Add support for console over UDP (compatible to Ingo Molnar's

netconsole patch under Linux)

CHANGELOG

@@ -2,6 +2,9 @@
 Changes since U-Boot 1.1.1:
 ======================================================================
 
+* Add support for console over UDP (compatible to Ingo Molnar's
+  netconsole patch under Linux)
+
 * Patch by Jon Loeliger, 16 Jul 2004:
   - support larger DDR memories up to 2G on the PC8540/8560ADS and
     STXGP3 boards

common/devices.c

@@ -201,6 +201,9 @@ int devices_init (void)
 #ifdef CONFIG_USB_TTY
 	drv_usbtty_init ();
 #endif
+#ifdef CONFIG_NETCONSOLE
+	drv_nc_init ();
+#endif
 
 	return (0);
 }

doc/README.NetConsole

@@ -0,0 +1,68 @@
+
+In U-Boot, we implemented the networked console via the standard
+"devices" mechanism, which means that you can switch between the
+serial and network input/output devices by adjusting the 'stdin' and
+'stdout' environment variables. To switch to the networked console,
+set either of these variables to "nc". Input and output can be
+switched independently.
+
+On the host side, please use this script to access the console:
+
++++++++++++++++++++++++++++++++++++++++++++
+#! /bin/bash
+
+TARGET_IP=$1
+
+stty -icanon -echo intr ^T
+nc -u -l -p 6666 < /dev/null &
+nc -u ${TARGET_IP} 6666
+stty icanon echo intr ^C
++++++++++++++++++++++++++++++++++++++++++++
+
+For Linux, the network-based console needs special configuration.
+Minimally, the host IP address needs to be specified. This can be
+done either via the kernel command line, or by passing parameters
+while loading the netconsole.o module (when used in a loadable module
+configuration). Please refer to Documentation/networking/logging.txt
+file for the original Ingo Molnar's documentation on how to pass
+parameters to the loadable module.
+
+The format of the kernel command line parameter (for the static
+configuration) is as follows:
+
+  netconsole=[src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
+
+where
+
+  src-port	source for UDP packets
+		(defaults to 6665)
+  src-ip	source IP to use
+		(defaults to the interface's address)
+  dev		network interface
+		(defaults to eth0)
+  tgt-port	port for logging agent
+		(defaults to 6666)
+  tgt-ip	IP address for logging agent
+		(this is the required parameter)
+  tgt-macaddr	ethernet MAC address for logging agent
+		(defaults to broadcast)
+
+Examples:
+
+  netconsole=4444@10.0.0.1/eth1,9353@10.0.0.2/12:34:56:78:9a:bc
+
+or
+
+  netconsole=@/,@192.168.3.1/
+
+Please note that for the Linux networked console to work, the
+ethernet interface has to be up by the time the netconsole driver is
+initialized. This means that in case of static kernel configuration,
+the respective Ethernet interface has to be brought up using the "IP
+Autoconfiguration" kernel feature, which is usually done by defaults
+in the ELDK-NFS-based environment.
+
+To browse the Linux network console output, use the 'netcat' tool invoked
+as follows:
+
+	nc -u -l -p 6666

drivers/Makefile

@@ -32,7 +32,7 @@ OBJS	= 3c589.o 5701rls.o ali512x.o \
 	  cs8900.o ct69000.o dataflash.o dc2114x.o dm9000x.o \
 	  e1000.o eepro100.o \
 	  i8042.o i82365.o inca-ip_sw.o keyboard.o \
-	  lan91c96.o natsemi.o netarm_eth.o \
+	  lan91c96.o natsemi.o netarm_eth.o netconsole.o \
 	  ns16550.o ns8382x.o ns87308.o omap1510_i2c.o \
 	  pci.o pci_auto.o pci_indirect.o \
 	  pcnet.o plb2800_eth.o \

drivers/netconsole.c

@@ -0,0 +1,204 @@
+/*
+ * (C) Copyright 2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_NETCONSOLE
+
+#include <command.h>
+#include <devices.h>
+#include <net.h>
+
+#ifndef CONFIG_NET_MULTI
+#error define CONFIG_NET_MULTI to use netconsole
+#endif
+
+static uchar nc_buf = 0;	/* input buffer */
+static int input_recursion = 0;
+static int output_recursion = 0;
+static int net_timeout;
+
+static void nc_wait_arp_handler (uchar * pkt, unsigned dest, unsigned src,
+				 unsigned len)
+{
+	NetState = NETLOOP_SUCCESS;	/* got arp reply - quit net loop */
+}
+
+static void nc_handler (uchar * pkt, unsigned dest, unsigned src,
+			unsigned len)
+{
+	if (nc_buf)
+		NetState = NETLOOP_SUCCESS;	/* got input - quit net loop */
+}
+
+static void nc_timeout (void)
+{
+	NetState = NETLOOP_SUCCESS;
+}
+
+void NcStart (void)
+{
+	if (memcmp (NetServerEther, NetEtherNullAddr, 6)) {
+		/* going to check for input packet */
+		NetSetHandler (nc_handler);
+		NetSetTimeout (net_timeout, nc_timeout);
+	} else {
+		/* send arp request */
+		NetSetHandler (nc_wait_arp_handler);
+		NetSendUDPPacket (NetServerEther, NetServerIP, 6665, 6666, 0);
+	}
+}
+
+int nc_input_packet (uchar * pkt, unsigned dest, unsigned src, unsigned len)
+{
+	if (dest != 6666 || !len)
+		return 0;		/* not for us */
+
+	nc_buf = *pkt;
+	return 1;
+}
+
+static void nc_send_packet (const char *buf, int len)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	struct eth_device *eth;
+	int inited = 0;
+	uchar *pkt;
+
+	if (!memcmp (NetServerEther, NetEtherNullAddr, 6))
+		return;
+
+	if ((eth = eth_get_dev ()) == NULL) {
+		return;
+	}
+
+	if (eth->state != ETH_STATE_ACTIVE) {
+		if (eth_init (gd->bd) < 0)
+			return;
+		inited = 1;
+	}
+	pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE;
+	memcpy (pkt, buf, len);
+	NetSendUDPPacket (NetServerEther, NetServerIP, 6666, 6665, len);
+
+	if (inited)
+		eth_halt ();
+}
+
+int nc_start (void)
+{
+	if (memcmp (NetServerEther, NetEtherNullAddr, 6))
+		return 0;
+
+	return NetLoop (NETCONS);	/* wait for arp reply */
+}
+
+void nc_putc (char c)
+{
+	if (output_recursion)
+		return;
+	output_recursion = 1;
+
+	nc_send_packet (&c, 1);
+
+	output_recursion = 0;
+}
+
+void nc_puts (const char *s)
+{
+	if (output_recursion)
+		return;
+	output_recursion = 1;
+
+	int len = strlen (s);
+
+	if (len > 512)
+		len = 512;
+
+	nc_send_packet (s, len);
+
+	output_recursion = 0;
+}
+
+int nc_getc (void)
+{
+	input_recursion = 1;
+
+	net_timeout = 0;	/* no timeout */
+	while (!nc_buf)
+		NetLoop (NETCONS);
+
+	input_recursion = 0;
+
+	uchar tmp = nc_buf;
+
+	nc_buf = 0;
+	return tmp;
+}
+
+int nc_tstc (void)
+{
+	struct eth_device *eth;
+
+	if (input_recursion)
+		return 0;
+
+	if (nc_buf)
+		return 1;
+
+	eth = eth_get_dev ();
+	if (eth && eth->state == ETH_STATE_ACTIVE)
+		return 0;	/* inside net loop */
+
+	input_recursion = 1;
+
+	net_timeout = 1;
+	NetLoop (NETCONS);		/* kind of poll */
+
+	input_recursion = 0;
+
+	return nc_buf != 0;
+}
+
+int drv_nc_init (void)
+{
+	device_t dev;
+	int rc;
+
+	memset (&dev, 0, sizeof (dev));
+
+	strcpy (dev.name, "nc");
+	dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
+	dev.start = nc_start;
+	dev.putc = nc_putc;
+	dev.puts = nc_puts;
+	dev.getc = nc_getc;
+	dev.tstc = nc_tstc;
+
+	rc = device_register (&dev);
+
+	return (rc == 0) ? 1 : rc;
+}
+
+#endif	/* CONFIG_NETCONSOLE */

include/configs/TQM860L.h

@@ -97,6 +97,8 @@
 				CFG_CMD_IDE	| \
 				CFG_CMD_DATE	)
 
+#define CONFIG_NETCONSOLE
+
 /* this must be included AFTER the definition of CONFIG_COMMANDS (if any) */
 #include <cmd_confdefs.h>
 

include/devices.h

@@ -108,5 +108,8 @@ int	drv_keyboard_init (void);
 #ifdef CONFIG_USB_TTY
 int	drv_usbtty_init (void);
 #endif
+#ifdef CONFIG_NETCONSOLE
+int	drv_nc_init (void);
+#endif
 
 #endif	/* _DEVICES_H_ */

include/net.h

@@ -314,6 +314,7 @@ extern volatile uchar * NetRxPkt;		/* Current receive packet	*/
 extern int		NetRxPktLen;		/* Current rx packet length	*/
 extern unsigned		NetIPID;		/* IP ID (counting)		*/
 extern uchar		NetBcastAddr[6];	/* Ethernet boardcast address	*/
+extern uchar		NetEtherNullAddr[6];
 
 #define VLAN_NONE	4095			/* untagged 			*/
 #define VLAN_IDMASK	0x0fff			/* mask of valid vlan id 	*/
@@ -334,7 +335,7 @@ extern int		NetState;		/* Network loop state		*/
 extern int		NetRestartWrap;		/* Tried all network devices	*/
 #endif
 
-typedef enum { BOOTP, RARP, ARP, TFTP, DHCP, PING, DNS, NFS, CDP } proto_t;
+typedef enum { BOOTP, RARP, ARP, TFTP, DHCP, PING, DNS, NFS, CDP, NETCONS } proto_t;
 
 /* from net/net.c */
 extern char	BootFile[128];			/* Boot File name		*/

net/net.c

@@ -148,6 +148,11 @@ static void PingStart(void);
 static void CDPStart(void);
 #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			*/
@@ -308,6 +313,7 @@ restart:
 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 	case PING:
 #endif
+	case NETCONS:
 	case TFTP:
 		NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 		NetOurGatewayIP = getenv_IPaddr ("gatewayip");
@@ -319,6 +325,7 @@ restart:
 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 		case NFS:
 #endif
+		case NETCONS:
 		case TFTP:
 			NetServerIP = getenv_IPaddr ("serverip");
 			break;
@@ -403,6 +410,11 @@ restart:
 		case CDP:
 			CDPStart();
 			break;
+#endif
+#ifdef CONFIG_NETCONSOLE
+		case NETCONS:
+			NcStart();
+			break;
 #endif
 		default:
 			break;
@@ -1259,6 +1271,9 @@ NetReceive(volatile uchar * inpkt, int len)
 				/* 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);
@@ -1377,6 +1392,12 @@ NetReceive(volatile uchar * inpkt, int len)
 			return;
 		}
 
+#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.
 		 */
@@ -1406,6 +1427,7 @@ static int net_check_prereq (proto_t protocol)
 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 	case NFS:
 #endif
+	case NETCONS:
 	case TFTP:
 		if (NetServerIP == 0) {
 			puts ("*** ERROR: `serverip' not set\n");