mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
1cd300de5e
Also conditionally add ncb.o to OBJ_FILES list Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
110 lines
3.8 KiB
Text
110 lines
3.8 KiB
Text
|
|
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.
|
|
|
|
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
|
|
./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 be built
|
|
when compiling for a board which has CONFIG_NETCONSOLE defined.
|
|
|
|
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
|
|
|
|
Note that unlike the U-Boot implementation the Linux netconsole is
|
|
unidirectional, i. e. you have console output only in Linux.
|