diff --git a/drivers/mtd/rammtd.c b/drivers/mtd/rammtd.c
index c4c422cd61..c50db6a3ad 100644
--- a/drivers/mtd/rammtd.c
+++ b/drivers/mtd/rammtd.c
@@ -317,7 +317,7 @@ static int ram_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
     {
       case MTDIOC_GEOMETRY:
         {
-          FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)arg;
+          FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)((uintptr_t)arg);
           if (geo)
             {
               /* Populate the geometry structure with information need to know
@@ -334,7 +334,7 @@ static int ram_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
 
       case MTDIOC_XIPBASE:
         {
-          FAR void **ppv = (FAR void**)arg;
+          FAR void **ppv = (FAR void**)((uintptr_t)arg);
           if (ppv)
             {
               /* Return (void*) base address of device memory */
diff --git a/drivers/mtd/ramtron.c b/drivers/mtd/ramtron.c
index 5739b3b05f..f1149df6dd 100755
--- a/drivers/mtd/ramtron.c
+++ b/drivers/mtd/ramtron.c
@@ -160,7 +160,7 @@ struct ramtron_dev_s
 static struct ramtron_parts_s ramtron_parts[] =
 {
 	{
-		.size = 32*1024,
+		.size = 32L*1024L,
 		.addr_len = 2,
 		.id1 = 0x22,
 		.id2 = 0x00,
@@ -168,7 +168,7 @@ static struct ramtron_parts_s ramtron_parts[] =
 		.name = "FM25V02",
 	},
 	{
-		.size = 32*1024,
+		.size = 32L*1024L,
 		.addr_len = 2,
 		.id1 = 0x22,
 		.id2 = 0x01,
@@ -176,7 +176,7 @@ static struct ramtron_parts_s ramtron_parts[] =
 		.name = "FM25VN02",
 	},
 	{
-		.size = 64*1024,
+		.size = 64L*1024L,
 		.addr_len = 2,
 		.id1 = 0x23,
 		.id2 = 0x00,
@@ -184,7 +184,7 @@ static struct ramtron_parts_s ramtron_parts[] =
 		.name = "FM25V05",
 	},
 	{
-		.size = 64*1024,
+		.size = 64L*1024L,
 		.addr_len = 2,
 		.id1 = 0x23,
 		.id2 = 0x01,
@@ -192,7 +192,7 @@ static struct ramtron_parts_s ramtron_parts[] =
 		.name = "FM25VN05",
 	},
 	{
-		.size = 128*1024,
+		.size = 128L*1024L,
 		.addr_len = 3,
 		.id1 = 0x24,
 		.id2 = 0x00,
@@ -200,7 +200,7 @@ static struct ramtron_parts_s ramtron_parts[] =
 		.name = "FM25V10",
 	},
 	{
-		.size = 128*1024,
+		.size = 128L*1024L,
 		.addr_len = 3,
 		.id1 = 0x24,
 		.id2 = 0x01,
@@ -209,7 +209,7 @@ static struct ramtron_parts_s ramtron_parts[] =
 	},
 #ifdef CONFIG_RAMTRON_FRAM_NON_JEDEC
 	{
-		.size = 256*1024,
+		.size = 256L*1024L,
 		.addr_len = 3,
 		.id1 = 0xff,
 		.id2 = 0xff,