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authorwdenk <wdenk>2004-08-02 21:11:11 +0000
committerwdenk <wdenk>2004-08-02 21:11:11 +0000
commit68ceb29e7133a0f972f53d3d61fd61207374baec (patch)
treeaea2bf247ffeabcab9e908c152b316e269e2e5ee /doc
parent9aea95307fdb0ffe0d3a98a17ac73e5040c9756a (diff)
Add support for console over UDP (compatible to Ingo Molnar's
netconsole patch under Linux)
Diffstat (limited to 'doc')
-rw-r--r--doc/README.NetConsole68
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diff --git a/doc/README.NetConsole b/doc/README.NetConsole
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+
+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