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$FreeBSD: head/usr.sbin/dconschat/dconschat.8 121468 2003-10-24 15:44:10Z simokawa $
.Dd February 11, 2003 .Dt DCONSCHAT 8 .Os .Sh NAME .Nm dconschat .Nd user interface to dcons .Sh SYNOPSIS .Nm .Op Fl brvwRT1 .Op Fl h Ar hz .Op Fl C Ar console_port .Op Fl G Ar gdb_port .Op Fl M Ar core .Op Fl N Ar system .Nm .Op Fl brvwR1 .Op Fl h Ar hz .Op Fl C Ar console_port .Op Fl G Ar gdb_port .Op Fl a Ar address .Op Fl u Ar bus_num .Fl t Ar target_eui64 .Sh DESCRIPTION The .Nm utility is designed to provide a way for users to access .Xr dcons 4 (dumb console device) on a local or remote system. The .Nm interacts with .Xr dcons 4 using .Xr kvm 3 or .Xr firewire 4 and interact with a user over tty or TCP/IP. To access remote .Xr dcons 4 using .Xr firewire 4 , you have to specify target EUI64 address by .Fl t option.
p The .Nm and .Xr dcons 4 communicate using 2 port, one for console port and the other for remote gdb port. Users are supposed to access .Nm using tty, telnet and gdb. You can specify listen ports for console and gdb port by .Fl C and .Fl G options respectively. The port number 0 has special meaning that current tty(stdin/out) is used instead of TCP/IP. A negative port number will disable the port. To quit dconschat, send a CR + '~' + '.' sequence to the console port or send signal to the process.
p By analogy with .Xr pty 4 device, the .Xr dcons 4 acts as a slave device and .Nm acts as a master device with .Xr telnetd 8 .
p l -tag -width indent t Fl b Translate Ctrl-C to ALT_BREAK(CR + '~' + Ctrl-B) on gdb port. t Fl r Replay old buffer on connection. t Fl v Verbose debug output. Multiple '-v' increase verbosity. t Fl w Listen on wildcard address rather than localhost. t Fl R Read-only. Don't write anything on dcons buffer. t Fl T Enable ad hoc workaround for telnet protocol to remove unnecessary byte sequences. It should be set when you access dconschat using telnet. t Fl 1 One-Shot. Read available buffer then exit. This implies .Fl r option. t Fl h Ar hz Specify polling rate. The default value is 100. t Fl C Ar console_port Specify console port. The default value is 0(stdin/stdout). t Fl G Ar gdb_port Specify gdb port.. The default value is -1(disabled). t Fl M Ar core Specify core file. t Fl N Ar system Specify system file such as /boot/kernel/kernel. t Fl t Ar target_eui64 Specify the 64bit extended unique identifier of the target and use FireWire to access remote .Xr dcons 4 . t Fl a Ar address Specify the physical/IO address of the dcons buffer. See .Xr dcons 4 for details. If this option is not specified, .Nm tries to get the address from the Configuration ROM on the target. You are supposed to enable .Xr dcons_crom 4 on the target to omit this option. t Fl u Ar bus_num Specify FireWire bus number. The default is 0. .El .Sh EXAMPLE To use .Nm with FireWire for remote .Xr dcons , you have to specify the eui64 of the target. You can obtain EUI64 by running .Xr fwcontorl 4 without options. The first EUI64 is of the host running fwcontrol and others on the bus follow. d -literal -offset indent # fwcontrol 2 devices (info_len=2) node EUI64 status 1 0x7766554433221100 0 0 0x0011223344556677 1 .Ed
p The EUI64 doesn't change unless you change the hardware as the ethernet address.
p Now we can run the .Nm . d -literal -offset indent # dconschat -br -G 12345 -t 0x00112233445566677 .Ed
p You'll get console output of the target and login prompt if a getty is running on dcons. You can break to DDB with ALT_BREAK (CR + '~' + Ctrl-B) if DDB and ALT_BREAK_TO_DEBUGGER is enabled in the target kernel. To quit the session, type CR + '~' + '.' in the console port.
p Using gdb port is almost the same as remote gdb over serial line except using TCP/IP instead of /dev/cu*. See "On-line Kernel Debugging Using Remote GDB" section of The FreeBSD Developers Handbook. d -literal -offset indent % gdb -k kernel.debug (kgdb) target remote :12345 .Ed
p Once gdb is attached and you specified '-b' option to dconschat, typing "Ctrl-C" on gdb causes break to debugger.
p The following command get console log from crash dump: d -literal -offset indent # dconschat -1 -M vmcore.0 -N kernel.0 .Ed
p If you want access to the console using telnet, try the following: d -literal -offset indent # dconschat -rTC 5555 & # telnet localhost 5555 .Ed
p You may want to keep logging console output of several machines. Conserve-com in the ports collection should help you. Insert the following lines in the conserver.cf d -literal -offset indent local:|/usr/sbin/dconschat -rh 25::&: remote:|/usr/sbin/dconschat -rh 25 -t 0x00112233445566677::&: .Ed .Sh FILES l -tag -width indent t Pa /dev/fwmem0.0 t Pa /dev/mem t Pa /dev/kmem .El .Sh SEE ALSO .Xr gdb 1 , .Xr telnet 1 , .Xr kvm 3 , .Xr dcons 4 , .Xr dcons_crom 4 , .Xr ddb 4 , .Xr firewire 4 , .Xr fwohci 4 , .Xr fwcontrol 8 .Sh AUTHORS .An Hidetoshi Shimokawa Aq simokawa@FreeBSD.org .Sh BUGS This utility is still under development.
p