diff --git a/cpu/mc1322x/board/freescale-ncb.h b/cpu/mc1322x/board/freescale-ncb.h
index d1b7b2f8d..5de8c8ef1 100644
--- a/cpu/mc1322x/board/freescale-ncb.h
+++ b/cpu/mc1322x/board/freescale-ncb.h
@@ -36,6 +36,10 @@
 #ifndef BOARD_FREESCALE_NCB_H
 #define BOARD_FREESCALE_NCB_H
 
+#define GPIO_LED_RED   GPIO_23
+#define GPIO_LED_GREEN GPIO_24
+#define GPIO_LED_BLUE  GPIO_25
+
 #define LED_RED    23
 #define LED_GREEN  24
 #define LED_BLUE   25
diff --git a/cpu/mc1322x/board/quahogcon.h b/cpu/mc1322x/board/quahogcon.h
index 6de1ec76d..182e22c06 100644
--- a/cpu/mc1322x/board/quahogcon.h
+++ b/cpu/mc1322x/board/quahogcon.h
@@ -55,6 +55,10 @@
 #define BUTTON2_OUT			(0x1ULL << 22)
 #define BUTTON2_IN			(0x1ULL << 26)
 
+#define GPIO_LED_RED   GPIO_12
+#define GPIO_LED_GREEN GPIO_21
+#define GPIO_LED_BLUE  GPIO_35
+
 #define LED_RED   12
 #define LED_GREEN 21
 #define LED_BLUE  35
diff --git a/cpu/mc1322x/board/redbee-dev.h b/cpu/mc1322x/board/redbee-dev.h
index c54488a14..d961ac081 100644
--- a/cpu/mc1322x/board/redbee-dev.h
+++ b/cpu/mc1322x/board/redbee-dev.h
@@ -36,6 +36,10 @@
 #ifndef BOARD_REDBEE_DEV_H
 #define BOARD_REDBEE_DEV_H
 
+#define GPIO_LED_RED   GPIO_23
+#define GPIO_LED_GREEN GPIO_24
+#define GPIO_LED_BLUE  GPIO_25
+
 #define LED_RED    23
 #define LED_GREEN  24
 #define LED_BLUE   25
diff --git a/cpu/mc1322x/board/redbee-r1.h b/cpu/mc1322x/board/redbee-r1.h
index f63e3ea54..0bc6ef0c9 100644
--- a/cpu/mc1322x/board/redbee-r1.h
+++ b/cpu/mc1322x/board/redbee-r1.h
@@ -36,6 +36,10 @@
 #ifndef BOARD_REDBEE_R1_H
 #define BOARD_REDBEE_R1_H
 
+#define GPIO_LED_RED   GPIO_08
+#define GPIO_LED_GREEN GPIO_09
+#define GPIO_LED_BLUE  GPIO_10
+
 #define LED_RED   8
 #define LED_GREEN 9
 #define LED_BLUE  10
diff --git a/cpu/mc1322x/board/redbee-usb.h b/cpu/mc1322x/board/redbee-usb.h
index 6ddb372b8..88ee4e8cf 100644
--- a/cpu/mc1322x/board/redbee-usb.h
+++ b/cpu/mc1322x/board/redbee-usb.h
@@ -36,6 +36,10 @@
 #ifndef BOARD_REDBEE_USB_H
 #define BOARD_REDBEE_USB_H
 
+#define GPIO_LED_RED   GPIO_23
+#define GPIO_LED_GREEN GPIO_24
+#define GPIO_LED_BLUE  GPIO_25
+
 #define LED_RED   23
 #define LED_GREEN 24
 #define LED_BLUE  25
diff --git a/cpu/mc1322x/lib/maca.c b/cpu/mc1322x/lib/maca.c
index 1a3601d2e..00735bc6a 100644
--- a/cpu/mc1322x/lib/maca.c
+++ b/cpu/mc1322x/lib/maca.c
@@ -650,7 +650,7 @@ void maca_isr(void) {
 		dma_rx->rx_time = *MACA_TIMESTAMP;
 
 		/* check if received packet needs an ack */
-		if(dma_rx->data[1] & 0x20) {
+		if(prm_mode == AUTOACK && (dma_rx->data[1] & 0x20)) {
 			/* this wait is necessary to auto-ack */
 			volatile uint32_t wait_clk;
 			wait_clk = *MACA_CLK + 200;
diff --git a/cpu/mc1322x/src/default_lowlevel.c b/cpu/mc1322x/src/default_lowlevel.c
index 27b35a889..8412663cb 100644
--- a/cpu/mc1322x/src/default_lowlevel.c
+++ b/cpu/mc1322x/src/default_lowlevel.c
@@ -78,11 +78,14 @@ void uart1_init(uint16_t inc, uint16_t mod, uint8_t samp) {
 
 	if(samp == UCON_SAMP_16X) 
 		set_bit(*UART1_UCON,UCON_SAMP);
-	*GPIO_FUNC_SEL0 = ( (0x01 << (14*2)) | (0x01 << (15*2)) ); /* set GPIO15-14 to UART (UART1 TX and RX)*/
+
+        /* set GPIO15-14 to UART (UART1 TX and RX)*/
+	GPIO->FUNC_SEL.GPIO_14 = 1;
+	GPIO->FUNC_SEL.GPIO_15 = 1;
 
 	/* interrupt when there are this number or more bytes free in the TX buffer*/
 	*UART1_UTXCON = 16;
-    u1_tx_head = 0; u1_tx_tail = 0;
+	u1_tx_head = 0; u1_tx_tail = 0;
 
 	/* enable UART1 interrupts in the interrupt controller */
 	enable_irq(UART1);
diff --git a/cpu/mc1322x/tools/mc1322x-load.pl b/cpu/mc1322x/tools/mc1322x-load.pl
index 40a171b9a..bfc1d1ffc 100755
--- a/cpu/mc1322x/tools/mc1322x-load.pl
+++ b/cpu/mc1322x/tools/mc1322x-load.pl
@@ -127,8 +127,8 @@ while(1) {
 	    my $i = 1;
 	    while(read(FILE, $c, 1)) {
 		$i++;
-		usleep($first_delay)  if ( $s == 0 );
-		usleep($second_delay) if ( $s == 1 );
+                usleep($first_delay)  if ( $s == 0 ) && ($first_delay != 0);
+                usleep($second_delay) if ( $s == 1 ) && ($second_delay != 0);
 		$ob->write($c);
 	    }
 	}