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|
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In U-Boot, we implemented the networked console via the standard |
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"devices" mechanism, which means that you can switch between the |
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serial and network input/output devices by adjusting the 'stdin' and |
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'stdout' environment variables. To switch to the networked console, |
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set either of these variables to "nc". Input and output can be |
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switched independently. |
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|
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On the host side, please use this script to access the console: |
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+++++++++++++++++++++++++++++++++++++++++++ |
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#! /bin/bash |
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TARGET_IP=$1 |
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stty -icanon -echo intr ^T |
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nc -u -l -p 6666 < /dev/null & |
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nc -u ${TARGET_IP} 6666 |
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stty icanon echo intr ^C |
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+++++++++++++++++++++++++++++++++++++++++++ |
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|
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For Linux, the network-based console needs special configuration. |
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Minimally, the host IP address needs to be specified. This can be |
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done either via the kernel command line, or by passing parameters |
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while loading the netconsole.o module (when used in a loadable module |
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configuration). Please refer to Documentation/networking/logging.txt |
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file for the original Ingo Molnar's documentation on how to pass |
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parameters to the loadable module. |
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|
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The format of the kernel command line parameter (for the static |
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configuration) is as follows: |
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netconsole=[src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr] |
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where |
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src-port source for UDP packets |
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(defaults to 6665) |
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src-ip source IP to use |
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(defaults to the interface's address) |
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dev network interface |
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(defaults to eth0) |
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tgt-port port for logging agent |
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(defaults to 6666) |
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tgt-ip IP address for logging agent |
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(this is the required parameter) |
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tgt-macaddr ethernet MAC address for logging agent |
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(defaults to broadcast) |
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|
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Examples: |
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netconsole=4444@10.0.0.1/eth1,9353@10.0.0.2/12:34:56:78:9a:bc |
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or |
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netconsole=@/,@192.168.3.1/ |
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Please note that for the Linux networked console to work, the |
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ethernet interface has to be up by the time the netconsole driver is |
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initialized. This means that in case of static kernel configuration, |
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the respective Ethernet interface has to be brought up using the "IP |
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Autoconfiguration" kernel feature, which is usually done by defaults |
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in the ELDK-NFS-based environment. |
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To browse the Linux network console output, use the 'netcat' tool invoked |
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as follows: |
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nc -u -l -p 6666 |
@ -0,0 +1,204 @@ |
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/*
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* (C) Copyright 2004 |
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#include <common.h> |
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#ifdef CONFIG_NETCONSOLE |
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#include <command.h> |
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#include <devices.h> |
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#include <net.h> |
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#ifndef CONFIG_NET_MULTI |
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#error define CONFIG_NET_MULTI to use netconsole |
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#endif |
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static uchar nc_buf = 0; /* input buffer */ |
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static int input_recursion = 0; |
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static int output_recursion = 0; |
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static int net_timeout; |
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|
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static void nc_wait_arp_handler (uchar * pkt, unsigned dest, unsigned src, |
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unsigned len) |
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{ |
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NetState = NETLOOP_SUCCESS; /* got arp reply - quit net loop */ |
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} |
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static void nc_handler (uchar * pkt, unsigned dest, unsigned src, |
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unsigned len) |
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{ |
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if (nc_buf) |
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NetState = NETLOOP_SUCCESS; /* got input - quit net loop */ |
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} |
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static void nc_timeout (void) |
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{ |
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NetState = NETLOOP_SUCCESS; |
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} |
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void NcStart (void) |
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{ |
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if (memcmp (NetServerEther, NetEtherNullAddr, 6)) { |
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/* going to check for input packet */ |
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NetSetHandler (nc_handler); |
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NetSetTimeout (net_timeout, nc_timeout); |
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} else { |
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/* send arp request */ |
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NetSetHandler (nc_wait_arp_handler); |
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NetSendUDPPacket (NetServerEther, NetServerIP, 6665, 6666, 0); |
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} |
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} |
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int nc_input_packet (uchar * pkt, unsigned dest, unsigned src, unsigned len) |
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{ |
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if (dest != 6666 || !len) |
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return 0; /* not for us */ |
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nc_buf = *pkt; |
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return 1; |
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} |
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static void nc_send_packet (const char *buf, int len) |
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{ |
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DECLARE_GLOBAL_DATA_PTR; |
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struct eth_device *eth; |
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int inited = 0; |
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uchar *pkt; |
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if (!memcmp (NetServerEther, NetEtherNullAddr, 6)) |
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return; |
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if ((eth = eth_get_dev ()) == NULL) { |
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return; |
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} |
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if (eth->state != ETH_STATE_ACTIVE) { |
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if (eth_init (gd->bd) < 0) |
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return; |
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inited = 1; |
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} |
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pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE; |
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memcpy (pkt, buf, len); |
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NetSendUDPPacket (NetServerEther, NetServerIP, 6666, 6665, len); |
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if (inited) |
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eth_halt (); |
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} |
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int nc_start (void) |
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{ |
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if (memcmp (NetServerEther, NetEtherNullAddr, 6)) |
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return 0; |
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return NetLoop (NETCONS); /* wait for arp reply */ |
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} |
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void nc_putc (char c) |
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{ |
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if (output_recursion) |
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return; |
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output_recursion = 1; |
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nc_send_packet (&c, 1); |
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output_recursion = 0; |
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} |
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void nc_puts (const char *s) |
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{ |
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if (output_recursion) |
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return; |
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output_recursion = 1; |
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int len = strlen (s); |
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if (len > 512) |
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len = 512; |
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nc_send_packet (s, len); |
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output_recursion = 0; |
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} |
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int nc_getc (void) |
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{ |
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input_recursion = 1; |
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net_timeout = 0; /* no timeout */ |
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while (!nc_buf) |
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NetLoop (NETCONS); |
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input_recursion = 0; |
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uchar tmp = nc_buf; |
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nc_buf = 0; |
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return tmp; |
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} |
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int nc_tstc (void) |
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{ |
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struct eth_device *eth; |
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if (input_recursion) |
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return 0; |
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if (nc_buf) |
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return 1; |
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eth = eth_get_dev (); |
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if (eth && eth->state == ETH_STATE_ACTIVE) |
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return 0; /* inside net loop */ |
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input_recursion = 1; |
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net_timeout = 1; |
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NetLoop (NETCONS); /* kind of poll */ |
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input_recursion = 0; |
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return nc_buf != 0; |
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} |
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int drv_nc_init (void) |
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{ |
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device_t dev; |
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int rc; |
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memset (&dev, 0, sizeof (dev)); |
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strcpy (dev.name, "nc"); |
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dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM; |
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dev.start = nc_start; |
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dev.putc = nc_putc; |
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dev.puts = nc_puts; |
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dev.getc = nc_getc; |
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dev.tstc = nc_tstc; |
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rc = device_register (&dev); |
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return (rc == 0) ? 1 : rc; |
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} |
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#endif /* CONFIG_NETCONSOLE */ |
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