1*68ceb29eSwdenk 2*68ceb29eSwdenkIn U-Boot, we implemented the networked console via the standard 3*68ceb29eSwdenk"devices" mechanism, which means that you can switch between the 4*68ceb29eSwdenkserial and network input/output devices by adjusting the 'stdin' and 5*68ceb29eSwdenk'stdout' environment variables. To switch to the networked console, 6*68ceb29eSwdenkset either of these variables to "nc". Input and output can be 7*68ceb29eSwdenkswitched independently. 8*68ceb29eSwdenk 9*68ceb29eSwdenkOn the host side, please use this script to access the console: 10*68ceb29eSwdenk 11*68ceb29eSwdenk+++++++++++++++++++++++++++++++++++++++++++ 12*68ceb29eSwdenk#! /bin/bash 13*68ceb29eSwdenk 14*68ceb29eSwdenkTARGET_IP=$1 15*68ceb29eSwdenk 16*68ceb29eSwdenkstty -icanon -echo intr ^T 17*68ceb29eSwdenknc -u -l -p 6666 < /dev/null & 18*68ceb29eSwdenknc -u ${TARGET_IP} 6666 19*68ceb29eSwdenkstty icanon echo intr ^C 20*68ceb29eSwdenk+++++++++++++++++++++++++++++++++++++++++++ 21*68ceb29eSwdenk 22*68ceb29eSwdenkFor Linux, the network-based console needs special configuration. 23*68ceb29eSwdenkMinimally, the host IP address needs to be specified. This can be 24*68ceb29eSwdenkdone either via the kernel command line, or by passing parameters 25*68ceb29eSwdenkwhile loading the netconsole.o module (when used in a loadable module 26*68ceb29eSwdenkconfiguration). Please refer to Documentation/networking/logging.txt 27*68ceb29eSwdenkfile for the original Ingo Molnar's documentation on how to pass 28*68ceb29eSwdenkparameters to the loadable module. 29*68ceb29eSwdenk 30*68ceb29eSwdenkThe format of the kernel command line parameter (for the static 31*68ceb29eSwdenkconfiguration) is as follows: 32*68ceb29eSwdenk 33*68ceb29eSwdenk netconsole=[src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr] 34*68ceb29eSwdenk 35*68ceb29eSwdenkwhere 36*68ceb29eSwdenk 37*68ceb29eSwdenk src-port source for UDP packets 38*68ceb29eSwdenk (defaults to 6665) 39*68ceb29eSwdenk src-ip source IP to use 40*68ceb29eSwdenk (defaults to the interface's address) 41*68ceb29eSwdenk dev network interface 42*68ceb29eSwdenk (defaults to eth0) 43*68ceb29eSwdenk tgt-port port for logging agent 44*68ceb29eSwdenk (defaults to 6666) 45*68ceb29eSwdenk tgt-ip IP address for logging agent 46*68ceb29eSwdenk (this is the required parameter) 47*68ceb29eSwdenk tgt-macaddr ethernet MAC address for logging agent 48*68ceb29eSwdenk (defaults to broadcast) 49*68ceb29eSwdenk 50*68ceb29eSwdenkExamples: 51*68ceb29eSwdenk 52*68ceb29eSwdenk netconsole=4444@10.0.0.1/eth1,9353@10.0.0.2/12:34:56:78:9a:bc 53*68ceb29eSwdenk 54*68ceb29eSwdenkor 55*68ceb29eSwdenk 56*68ceb29eSwdenk netconsole=@/,@192.168.3.1/ 57*68ceb29eSwdenk 58*68ceb29eSwdenkPlease note that for the Linux networked console to work, the 59*68ceb29eSwdenkethernet interface has to be up by the time the netconsole driver is 60*68ceb29eSwdenkinitialized. This means that in case of static kernel configuration, 61*68ceb29eSwdenkthe respective Ethernet interface has to be brought up using the "IP 62*68ceb29eSwdenkAutoconfiguration" kernel feature, which is usually done by defaults 63*68ceb29eSwdenkin the ELDK-NFS-based environment. 64*68ceb29eSwdenk 65*68ceb29eSwdenkTo browse the Linux network console output, use the 'netcat' tool invoked 66*68ceb29eSwdenkas follows: 67*68ceb29eSwdenk 68*68ceb29eSwdenk nc -u -l -p 6666 69