init commit via android 4.4 uboot

1 files changed, 1768 insertions, 0 deletions

diff --git a/net/net.c b/net/net.c
new file mode 100755
index 0000000..5779429
--- /dev/null
+++ b/net/net.c
@@ -0,0 +1,1768 @@
+/*++ 
+Copyright (c) 2010 WonderMedia Technologies, Inc.
+
+This program is free software: you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software 
+Foundation, either version 2 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE.  See the GNU General Public License for more details. You
+should have received a copy of the GNU General Public License along with this
+program. If not, see http://www.gnu.org/licenses/>.
+
+WonderMedia Technologies, Inc.
+10F, 529, Chung-Cheng Road, Hsin-Tien, Taipei 231, R.O.C.
+--*/
+/*
+ *	Copied from Linux Monitor (LiMon) - Networking.
+ *
+ *	Copyright 1994 - 2000 Neil Russell.
+ *	(See License)
+ *	Copyright 2000 Roland Borde
+ *	Copyright 2000 Paolo Scaffardi
+ *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de
+ */
+
+/*
+ * General Desription:
+ *
+ * The user interface supports commands for BOOTP, RARP, and TFTP.
+ * Also, we support ARP internally. Depending on available data,
+ * these interact as follows:
+ *
+ * BOOTP:
+ *
+ *	Prerequisites:	- own ethernet address
+ *	We want:	- own IP address
+ *			- TFTP server IP address
+ *			- name of bootfile
+ *	Next step:	ARP
+ *
+ * RARP:
+ *
+ *	Prerequisites:	- own ethernet address
+ *	We want:	- own IP address
+ *			- TFTP server IP address
+ *	Next step:	ARP
+ *
+ * ARP:
+ *
+ *	Prerequisites:	- own ethernet address
+ *			- own IP address
+ *			- TFTP server IP address
+ *	We want:	- TFTP server ethernet address
+ *	Next step:	TFTP
+ *
+ * DHCP:
+ *
+ *     Prerequisites:	- own ethernet address
+ *     We want:		- IP, Netmask, ServerIP, Gateway IP
+ *			- bootfilename, lease time
+ *     Next step:	- TFTP
+ *
+ * TFTP:
+ *
+ *	Prerequisites:	- own ethernet address
+ *			- own IP address
+ *			- TFTP server IP address
+ *			- TFTP server ethernet address
+ *			- name of bootfile (if unknown, we use a default name
+ *			  derived from our own IP address)
+ *	We want:	- load the boot file
+ *	Next step:	none
+ *
+ * NFS:
+ *
+ *	Prerequisites:	- own ethernet address
+ *			- own IP address
+ *			- name of bootfile (if unknown, we use a default name
+ *			  derived from our own IP address)
+ *	We want:	- load the boot file
+ *	Next step:	none
+ *
+ * SNTP:
+ *
+ *	Prerequisites:	- own ethernet address
+ *			- own IP address
+ *	We want:	- network time
+ *	Next step:	none
+ */
+
+
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <net.h>
+#include "bootp.h"
+#include "tftp.h"
+#include "rarp.h"
+#include "nfs.h"
+#ifdef CONFIG_STATUS_LED
+#include <status_led.h>
+#include <miiphy.h>
+#endif
+#if (CONFIG_COMMANDS & CFG_CMD_SNTP)
+#include "sntp.h"
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define ARP_TIMEOUT		5		/* Seconds before trying ARP again */
+#ifndef	CONFIG_NET_RETRY_COUNT
+# define ARP_TIMEOUT_COUNT	5		/* # of timeouts before giving up  */
+#else
+# define ARP_TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
+#endif
+
+#if 0
+#define ET_DEBUG
+#endif
+
+/** BOOTP EXTENTIONS **/
+
+IPaddr_t	NetOurSubnetMask=0;		/* Our subnet mask (0=unknown)	*/
+IPaddr_t	NetOurGatewayIP=0;		/* Our gateways IP address	*/
+IPaddr_t	NetOurDNSIP=0;			/* Our DNS IP address		*/
+#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2)
+IPaddr_t	NetOurDNS2IP=0;			/* Our 2nd DNS IP address	*/
+#endif
+char		NetOurNISDomain[32]={0,};	/* Our NIS domain		*/
+char		NetOurHostName[32]={0,};	/* Our hostname			*/
+char		NetOurRootPath[64]={0,};	/* Our bootpath			*/
+ushort		NetBootFileSize=0;		/* Our bootfile size in blocks	*/
+
+/** END OF BOOTP EXTENTIONS **/
+
+ulong		NetBootFileXferSize;	/* The actual transferred size of the bootfile (in bytes) */
+uchar		NetOurEther[6];		/* Our ethernet address			*/
+uchar		NetServerEther[6] =	/* Boot server enet address		*/
+			{ 0, 0, 0, 0, 0, 0 };
+IPaddr_t	NetOurIP;		/* Our IP addr (0 = unknown)		*/
+IPaddr_t	NetServerIP;		/* Our IP addr (0 = unknown)		*/
+volatile uchar *NetRxPkt;		/* Current receive packet		*/
+int		NetRxPktLen;		/* Current rx packet length		*/
+unsigned	NetIPID;		/* IP packet ID				*/
+uchar		NetBcastAddr[6] =	/* Ethernet bcast address		*/
+			{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+uchar		NetEtherNullAddr[6] =
+			{ 0, 0, 0, 0, 0, 0 };
+#if (CONFIG_COMMANDS & CFG_CMD_CDP)
+uchar		NetCDPAddr[6] =		/* Ethernet bcast address		*/
+			{ 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
+#endif
+int		NetState;		/* Network loop state			*/
+#ifdef CONFIG_NET_MULTI
+int		NetRestartWrap = 0;	/* Tried all network devices		*/
+static int	NetRestarted = 0;	/* Network loop restarted		*/
+static int	NetDevExists = 0;	/* At least one device configured	*/
+#endif
+
+/* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
+ushort		NetOurVLAN = 0xFFFF;		/* default is without VLAN	*/
+ushort		NetOurNativeVLAN = 0xFFFF;	/* ditto			*/
+
+char		BootFile[128];		/* Boot File name			*/
+
+#if (CONFIG_COMMANDS & CFG_CMD_PING)
+IPaddr_t	NetPingIP;		/* the ip address to ping 		*/
+
+static void PingStart(void);
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_CDP)
+static void CDPStart(void);
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_SNTP)
+IPaddr_t	NetNtpServerIP;		/* NTP server IP address		*/
+int		NetTimeOffset=0;	/* offset time from UTC			*/
+#endif
+
+#ifdef CONFIG_NETCONSOLE
+void NcStart(void);
+int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
+#endif
+
+volatile uchar	PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
+
+volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets			*/
+
+static rxhand_f *packetHandler;		/* Current RX packet handler		*/
+static thand_f *timeHandler;		/* Current timeout handler		*/
+static ulong	timeStart;		/* Time base value			*/
+static ulong	timeDelta;		/* Current timeout value		*/
+volatile uchar *NetTxPacket = 0;	/* THE transmit packet			*/
+
+static int net_check_prereq (proto_t protocol);
+
+/**********************************************************************/
+
+IPaddr_t	NetArpWaitPacketIP;
+IPaddr_t	NetArpWaitReplyIP;
+uchar	       *NetArpWaitPacketMAC;	/* MAC address of waiting packet's destination	*/
+uchar	       *NetArpWaitTxPacket;	/* THE transmit packet			*/
+int		NetArpWaitTxPacketSize;
+uchar 		NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
+ulong		NetArpWaitTimerStart;
+int		NetArpWaitTry;
+
+void ArpRequest (void)
+{
+	int i;
+	volatile uchar *pkt;
+	ARP_t *arp;
+
+#ifdef ET_DEBUG
+	printf ("ARP broadcast %d\n", NetArpWaitTry);
+#endif
+	pkt = NetTxPacket;
+
+	pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
+
+	arp = (ARP_t *) pkt;
+
+	arp->ar_hrd = htons (ARP_ETHER);
+	arp->ar_pro = htons (PROT_IP);
+	arp->ar_hln = 6;
+	arp->ar_pln = 4;
+	arp->ar_op = htons (ARPOP_REQUEST);
+
+	memcpy (&arp->ar_data[0], NetOurEther, 6);		/* source ET addr	*/
+	NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);	/* source IP addr	*/
+	for (i = 10; i < 16; ++i) {
+		arp->ar_data[i] = 0;				/* dest ET addr = 0     */
+	}
+
+	if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
+	    (NetOurIP & NetOurSubnetMask)) {
+		if (NetOurGatewayIP == 0) {
+			puts ("## Warning: gatewayip needed but not set\n");
+		}
+		NetArpWaitReplyIP = NetOurGatewayIP;
+	} else {
+		NetArpWaitReplyIP = NetArpWaitPacketIP;
+	}
+
+	NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
+	(void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
+}
+
+void ArpTimeoutCheck(void)
+{
+	ulong t;
+
+	if (!NetArpWaitPacketIP)
+		return;
+
+	t = get_timer(0);
+
+	/* check for arp timeout */
+	if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
+		NetArpWaitTry++;
+
+		if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
+			puts ("\nARP Retry count exceeded; starting again\n");
+			NetArpWaitTry = 0;
+			NetStartAgain();
+		} else {
+			NetArpWaitTimerStart = t;
+			ArpRequest();
+		}
+	}
+}
+
+/**********************************************************************/
+/*
+ *	Main network processing loop.
+ */
+
+int
+NetLoop(proto_t protocol)
+{
+	bd_t *bd = gd->bd;
+
+#ifdef CONFIG_NET_MULTI
+	NetRestarted = 0;
+	NetDevExists = 0;
+#endif
+
+	/* XXX problem with bss workaround */
+	NetArpWaitPacketMAC = NULL;
+	NetArpWaitTxPacket = NULL;
+	NetArpWaitPacketIP = 0;
+	NetArpWaitReplyIP = 0;
+	NetArpWaitTxPacket = NULL;
+	NetTxPacket = NULL;
+
+	if (!NetTxPacket) {
+		int	i;
+		/*
+		 *	Setup packet buffers, aligned correctly.
+		 */
+		NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
+		NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
+		for (i = 0; i < PKTBUFSRX; i++) {
+			NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
+		}
+	}
+
+	if (!NetArpWaitTxPacket) {
+		NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
+		NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
+		NetArpWaitTxPacketSize = 0;
+	}
+
+	eth_halt();
+#ifdef CONFIG_NET_MULTI
+	eth_set_current();
+#endif
+	if (eth_init(bd) < 0) {
+		eth_halt();
+		return(-1);
+	}
+
+restart:
+#ifdef CONFIG_NET_MULTI
+	memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
+#else
+	memcpy (NetOurEther, bd->bi_enetaddr, 6);
+#endif
+
+	NetState = NETLOOP_CONTINUE;
+
+	/*
+	 *	Start the ball rolling with the given start function.  From
+	 *	here on, this code is a state machine driven by received
+	 *	packets and timer events.
+	 */
+
+	switch (protocol) {
+#if (CONFIG_COMMANDS & CFG_CMD_NFS)
+	case NFS:
+#endif
+#if (CONFIG_COMMANDS & CFG_CMD_PING)
+	case PING:
+#endif
+#if (CONFIG_COMMANDS & CFG_CMD_SNTP)
+	case SNTP:
+#endif
+	case NETCONS:
+	case TFTP:
+		NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
+		NetOurGatewayIP = getenv_IPaddr ("gatewayip");
+		NetOurSubnetMask= getenv_IPaddr ("netmask");
+		NetOurVLAN = getenv_VLAN("vlan");
+		NetOurNativeVLAN = getenv_VLAN("nvlan");
+
+		switch (protocol) {
+#if (CONFIG_COMMANDS & CFG_CMD_NFS)
+		case NFS:
+#endif
+		case NETCONS:
+		case TFTP:
+			NetServerIP = getenv_IPaddr ("serverip");
+			break;
+#if (CONFIG_COMMANDS & CFG_CMD_PING)
+		case PING:
+			/* nothing */
+			break;
+#endif
+#if (CONFIG_COMMANDS & CFG_CMD_SNTP)
+		case SNTP:
+			/* nothing */
+			break;
+#endif
+		default:
+			break;
+		}
+
+		break;
+	case BOOTP:
+	case RARP:
+		/*
+		 * initialize our IP addr to 0 in order to accept ANY
+		 * IP addr assigned to us by the BOOTP / RARP server
+		 */
+		NetOurIP = 0;
+		NetServerIP = getenv_IPaddr ("serverip");
+		NetOurVLAN = getenv_VLAN("vlan");	/* VLANs must be read */
+		NetOurNativeVLAN = getenv_VLAN("nvlan");
+	case CDP:
+		NetOurVLAN = getenv_VLAN("vlan");	/* VLANs must be read */
+		NetOurNativeVLAN = getenv_VLAN("nvlan");
+		break;
+	default:
+		break;
+	}
+
+	switch (net_check_prereq (protocol)) {
+	case 1:
+		/* network not configured */
+		eth_halt();
+		return (-1);
+
+#ifdef CONFIG_NET_MULTI
+	case 2:
+		/* network device not configured */
+		break;
+#endif /* CONFIG_NET_MULTI */
+
+	case 0:
+#ifdef CONFIG_NET_MULTI
+		NetDevExists = 1;
+#endif
+		switch (protocol) {
+		case TFTP:
+			/* always use ARP to get server ethernet address */
+			TftpStart();
+			break;
+
+#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
+		case DHCP:
+			/* Start with a clean slate... */
+			BootpTry = 0;
+			NetOurIP = 0;
+			NetServerIP = getenv_IPaddr ("serverip");
+			DhcpRequest();		/* Basically same as BOOTP */
+			break;
+#endif /* CFG_CMD_DHCP */
+
+		case BOOTP:
+			BootpTry = 0;
+			BootpRequest ();
+			break;
+
+		case RARP:
+			RarpTry = 0;
+			RarpRequest ();
+			break;
+#if (CONFIG_COMMANDS & CFG_CMD_PING)
+		case PING:
+			PingStart();
+			break;
+#endif
+#if (CONFIG_COMMANDS & CFG_CMD_NFS)
+		case NFS:
+			NfsStart();
+			break;
+#endif
+#if (CONFIG_COMMANDS & CFG_CMD_CDP)
+		case CDP:
+			CDPStart();
+			break;
+#endif
+#ifdef CONFIG_NETCONSOLE
+		case NETCONS:
+			NcStart();
+			break;
+#endif
+#if (CONFIG_COMMANDS & CFG_CMD_SNTP)
+		case SNTP:
+			SntpStart();
+			break;
+#endif
+		default:
+			break;
+		}
+
+		NetBootFileXferSize = 0;
+		break;
+	}
+
+#if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
+#if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
+	/*
+	 * Echo the inverted link state to the fault LED.
+	 */
+	if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
+		status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
+	} else {
+		status_led_set (STATUS_LED_RED, STATUS_LED_ON);
+	}
+#endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
+#endif /* CONFIG_MII, ... */
+
+	/*
+	 *	Main packet reception loop.  Loop receiving packets until
+	 *	someone sets `NetState' to a state that terminates.
+	 */
+	for (;;) {
+		WATCHDOG_RESET();
+#ifdef CONFIG_SHOW_ACTIVITY
+		{
+			extern void show_activity(int arg);
+			show_activity(1);
+		}
+#endif
+		/*
+		 *	Check the ethernet for a new packet.  The ethernet
+		 *	receive routine will process it.
+		 */
+			eth_rx();
+
+		/*
+		 *	Abort if ctrl-c was pressed.
+		 */
+		if (ctrlc()) {
+			eth_halt();
+			puts ("\nAbort\n");
+			return (-1);
+		}
+
+		ArpTimeoutCheck();
+
+		/*
+		 *	Check for a timeout, and run the timeout handler
+		 *	if we have one.
+		 */
+		if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
+			thand_f *x;
+
+#if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
+#  if defined(CFG_FAULT_ECHO_LINK_DOWN) && \
+      defined(CONFIG_STATUS_LED) &&	   \
+      defined(STATUS_LED_RED)
+			/*
+			 * Echo the inverted link state to the fault LED.
+			 */
+			if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
+				status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
+			} else {
+				status_led_set (STATUS_LED_RED, STATUS_LED_ON);
+			}
+#  endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
+#endif /* CONFIG_MII, ... */
+			x = timeHandler;
+			timeHandler = (thand_f *)0;
+			(*x)();
+		}
+
+
+		switch (NetState) {
+
+		case NETLOOP_RESTART:
+#ifdef CONFIG_NET_MULTI
+			NetRestarted = 1;
+#endif
+			goto restart;
+
+		case NETLOOP_SUCCESS:
+			if (NetBootFileXferSize > 0) {
+				char buf[10];
+				printf("Bytes transferred = %ld (%lx hex)\n",
+					NetBootFileXferSize,
+					NetBootFileXferSize);
+				sprintf(buf, "%lx", NetBootFileXferSize);
+				setenv("filesize", buf);
+
+				sprintf(buf, "%lX", (unsigned long)load_addr);
+				setenv("fileaddr", buf);
+			}
+			eth_halt();
+			return NetBootFileXferSize;
+
+		case NETLOOP_FAIL:
+			return (-1);
+		}
+	}
+}
+
+/**********************************************************************/
+
+static void
+startAgainTimeout(void)
+{
+	NetState = NETLOOP_RESTART;
+}
+
+static void
+startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
+{
+	/* Totally ignore the packet */
+}
+
+void NetStartAgain (void)
+{
+	char *nretry;
+	int noretry = 0, once = 0;
+
+	if ((nretry = getenv ("netretry")) != NULL) {
+		noretry = (strcmp (nretry, "no") == 0);
+		once = (strcmp (nretry, "once") == 0);
+	}
+	if (noretry) {
+		eth_halt ();
+		NetState = NETLOOP_FAIL;
+		return;
+	}
+#ifndef CONFIG_NET_MULTI
+	NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
+	NetSetHandler (startAgainHandler);
+#else	/* !CONFIG_NET_MULTI*/
+	eth_halt ();
+	eth_try_another (!NetRestarted);
+	eth_init (gd->bd);
+	if (NetRestartWrap) {
+		NetRestartWrap = 0;
+		if (NetDevExists && !once) {
+			NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
+			NetSetHandler (startAgainHandler);
+		} else {
+			NetState = NETLOOP_FAIL;
+		}
+	} else {
+		NetState = NETLOOP_RESTART;
+	}
+#endif	/* CONFIG_NET_MULTI */
+}
+
+/**********************************************************************/
+/*
+ *	Miscelaneous bits.
+ */
+
+void
+NetSetHandler(rxhand_f * f)
+{
+	packetHandler = f;
+}
+
+
+void
+NetSetTimeout(ulong iv, thand_f * f)
+{
+	if (iv == 0) {
+		timeHandler = (thand_f *)0;
+	} else {
+		timeHandler = f;
+		timeStart = get_timer(0);
+		timeDelta = iv;
+	}
+}
+
+
+void
+NetSendPacket(volatile uchar * pkt, int len)
+{
+	(void) eth_send(pkt, len);
+}
+
+int
+NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
+{
+	uchar *pkt;
+
+	/* convert to new style broadcast */
+	if (dest == 0)
+		dest = 0xFFFFFFFF;
+
+	/* if broadcast, make the ether address a broadcast and don't do ARP */
+	if (dest == 0xFFFFFFFF)
+		ether = NetBcastAddr;
+
+	/* if MAC address was not discovered yet, save the packet and do an ARP request */
+	if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
+
+#ifdef ET_DEBUG
+		printf("sending ARP for %08lx\n", dest);
+#endif
+		NetArpWaitPacketIP = dest;
+		NetArpWaitPacketMAC = ether;
+
+		pkt = NetArpWaitTxPacket;
+		pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
+
+		NetSetIP (pkt, dest, dport, sport, len);
+		memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
+
+		/* size of the waiting packet */
+		NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
+
+		/* and do the ARP request */
+		NetArpWaitTry = 1;
+		NetArpWaitTimerStart = get_timer(0);
+		ArpRequest();
+		return 1;	/* waiting */
+	}
+
+#ifdef ET_DEBUG
+	printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
+		dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
+#endif
+
+	pkt = (uchar *)NetTxPacket;
+	pkt += NetSetEther (pkt, ether, PROT_IP);
+	NetSetIP (pkt, dest, dport, sport, len);
+	(void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
+
+	return 0;	/* transmitted */
+}
+
+#if (CONFIG_COMMANDS & CFG_CMD_PING)
+static ushort PingSeqNo;
+
+int PingSend(void)
+{
+	static uchar mac[6];
+	volatile IP_t *ip;
+	volatile ushort *s;
+	uchar *pkt;
+
+	/* XXX always send arp request */
+
+	memcpy(mac, NetEtherNullAddr, 6);
+
+#ifdef ET_DEBUG
+	printf("sending ARP for %08lx\n", NetPingIP);
+#endif
+
+	NetArpWaitPacketIP = NetPingIP;
+	NetArpWaitPacketMAC = mac;
+
+	pkt = NetArpWaitTxPacket;
+	pkt += NetSetEther(pkt, mac, PROT_IP);
+
+	ip = (volatile IP_t *)pkt;
+
+	/*
+	 *	Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
+	 */
+	ip->ip_hl_v  = 0x45;		/* IP_HDR_SIZE / 4 (not including UDP) */
+	ip->ip_tos   = 0;
+	ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
+	ip->ip_id    = htons(NetIPID++);
+	ip->ip_off   = htons(0x4000);	/* No fragmentation */
+	ip->ip_ttl   = 255;
+	ip->ip_p     = 0x01;		/* ICMP */
+	ip->ip_sum   = 0;
+	NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
+	NetCopyIP((void*)&ip->ip_dst, &NetPingIP);	   /* - "" - */
+	ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
+
+	s = &ip->udp_src;		/* XXX ICMP starts here */
+	s[0] = htons(0x0800);		/* echo-request, code */
+	s[1] = 0;			/* checksum */
+	s[2] = 0; 			/* identifier */
+	s[3] = htons(PingSeqNo++);	/* sequence number */
+	s[1] = ~NetCksum((uchar *)s, 8/2);
+
+	/* size of the waiting packet */
+	NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
+
+	/* and do the ARP request */
+	NetArpWaitTry = 1;
+	NetArpWaitTimerStart = get_timer(0);
+	ArpRequest();
+	return 1;	/* waiting */
+}
+
+static void
+PingTimeout (void)
+{
+	eth_halt();
+	NetState = NETLOOP_FAIL;	/* we did not get the reply */
+}
+
+static void
+PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
+{
+	IPaddr_t tmp;
+	volatile IP_t *ip = (volatile IP_t *)pkt;
+
+	tmp = NetReadIP((void *)&ip->ip_src);
+	if (tmp != NetPingIP)
+		return;
+
+	NetState = NETLOOP_SUCCESS;
+}
+
+static void PingStart(void)
+{
+#if defined(CONFIG_NET_MULTI)
+	printf ("Using %s device\n", eth_get_name());
+#endif	/* CONFIG_NET_MULTI */
+	NetSetTimeout (10 * CFG_HZ, PingTimeout);
+	NetSetHandler (PingHandler);
+
+	PingSend();
+}
+#endif	/* CFG_CMD_PING */
+
+#if (CONFIG_COMMANDS & CFG_CMD_CDP)
+
+#define CDP_DEVICE_ID_TLV		0x0001
+#define CDP_ADDRESS_TLV			0x0002
+#define CDP_PORT_ID_TLV			0x0003
+#define CDP_CAPABILITIES_TLV		0x0004
+#define CDP_VERSION_TLV			0x0005
+#define CDP_PLATFORM_TLV		0x0006
+#define CDP_NATIVE_VLAN_TLV		0x000a
+#define CDP_APPLIANCE_VLAN_TLV		0x000e
+#define CDP_TRIGGER_TLV			0x000f
+#define CDP_POWER_CONSUMPTION_TLV	0x0010
+#define CDP_SYSNAME_TLV			0x0014
+#define CDP_SYSOBJECT_TLV		0x0015
+#define CDP_MANAGEMENT_ADDRESS_TLV	0x0016
+
+#define CDP_TIMEOUT			(CFG_HZ/4)	/* one packet every 250ms */
+
+static int CDPSeq;
+static int CDPOK;
+
+ushort CDPNativeVLAN;
+ushort CDPApplianceVLAN;
+
+static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
+
+static ushort CDP_compute_csum(const uchar *buff, ushort len)
+{
+	ushort csum;
+	int     odd;
+	ulong   result = 0;
+	ushort  leftover;
+	ushort *p;
+
+	if (len > 0) {
+		odd = 1 & (ulong)buff;
+		if (odd) {
+			result = *buff << 8;
+			len--;
+			buff++;
+		}
+		while (len > 1) {
+			p = (ushort *)buff;
+			result += *p++;
+			buff = (uchar *)p;
+			if (result & 0x80000000)
+				result = (result & 0xFFFF) + (result >> 16);
+			len -= 2;
+		}
+		if (len) {
+			leftover = (signed short)(*(const signed char *)buff);
+			/* CISCO SUCKS big time! (and blows too):
+			 * CDP uses the IP checksum algorithm with a twist;
+			 * for the last byte it *sign* extends and sums.
+			 */
+			result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
+		}
+		while (result >> 16)
+			result = (result & 0xFFFF) + (result >> 16);
+
+		if (odd)
+			result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
+	}
+
+	/* add up 16-bit and 17-bit words for 17+c bits */
+	result = (result & 0xffff) + (result >> 16);
+	/* add up 16-bit and 2-bit for 16+c bit */
+	result = (result & 0xffff) + (result >> 16);
+	/* add up carry.. */
+	result = (result & 0xffff) + (result >> 16);
+
+	/* negate */
+	csum = ~(ushort)result;
+
+	/* run time endian detection */
+	if (csum != htons(csum))	/* little endian */
+		csum = htons(csum);
+
+	return csum;
+}
+
+int CDPSendTrigger(void)
+{
+	volatile uchar *pkt;
+	volatile ushort *s;
+	volatile ushort *cp;
+	Ethernet_t *et;
+	int len;
+	ushort chksum;
+#if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
+    defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
+	char buf[32];
+#endif
+
+	pkt = NetTxPacket;
+	et = (Ethernet_t *)pkt;
+
+	/* NOTE: trigger sent not on any VLAN */
+
+	/* form ethernet header */
+	memcpy(et->et_dest, NetCDPAddr, 6);
+	memcpy(et->et_src, NetOurEther, 6);
+
+	pkt += ETHER_HDR_SIZE;
+
+	/* SNAP header */
+	memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
+	pkt += sizeof(CDP_SNAP_hdr);
+
+	/* CDP header */
+	*pkt++ = 0x02;				/* CDP version 2 */
+	*pkt++ = 180;				/* TTL */
+	s = (volatile ushort *)pkt;
+	cp = s;
+	*s++ = htons(0);			/* checksum (0 for later calculation) */
+
+	/* CDP fields */
+#ifdef CONFIG_CDP_DEVICE_ID
+	*s++ = htons(CDP_DEVICE_ID_TLV);
+	*s++ = htons(CONFIG_CDP_DEVICE_ID);
+	memset(buf, 0, sizeof(buf));
+	sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
+		NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
+		NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
+		NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
+	memcpy((uchar *)s, buf, 16);
+	s += 16 / 2;
+#endif
+
+#ifdef CONFIG_CDP_PORT_ID
+	*s++ = htons(CDP_PORT_ID_TLV);
+	memset(buf, 0, sizeof(buf));
+	sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
+	len = strlen(buf);
+	if (len & 1)	/* make it even */
+		len++;
+	*s++ = htons(len + 4);
+	memcpy((uchar *)s, buf, len);
+	s += len / 2;
+#endif
+
+#ifdef CONFIG_CDP_CAPABILITIES
+	*s++ = htons(CDP_CAPABILITIES_TLV);
+	*s++ = htons(8);
+	*(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
+	s += 2;
+#endif
+
+#ifdef CONFIG_CDP_VERSION
+	*s++ = htons(CDP_VERSION_TLV);
+	memset(buf, 0, sizeof(buf));
+	strcpy(buf, CONFIG_CDP_VERSION);
+	len = strlen(buf);
+	if (len & 1)	/* make it even */
+		len++;
+	*s++ = htons(len + 4);
+	memcpy((uchar *)s, buf, len);
+	s += len / 2;
+#endif
+
+#ifdef CONFIG_CDP_PLATFORM
+	*s++ = htons(CDP_PLATFORM_TLV);
+	memset(buf, 0, sizeof(buf));
+	strcpy(buf, CONFIG_CDP_PLATFORM);
+	len = strlen(buf);
+	if (len & 1)	/* make it even */
+		len++;
+	*s++ = htons(len + 4);
+	memcpy((uchar *)s, buf, len);
+	s += len / 2;
+#endif
+
+#ifdef CONFIG_CDP_TRIGGER
+	*s++ = htons(CDP_TRIGGER_TLV);
+	*s++ = htons(8);
+	*(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
+	s += 2;
+#endif
+
+#ifdef CONFIG_CDP_POWER_CONSUMPTION
+	*s++ = htons(CDP_POWER_CONSUMPTION_TLV);
+	*s++ = htons(6);
+	*s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
+#endif
+
+	/* length of ethernet packet */
+	len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
+	et->et_protlen = htons(len);
+
+	len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
+	chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
+	if (chksum == 0)
+		chksum = 0xFFFF;
+	*cp = htons(chksum);
+
+	(void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
+	return 0;
+}
+
+static void
+CDPTimeout (void)
+{
+	CDPSeq++;
+
+	if (CDPSeq < 3) {
+		NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
+		CDPSendTrigger();
+		return;
+	}
+
+	/* if not OK try again */
+	if (!CDPOK)
+		NetStartAgain();
+	else
+		NetState = NETLOOP_SUCCESS;
+}
+
+static void
+CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
+{
+	/* nothing */
+}
+
+static void
+CDPHandler(const uchar * pkt, unsigned len)
+{
+	const uchar *t;
+	const ushort *ss;
+	ushort type, tlen;
+	uchar applid;
+	ushort vlan, nvlan;
+
+	/* minimum size? */
+	if (len < sizeof(CDP_SNAP_hdr) + 4)
+		goto pkt_short;
+
+	/* check for valid CDP SNAP header */
+	if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
+		return;
+
+	pkt += sizeof(CDP_SNAP_hdr);
+	len -= sizeof(CDP_SNAP_hdr);
+
+	/* Version of CDP protocol must be >= 2 and TTL != 0 */
+	if (pkt[0] < 0x02 || pkt[1] == 0)
+		return;
+
+	/* if version is greater than 0x02 maybe we'll have a problem; output a warning */
+	if (pkt[0] != 0x02)
+		printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
+				pkt[0] & 0xff);
+
+	if (CDP_compute_csum(pkt, len) != 0)
+		return;
+
+	pkt += 4;
+	len -= 4;
+
+	vlan = htons(-1);
+	nvlan = htons(-1);
+	while (len > 0) {
+		if (len < 4)
+			goto pkt_short;
+
+		ss = (const ushort *)pkt;
+		type = ntohs(ss[0]);
+		tlen = ntohs(ss[1]);
+		if (tlen > len) {
+			goto pkt_short;
+		}
+
+		pkt += tlen;
+		len -= tlen;
+
+		ss += 2;	/* point ss to the data of the TLV */
+		tlen -= 4;
+
+		switch (type) {
+			case CDP_DEVICE_ID_TLV:
+				break;
+			case CDP_ADDRESS_TLV:
+				break;
+			case CDP_PORT_ID_TLV:
+				break;
+			case CDP_CAPABILITIES_TLV:
+				break;
+			case CDP_VERSION_TLV:
+				break;
+			case CDP_PLATFORM_TLV:
+				break;
+			case CDP_NATIVE_VLAN_TLV:
+				nvlan = *ss;
+				break;
+			case CDP_APPLIANCE_VLAN_TLV:
+				t = (const uchar *)ss;
+				while (tlen > 0) {
+					if (tlen < 3)
+						goto pkt_short;
+
+					applid = t[0];
+					ss = (const ushort *)(t + 1);
+
+#ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
+					if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
+						vlan = *ss;
+#else
+					vlan = ntohs(*ss);	/* XXX will this work; dunno */
+#endif
+					t += 3; tlen -= 3;
+				}
+				break;
+			case CDP_TRIGGER_TLV:
+				break;
+			case CDP_POWER_CONSUMPTION_TLV:
+				break;
+			case CDP_SYSNAME_TLV:
+				break;
+			case CDP_SYSOBJECT_TLV:
+				break;
+			case CDP_MANAGEMENT_ADDRESS_TLV:
+				break;
+		}
+	}
+
+	CDPApplianceVLAN = vlan;
+	CDPNativeVLAN = nvlan;
+
+	CDPOK = 1;
+	return;
+
+ pkt_short:
+	printf("** CDP packet is too short\n");
+	return;
+}
+
+static void CDPStart(void)
+{
+#if defined(CONFIG_NET_MULTI)
+	printf ("Using %s device\n", eth_get_name());
+#endif
+	CDPSeq = 0;
+	CDPOK = 0;
+
+	CDPNativeVLAN = htons(-1);
+	CDPApplianceVLAN = htons(-1);
+
+	NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
+	NetSetHandler (CDPDummyHandler);
+
+	CDPSendTrigger();
+}
+#endif	/* CFG_CMD_CDP */
+
+
+void
+NetReceive(volatile uchar * inpkt, int len)
+{
+	Ethernet_t *et;
+	IP_t	*ip;
+	ARP_t	*arp;
+	IPaddr_t tmp;
+	int	x;
+	uchar *pkt;
+#if (CONFIG_COMMANDS & CFG_CMD_CDP)
+	int iscdp;
+#endif
+	ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
+
+#ifdef ET_DEBUG
+	printf("packet received\n");
+#endif
+
+	NetRxPkt = inpkt;
+	NetRxPktLen = len;
+	et = (Ethernet_t *)inpkt;
+
+	/* too small packet? */
+	if (len < ETHER_HDR_SIZE)
+		return;
+
+#if (CONFIG_COMMANDS & CFG_CMD_CDP)
+	/* keep track if packet is CDP */
+	iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
+#endif
+
+	myvlanid = ntohs(NetOurVLAN);
+	if (myvlanid == (ushort)-1)
+		myvlanid = VLAN_NONE;
+	mynvlanid = ntohs(NetOurNativeVLAN);
+	if (mynvlanid == (ushort)-1)
+		mynvlanid = VLAN_NONE;
+
+	x = ntohs(et->et_protlen);
+
+#ifdef ET_DEBUG
+	printf("packet received\n");
+#endif
+
+	if (x < 1514) {
+		/*
+		 *	Got a 802 packet.  Check the other protocol field.
+		 */
+		x = ntohs(et->et_prot);
+
+		ip = (IP_t *)(inpkt + E802_HDR_SIZE);
+		len -= E802_HDR_SIZE;
+
+	} else if (x != PROT_VLAN) {	/* normal packet */
+		ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
+		len -= ETHER_HDR_SIZE;
+
+	} else {			/* VLAN packet */
+		VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
+
+#ifdef ET_DEBUG
+		printf("VLAN packet received\n");
+#endif
+		/* too small packet? */
+		if (len < VLAN_ETHER_HDR_SIZE)
+			return;
+
+		/* if no VLAN active */
+		if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
+#if (CONFIG_COMMANDS & CFG_CMD_CDP)
+				&& iscdp == 0
+#endif
+				)
+			return;
+
+		cti = ntohs(vet->vet_tag);
+		vlanid = cti & VLAN_IDMASK;
+		x = ntohs(vet->vet_type);
+
+		ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
+		len -= VLAN_ETHER_HDR_SIZE;
+	}
+
+#ifdef ET_DEBUG
+	printf("Receive from protocol 0x%x\n", x);
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_CDP)
+	if (iscdp) {
+		CDPHandler((uchar *)ip, len);
+		return;
+	}
+#endif
+
+	if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
+		if (vlanid == VLAN_NONE)
+			vlanid = (mynvlanid & VLAN_IDMASK);
+		/* not matched? */
+		if (vlanid != (myvlanid & VLAN_IDMASK))
+			return;
+	}
+
+	switch (x) {
+
+	case PROT_ARP:
+		/*
+		 * We have to deal with two types of ARP packets:
+		 * - REQUEST packets will be answered by sending  our
+		 *   IP address - if we know it.
+		 * - REPLY packates are expected only after we asked
+		 *   for the TFTP server's or the gateway's ethernet
+		 *   address; so if we receive such a packet, we set
+		 *   the server ethernet address
+		 */
+#ifdef ET_DEBUG
+		puts ("Got ARP\n");
+#endif
+		arp = (ARP_t *)ip;
+		if (len < ARP_HDR_SIZE) {
+			printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
+			return;
+		}
+		if (ntohs(arp->ar_hrd) != ARP_ETHER) {
+			return;
+		}
+		if (ntohs(arp->ar_pro) != PROT_IP) {
+			return;
+		}
+		if (arp->ar_hln != 6) {
+			return;
+		}
+		if (arp->ar_pln != 4) {
+			return;
+		}
+
+		if (NetOurIP == 0) {
+			return;
+		}
+
+		if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
+			return;
+		}
+
+		switch (ntohs(arp->ar_op)) {
+		case ARPOP_REQUEST:		/* reply with our IP address	*/
+#ifdef ET_DEBUG
+			puts ("Got ARP REQUEST, return our IP\n");
+#endif
+			pkt = (uchar *)et;
+			pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
+			arp->ar_op = htons(ARPOP_REPLY);
+			memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
+			NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
+			memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
+			NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
+			(void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
+			return;
+
+		case ARPOP_REPLY:		/* arp reply */
+			/* are we waiting for a reply */
+			if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
+				break;
+#ifdef ET_DEBUG
+			printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
+				arp->ar_data[0], arp->ar_data[1],
+				arp->ar_data[2], arp->ar_data[3],
+				arp->ar_data[4], arp->ar_data[5]);
+#endif
+
+			tmp = NetReadIP(&arp->ar_data[6]);
+
+			/* matched waiting packet's address */
+			if (tmp == NetArpWaitReplyIP) {
+#ifdef ET_DEBUG
+				puts ("Got it\n");
+#endif
+				/* save address for later use */
+				memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
+
+#ifdef CONFIG_NETCONSOLE
+				(*packetHandler)(0,0,0,0);
+#endif
+				/* modify header, and transmit it */
+				memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
+				(void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
+
+				/* no arp request pending now */
+				NetArpWaitPacketIP = 0;
+				NetArpWaitTxPacketSize = 0;
+				NetArpWaitPacketMAC = NULL;
+
+			}
+			return;
+		default:
+#ifdef ET_DEBUG
+			printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
+#endif
+			return;
+		}
+		break;
+
+	case PROT_RARP:
+#ifdef ET_DEBUG
+		puts ("Got RARP\n");
+#endif
+		arp = (ARP_t *)ip;
+		if (len < ARP_HDR_SIZE) {
+			printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
+			return;
+		}
+
+		if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
+			(ntohs(arp->ar_hrd) != ARP_ETHER)   ||
+			(ntohs(arp->ar_pro) != PROT_IP)     ||
+			(arp->ar_hln != 6) || (arp->ar_pln != 4)) {
+
+			puts ("invalid RARP header\n");
+		} else {
+			NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
+			if (NetServerIP == 0)
+				NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
+			memcpy (NetServerEther, &arp->ar_data[ 0], 6);
+
+			(*packetHandler)(0,0,0,0);
+		}
+		break;
+
+	case PROT_IP:
+#ifdef ET_DEBUG
+		puts ("Got IP\n");
+#endif
+		if (len < IP_HDR_SIZE) {
+			debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
+			return;
+		}
+		if (len < ntohs(ip->ip_len)) {
+			printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
+			return;
+		}
+		len = ntohs(ip->ip_len);
+#ifdef ET_DEBUG
+		printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
+#endif
+		if ((ip->ip_hl_v & 0xf0) != 0x40) {
+			return;
+		}
+		if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
+			return;
+		}
+		if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
+			puts ("checksum bad\n");
+			return;
+		}
+		tmp = NetReadIP(&ip->ip_dst);
+		if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
+			return;
+		}
+		/*
+		 * watch for ICMP host redirects
+		 *
+		 * There is no real handler code (yet). We just watch
+		 * for ICMP host redirect messages. In case anybody
+		 * sees these messages: please contact me
+		 * (wd@denx.de), or - even better - send me the
+		 * necessary fixes :-)
+		 *
+		 * Note: in all cases where I have seen this so far
+		 * it was a problem with the router configuration,
+		 * for instance when a router was configured in the
+		 * BOOTP reply, but the TFTP server was on the same
+		 * subnet. So this is probably a warning that your
+		 * configuration might be wrong. But I'm not really
+		 * sure if there aren't any other situations.
+		 */
+		if (ip->ip_p == IPPROTO_ICMP) {
+			ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
+
+			switch (icmph->type) {
+			case ICMP_REDIRECT:
+				if (icmph->code != ICMP_REDIR_HOST)
+					return;
+				puts (" ICMP Host Redirect to ");
+				print_IPaddr(icmph->un.gateway);
+				putc(' ');
+				return;
+#if (CONFIG_COMMANDS & CFG_CMD_PING)
+			case ICMP_ECHO_REPLY:
+				/*
+				 *	IP header OK.  Pass the packet to the current handler.
+				 */
+				/* XXX point to ip packet */
+				(*packetHandler)((uchar *)ip, 0, 0, 0);
+				return;
+#endif
+			default:
+				return;
+			}
+		} else if (ip->ip_p != IPPROTO_UDP) {	/* Only UDP packets */
+			return;
+		}
+
+#ifdef CONFIG_UDP_CHECKSUM
+		if (ip->udp_xsum != 0) {
+			ulong   xsum;
+			ushort *sumptr;
+			ushort  sumlen;
+
+			xsum  = ip->ip_p;
+			xsum += (ntohs(ip->udp_len));
+			xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
+			xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
+			xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
+			xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
+
+			sumlen = ntohs(ip->udp_len);
+			sumptr = (ushort *) &(ip->udp_src);
+
+			while (sumlen > 1) {
+				ushort sumdata;
+
+				sumdata = *sumptr++;
+				xsum += ntohs(sumdata);
+				sumlen -= 2;
+			}
+			if (sumlen > 0) {
+				ushort sumdata;
+
+				sumdata = *(unsigned char *) sumptr;
+				sumdata = (sumdata << 8) & 0xff00;
+				xsum += sumdata;
+			}
+			while ((xsum >> 16) != 0) {
+				xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
+			}
+			if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
+				printf(" UDP wrong checksum %08x %08x\n", xsum, ntohs(ip->udp_xsum));
+				return;
+			}
+		}
+#endif
+
+#ifdef CONFIG_NETCONSOLE
+		nc_input_packet((uchar *)ip +IP_HDR_SIZE,
+						ntohs(ip->udp_dst),
+						ntohs(ip->udp_src),
+						ntohs(ip->udp_len) - 8);
+#endif
+		/*
+		 *	IP header OK.  Pass the packet to the current handler.
+		 */
+		(*packetHandler)((uchar *)ip +IP_HDR_SIZE,
+						ntohs(ip->udp_dst),
+						ntohs(ip->udp_src),
+						ntohs(ip->udp_len) - 8);
+		break;
+	}
+}
+
+
+/**********************************************************************/
+
+static int net_check_prereq (proto_t protocol)
+{
+	switch (protocol) {
+		/* Fall through */
+#if (CONFIG_COMMANDS & CFG_CMD_PING)
+	case PING:
+		if (NetPingIP == 0) {
+			puts ("*** ERROR: ping address not given\n");
+			return (1);
+		}
+		goto common;
+#endif
+#if (CONFIG_COMMANDS & CFG_CMD_SNTP)
+	case SNTP:
+		if (NetNtpServerIP == 0) {
+			puts ("*** ERROR: NTP server address not given\n");
+			return (1);
+		}
+		goto common;
+#endif
+#if (CONFIG_COMMANDS & CFG_CMD_NFS)
+	case NFS:
+#endif
+	case NETCONS:
+	case TFTP:
+		if (NetServerIP == 0) {
+			puts ("*** ERROR: `serverip' not set\n");
+			return (1);
+		}
+#if (CONFIG_COMMANDS & (CFG_CMD_PING | CFG_CMD_SNTP))
+    common:
+#endif
+
+		if (NetOurIP == 0) {
+			puts ("*** ERROR: `ipaddr' not set\n");
+			return (1);
+		}
+		/* Fall through */
+
+	case DHCP:
+	case RARP:
+	case BOOTP:
+	case CDP:
+		if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
+#ifdef CONFIG_NET_MULTI
+			extern int eth_get_dev_index (void);
+			int num = eth_get_dev_index ();
+
+			switch (num) {
+			case -1:
+				puts ("*** ERROR: No ethernet found.\n");
+				return (1);
+			case 0:
+				puts ("*** ERROR: `ethaddr' not set\n");
+				break;
+			default:
+				printf ("*** ERROR: `eth%daddr' not set\n",
+					num);
+				break;
+			}
+
+			NetStartAgain ();
+			return (2);
+#else
+			puts ("*** ERROR: `ethaddr' not set\n");
+			return (1);
+#endif
+		}
+		/* Fall through */
+	default:
+		return (0);
+	}
+	return (0);		/* OK */
+}
+/**********************************************************************/
+
+int
+NetCksumOk(uchar * ptr, int len)
+{
+	return !((NetCksum(ptr, len) + 1) & 0xfffe);
+}
+
+
+unsigned
+NetCksum(uchar * ptr, int len)
+{
+	ulong	xsum;
+	ushort *p = (ushort *)ptr;
+
+	xsum = 0;
+	while (len-- > 0)
+		xsum += *p++;
+	xsum = (xsum & 0xffff) + (xsum >> 16);
+	xsum = (xsum & 0xffff) + (xsum >> 16);
+	return (xsum & 0xffff);
+}
+
+int
+NetEthHdrSize(void)
+{
+	ushort myvlanid;
+
+	myvlanid = ntohs(NetOurVLAN);
+	if (myvlanid == (ushort)-1)
+		myvlanid = VLAN_NONE;
+
+	return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
+}
+
+int
+NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
+{
+	Ethernet_t *et = (Ethernet_t *)xet;
+	ushort myvlanid;
+
+	myvlanid = ntohs(NetOurVLAN);
+	if (myvlanid == (ushort)-1)
+		myvlanid = VLAN_NONE;
+
+	memcpy (et->et_dest, addr, 6);
+	memcpy (et->et_src, NetOurEther, 6);
+	if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
+	et->et_protlen = htons(prot);
+		return ETHER_HDR_SIZE;
+	} else {
+		VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
+
+		vet->vet_vlan_type = htons(PROT_VLAN);
+		vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
+		vet->vet_type = htons(prot);
+		return VLAN_ETHER_HDR_SIZE;
+	}
+}
+
+void
+NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
+{
+	volatile IP_t *ip = (IP_t *)xip;
+
+	/*
+	 *	If the data is an odd number of bytes, zero the
+	 *	byte after the last byte so that the checksum
+	 *	will work.
+	 */
+	if (len & 1)
+		xip[IP_HDR_SIZE + len] = 0;
+
+	/*
+	 *	Construct an IP and UDP header.
+	 *	(need to set no fragment bit - XXX)
+	 */
+	ip->ip_hl_v  = 0x45;		/* IP_HDR_SIZE / 4 (not including UDP) */
+	ip->ip_tos   = 0;
+	ip->ip_len   = htons(IP_HDR_SIZE + len);
+	ip->ip_id    = htons(NetIPID++);
+	ip->ip_off   = htons(0x4000);	/* No fragmentation */
+	ip->ip_ttl   = 255;
+	ip->ip_p     = 17;		/* UDP */
+	ip->ip_sum   = 0;
+	NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
+	NetCopyIP((void*)&ip->ip_dst, &dest);	   /* - "" - */
+	ip->udp_src  = htons(sport);
+	ip->udp_dst  = htons(dport);
+	ip->udp_len  = htons(8 + len);
+	ip->udp_xsum = 0;
+	ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
+}
+
+void copy_filename (char *dst, char *src, int size)
+{
+	if (*src && (*src == '"')) {
+		++src;
+		--size;
+	}
+
+	while ((--size > 0) && *src && (*src != '"')) {
+		*dst++ = *src++;
+	}
+	*dst = '\0';
+}
+
+#endif /* CFG_CMD_NET */
+
+void ip_to_string (IPaddr_t x, char *s)
+{
+	x = ntohl (x);
+	sprintf (s, "%d.%d.%d.%d",
+		 (int) ((x >> 24) & 0xff),
+		 (int) ((x >> 16) & 0xff),
+		 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
+	);
+}
+
+IPaddr_t string_to_ip(char *s)
+{
+	IPaddr_t addr;
+	char *e;
+	int i;
+
+	if (s == NULL)
+		return(0);
+
+	for (addr=0, i=0; i<4; ++i) {
+		ulong val = s ? simple_strtoul(s, &e, 10) : 0;
+		addr <<= 8;
+		addr |= (val & 0xFF);
+		if (s) {
+			s = (*e) ? e+1 : e;
+		}
+	}
+
+	return (htonl(addr));
+}
+
+void VLAN_to_string(ushort x, char *s)
+{
+	x = ntohs(x);
+
+	if (x == (ushort)-1)
+		x = VLAN_NONE;
+
+	if (x == VLAN_NONE)
+		strcpy(s, "none");
+	else
+		sprintf(s, "%d", x & VLAN_IDMASK);
+}
+
+ushort string_to_VLAN(char *s)
+{
+	ushort id;
+
+	if (s == NULL)
+		return htons(VLAN_NONE);
+
+	if (*s < '0' || *s > '9')
+		id = VLAN_NONE;
+	else
+		id = (ushort)simple_strtoul(s, NULL, 10);
+
+	return htons(id);
+}
+
+void print_IPaddr (IPaddr_t x)
+{
+	char tmp[16];
+
+	ip_to_string (x, tmp);
+
+	puts (tmp);
+}
+
+IPaddr_t getenv_IPaddr (char *var)
+{
+	return (string_to_ip(getenv(var)));
+}
+
+ushort getenv_VLAN(char *var)
+{
+	return (string_to_VLAN(getenv(var)));
+}