set either of these variables to "nc". Input and output can be
switched independently.
+We use an environment variable 'ncip' to set the IP address and the
+port of the destination. The format is <ip_addr>:<port>. If <port> is
+omitted, the value of 6666 is used. If the env var doesn't exist, the
+broadcast address and port 6666 are used. If it is set to an IP
+address of 0 (or 0.0.0.0) then no messages are sent to the network.
+
+For example, if your server IP is 192.168.1.1, you could use:
+
+ => setenv nc 'setenv stdout nc;setenv stdin nc'
+ => setenv ncip 192.168.1.1
+ => saveenv
+ => run nc
+
+
On the host side, please use this script to access the console:
+ tools/netconsole <ip> [port]
+
+The script uses netcat to talk to the board over UDP. It requires you to
+specify the target IP address (or host name, assuming DNS is working). The
+script can be interrupted by pressing ^T (CTRL-T).
+
+Be aware that in some distributives (Fedora Core 5 at least)
+usage of nc has been changed and -l and -p options are considered
+as mutually exclusive. If nc complains about options provided,
+you can just remove the -p option from the script.
+
+It turns out that 'netcat' cannot be used to listen to broadcast
+packets. We developed our own tool 'ncb' (see tools directory) that
+listens to broadcast packets on a given port and dumps them to the
+standard output. use it as follows:
+
+++++++++++++++++++++++++++++++++++++++++++
#! /bin/bash
+[ $# = 1 ] || { echo "Usage: $0 target_ip" >&2 ; exit 1 ; }
TARGET_IP=$1
-stty -icanon -echo intr ^T
-nc -u -l -p 6666 < /dev/null &
+stty icanon echo intr ^T
+./ncb &
nc -u ${TARGET_IP} 6666
stty icanon echo intr ^C
+kill 0
+++++++++++++++++++++++++++++++++++++++++++
+Again, this script takes exactly one argument, which is interpreted
+as the target IP address (or host name, assuming DNS is working). The
+script can be interrupted by pressing ^T (CTRL-T).
+
+The 'ncb' tool can be found in the tools directory; it will not be
+built by default so you will ither have to adjust the Makefile or
+build it manually.
+
+
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
as follows:
nc -u -l -p 6666
+
+Note that unlike the U-Boot implementation the Linux netconsole is
+unidirectional, i. e. you have console output only in Linux.
projects / oweals / u-boot.git / blobdiff