diff --git a/arch/arm/src/sama5/sam_gmac.c b/arch/arm/src/sama5/sam_gmac.c
index 52a8072e678..6d519b7d347 100644
--- a/arch/arm/src/sama5/sam_gmac.c
+++ b/arch/arm/src/sama5/sam_gmac.c
@@ -48,6 +48,7 @@
 
 #include <nuttx/config.h>
 
+#include <inttypes.h>
 #include <stdint.h>
 #include <stdbool.h>
 #include <time.h>
@@ -969,7 +970,7 @@ static int sam_recvframe(struct sam_gmac_s *priv)
   up_invalidate_dcache((uintptr_t)rxdesc,
                        (uintptr_t)rxdesc + sizeof(struct gmac_rxdesc_s));
 
-  ninfo("rxndx: %d\n", rxndx);
+  ninfo("rxndx: %" PRId32 "\n", rxndx);
 
   while ((rxdesc->addr & GMACRXD_ADDR_OWNER) != 0)
     {
@@ -1080,7 +1081,8 @@ static int sam_recvframe(struct sam_gmac_s *priv)
               /* Frame size from the GMAC */
 
               dev->d_len = (rxdesc->status & GMACRXD_STA_FRLEN_MASK);
-              ninfo("packet %d-%d (%d)\n", priv->rxndx, rxndx, dev->d_len);
+              ninfo("packet %d-%" PRId32 " (%d)\n",
+                    priv->rxndx, rxndx, dev->d_len);
 
               /* All data have been copied in the application frame buffer,
                * release the RX descriptor
@@ -1115,7 +1117,7 @@ static int sam_recvframe(struct sam_gmac_s *priv)
 
               if (pktlen < dev->d_len)
                 {
-                  nerr("ERROR: Buffer size %d; frame size %d\n",
+                  nerr("ERROR: Buffer size %d; frame size %" PRId32 "\n",
                        dev->d_len, pktlen);
                   return -E2BIG;
                 }
@@ -1469,7 +1471,7 @@ static void sam_interrupt_work(FAR void *arg)
   imr = sam_getreg(priv, SAM_GMAC_IMR);
 
   pending = isr & ~(imr | GMAC_INT_UNUSED);
-  ninfo("isr: %08x pending: %08x\n", isr, pending);
+  ninfo("isr: %08" PRIx32 " pending: %08" PRIx32 "\n", isr, pending);
 
   /* Check for the completion of a transmission.  This should be done before
    * checking for received data (because receiving can cause another
@@ -1495,7 +1497,7 @@ static void sam_interrupt_work(FAR void *arg)
           clrbits = GMAC_TSR_RLE | sam_txinuse(priv);
           sam_txreset(priv);
 
-          nerr("ERROR: Retry Limit Exceeded TSR: %08x\n", tsr);
+          nerr("ERROR: Retry Limit Exceeded TSR: %08" PRIx32 "\n", tsr);
 
           regval = sam_getreg(priv, SAM_GMAC_NCR);
           regval |= GMAC_NCR_TXEN;
@@ -1506,7 +1508,7 @@ static void sam_interrupt_work(FAR void *arg)
 
       if ((tsr & GMAC_TSR_COL) != 0)
         {
-          nerr("ERROR: Collision occurred TSR: %08x\n", tsr);
+          nerr("ERROR: Collision occurred TSR: %08" PRIx32 "\n", tsr);
           clrbits |= GMAC_TSR_COL;
         }
 
@@ -1514,7 +1516,8 @@ static void sam_interrupt_work(FAR void *arg)
 
       if ((tsr & GMAC_TSR_TFC) != 0)
         {
-          nerr("ERROR: Buffers exhausted mid-frame TSR: %08x\n", tsr);
+          nerr("ERROR: Buffers exhausted mid-frame TSR: %08" PRIx32 "\n",
+               tsr);
           clrbits |= GMAC_TSR_TFC;
         }
 
@@ -1529,7 +1532,7 @@ static void sam_interrupt_work(FAR void *arg)
 
       if ((tsr & GMAC_TSR_UND) != 0)
         {
-          nerr("ERROR: Transmit Underrun TSR: %08x\n", tsr);
+          nerr("ERROR: Transmit Underrun TSR: %08" PRIx32 "\n", tsr);
           clrbits |= GMAC_TSR_UND;
         }
 
@@ -1537,7 +1540,7 @@ static void sam_interrupt_work(FAR void *arg)
 
       if ((tsr & GMAC_TSR_HRESP) != 0)
         {
-          nerr("ERROR: HRESP not OK: %08x\n", tsr);
+          nerr("ERROR: HRESP not OK: %08" PRIx32 "\n", tsr);
           clrbits |= GMAC_TSR_HRESP;
         }
 
@@ -1545,7 +1548,7 @@ static void sam_interrupt_work(FAR void *arg)
 
       if ((tsr & GMAC_TSR_LCO) != 0)
         {
-          nerr("ERROR: Late collision: %08x\n", tsr);
+          nerr("ERROR: Late collision: %08" PRIx32 "\n", tsr);
           clrbits |= GMAC_TSR_LCO;
         }
 
@@ -1582,7 +1585,7 @@ static void sam_interrupt_work(FAR void *arg)
 
       if ((rsr & GMAC_RSR_RXOVR) != 0)
         {
-          nerr("ERROR: Receiver overrun RSR: %08x\n", rsr);
+          nerr("ERROR: Receiver overrun RSR: %08" PRIx32 "\n", rsr);
           clrbits |= GMAC_RSR_RXOVR;
         }
 
@@ -1599,7 +1602,7 @@ static void sam_interrupt_work(FAR void *arg)
 
       if ((rsr & GMAC_RSR_BNA) != 0)
         {
-          nerr("ERROR: Buffer not available RSR: %08x\n", rsr);
+          nerr("ERROR: Buffer not available RSR: %08" PRIx32 "\n", rsr);
           clrbits |= GMAC_RSR_BNA;
         }
 
@@ -1607,7 +1610,7 @@ static void sam_interrupt_work(FAR void *arg)
 
       if ((rsr & GMAC_RSR_HNO) != 0)
         {
-          nerr("ERROR: HRESP not OK: %08x\n", rsr);
+          nerr("ERROR: HRESP not OK: %08" PRIx32 "\n", rsr);
           clrbits |= GMAC_RSR_HNO;
         }
 
@@ -1862,8 +1865,10 @@ static int sam_ifup(struct net_driver_s *dev)
   int ret;
 
   ninfo("Bringing up: %d.%d.%d.%d\n",
-        dev->d_ipaddr & 0xff, (dev->d_ipaddr >> 8) & 0xff,
-        (dev->d_ipaddr >> 16) & 0xff, dev->d_ipaddr >> 24);
+        (int)(dev->d_ipaddr & 0xff),
+        (int)((dev->d_ipaddr >> 8) & 0xff),
+        (int)((dev->d_ipaddr >> 16) & 0xff),
+        (int)(dev->d_ipaddr >> 24));
 
   /* Configure the GMAC interface for normal operation. */