+++ b/cpu/native/cc110x_ng/cc1100-sim.c
@@ -57,11 +57,13 @@
 #define MASK_CHIP_RDYn              0x80
 #define MASK_FIFO_BYTES_AVAILABLE   0x0F
 
+#if 0
+static uint8_t internal_state; /* according to table 17 */
 static uint8_t _native_cc1100_spi; /* the pins */
 /* one byte goes in, one byte goes out */
 static uint8_t _native_cc1100_serial_io;
+#endif
 
-static uint8_t internal_state; /* according to table 17 */
 uint8_t addr; /* as sent in header */
 uint8_t _native_cc110x_state;
 
@@ -350,6 +352,9 @@ uint8_t read_single(uint8_t c)
 uint8_t read_burst(uint8_t c)
 {
     DEBUG(" read_burst: ");
+    if (c != 0xFF) {
+        warnx("read_burst: unexpected value");
+    }
 
     if (addr <= 0x2E) {
         DEBUG("read configuration_registers\n");
diff --git a/cpu/native/cc110x_ng/cc110x_ng_cpu.c b/cpu/native/cc110x_ng/cc110x_ng_cpu.c
index 36be7675bc49..f376019b69ba 100644
--- a/cpu/native/cc110x_ng/cc110x_ng_cpu.c
+++ b/cpu/native/cc110x_ng/cc110x_ng_cpu.c
@@ -49,7 +49,7 @@ void _native_handle_cc110xng_input(void)
                 memcpy(rx_fifo, buf+ETHER_HDR_LEN+1, nread);
                 status_registers[CC1100_RXBYTES - 0x30] = nread;
                 rx_fifo_idx = 0;
-                printf("_native_handle_cc110xng_input: got %d bytes payload\n", nread);
+                DEBUG("_native_handle_cc110xng_input: got %d bytes payload\n", nread);
                 cc110x_gdo2_irq();
             }
         }
diff --git a/cpu/native/include/tap.h b/cpu/native/include/tap.h
index ce172b93bd17..6671349e4140 100644
--- a/cpu/native/include/tap.h
+++ b/cpu/native/include/tap.h
@@ -3,7 +3,7 @@
 
 #include <net/ethernet.h>
 
-#define BUFFER_LENGTH 2048
+#define BUFFER_LENGTH 255
 
 /**
  * create and/or open tap device "name"
diff --git a/cpu/native/tap.c b/cpu/native/tap.c
index 0c70e6321a07..daf5fe3fca22 100644
--- a/cpu/native/tap.c
+++ b/cpu/native/tap.c
@@ -20,6 +20,8 @@
 #include <linux/if_ether.h>
 #endif
 
+#include "debug.h"
+
 #include "cpu-conf.h"
 #include "tap.h"
 #include "cc1100sim.h"
@@ -39,9 +41,9 @@ int send_buf(void)
     to_send += 1;
 
     if ((ETHER_HDR_LEN + to_send) < ETHERMIN) {
-        printf("padding data! (%d ->", to_send);
+        DEBUG("padding data! (%d ->", to_send);
         to_send = ETHERMIN - ETHER_HDR_LEN;
-        printf("%d)\n", to_send);
+        DEBUG("%d)\n", to_send);
     }
 
     if ((nsent = write(_native_tap_fd, buf, to_send + ETHER_HDR_LEN)) == -1) {;