Fix warning differ in signedness in net/net.c and net/nfs.c
diff --git a/net/bootp.c b/net/bootp.c
index 55dcc81..89e30d2 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -33,7 +33,7 @@
 
 #if defined(CONFIG_CMD_NET)
 
-#define TIMEOUT		5		/* Seconds before trying BOOTP again	*/
+#define TIMEOUT		5UL		/* Seconds before trying BOOTP again	*/
 #ifndef CONFIG_NET_RETRY_COUNT
 # define TIMEOUT_COUNT	5		/* # of timeouts before giving up  */
 #else
diff --git a/net/bootp.h b/net/bootp.h
index ba9826e..320cc3b 100644
--- a/net/bootp.h
+++ b/net/bootp.h
@@ -88,7 +88,7 @@
 #define DHCP_NAK      6
 #define DHCP_RELEASE  7
 
-#define SELECT_TIMEOUT 3	/* Seconds to wait for offers */
+#define SELECT_TIMEOUT 3UL	/* Seconds to wait for offers */
 
 /**********************************************************************/
 
diff --git a/net/net.c b/net/net.c
index cde2680..c719bc4 100644
--- a/net/net.c
+++ b/net/net.c
@@ -94,7 +94,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#define ARP_TIMEOUT		5		/* Seconds before trying ARP again */
+#define ARP_TIMEOUT		5UL		/* Seconds before trying ARP again */
 #ifndef	CONFIG_NET_RETRY_COUNT
 # define ARP_TIMEOUT_COUNT	5		/* # of timeouts before giving up  */
 #else
@@ -589,7 +589,7 @@
 		return;
 	}
 #ifndef CONFIG_NET_MULTI
-	NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
+	NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 	NetSetHandler (startAgainHandler);
 #else	/* !CONFIG_NET_MULTI*/
 	eth_halt ();
@@ -598,7 +598,7 @@
 	if (NetRestartWrap) {
 		NetRestartWrap = 0;
 		if (NetDevExists && !once) {
-			NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
+			NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 			NetSetHandler (startAgainHandler);
 		} else {
 			NetState = NETLOOP_FAIL;
@@ -774,7 +774,7 @@
 #if defined(CONFIG_NET_MULTI)
 	printf ("Using %s device\n", eth_get_name());
 #endif	/* CONFIG_NET_MULTI */
-	NetSetTimeout (10 * CFG_HZ, PingTimeout);
+	NetSetTimeout (10UL * CFG_HZ, PingTimeout);
 	NetSetHandler (PingHandler);
 
 	PingSend();
diff --git a/net/nfs.c b/net/nfs.c
index 1b27c97..aa8d612 100644
--- a/net/nfs.c
+++ b/net/nfs.c
@@ -34,7 +34,7 @@
 #if defined(CONFIG_CMD_NET) && defined(CONFIG_CMD_NFS)
 
 #define HASHES_PER_LINE 65	/* Number of "loading" hashes per line	*/
-#define NFS_TIMEOUT 60
+#define NFS_TIMEOUT 60UL
 
 static int fs_mounted = 0;
 static unsigned long rpc_id = 0;
diff --git a/net/rarp.c b/net/rarp.c
index 21dfa52..ecf38e4 100644
--- a/net/rarp.c
+++ b/net/rarp.c
@@ -31,7 +31,7 @@
 
 #if defined(CONFIG_CMD_NET)
 
-#define TIMEOUT		5		/* Seconds before trying BOOTP again */
+#define TIMEOUT		5UL		/* Seconds before trying BOOTP again */
 #ifndef	CONFIG_NET_RETRY_COUNT
 # define TIMEOUT_COUNT	5		/* # of timeouts before giving up  */
 #else
diff --git a/net/tftp.c b/net/tftp.c
index 5ee7676..8b95bcf 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -15,7 +15,7 @@
 #if defined(CONFIG_CMD_NET)
 
 #define WELL_KNOWN_PORT	69		/* Well known TFTP port #		*/
-#define TIMEOUT		5		/* Seconds to timeout for a lost pkt	*/
+#define TIMEOUT		5UL		/* Seconds to timeout for a lost pkt	*/
 #ifndef	CONFIG_NET_RETRY_COUNT
 # define TIMEOUT_COUNT	10		/* # of timeouts before giving up  */
 #else