330 lines
7.1 KiB
Groff
330 lines
7.1 KiB
Groff
.\" Copyright (c) 2003 Hidetoshi Shimokawa
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.\"
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.Dd February 11, 2003
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.Dt DCONSCHAT 8
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.Os
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.Sh NAME
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.Nm dconschat
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.Nd user interface to
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.Xr dcons 4
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.Sh SYNOPSIS
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.Nm
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.Op Fl brvwRT1
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.Op Fl e Ar escape-char
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.Op Fl h Ar hz
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.Op Fl C Ar console_port
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.Op Fl G Ar gdb_port
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.Op Fl M Ar core
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.Op Fl N Ar system
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.Nm
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.Op Fl brvwR1
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.Op Fl h Ar hz
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.Op Fl C Ar console_port
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.Op Fl G Ar gdb_port
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.Op Fl a Ar address
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.Op Fl u Ar bus_num
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.Fl t Ar target_eui64
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.Sh DESCRIPTION
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The
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.Nm
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utility is designed to provide a way for users to access
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.Xr dcons 4
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(dumb console device) on a local or remote system.
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The
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.Nm
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utility interacts with
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.Xr dcons 4
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using
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.Xr kvm 3
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or
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.Xr firewire 4 ,
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and interacts with the user over TTY or TCP/IP.
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To access remote
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.Xr dcons 4
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using
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.Xr firewire 4 ,
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you have to specify target EUI64 address using the
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.Fl t
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option. Physical DMA should be enabled on the target machine for access
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via FireWire.
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.Pp
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The
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.Nm
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utility and the
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.Xr dcons 4
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driver communicate using 2 ports, one for the console port and another
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for remote
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.Xr gdb 1
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port.
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Users are supposed to access
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.Nm
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using TTY,
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.Xr telnet 1
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and
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.Xr gdb 1 .
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You can specify listen ports for console and
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.Xr gdb 1
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port using the
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.Fl C
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and
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.Fl G
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options respectively.
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The port number 0 has special meaning that
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current TTY (stdin/stdout) is used instead of TCP/IP.
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A negative port number will disable the port.
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By analogy with
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.Xr pty 4
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device, the
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.Xr dcons 4
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acts as a slave device and
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.Nm
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acts as a master device with
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.Xr telnetd 8 .
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.Pp
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Typed characters are normally transmitted directly to
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.Xr dcons 4 .
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A escape character (the default is
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.Ql ~
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) appearing as the first character of a line is an escape signal; the
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following are recognized:
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.Bl -tag -width ident
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.It Ic ~.
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Drop the connection and exit.
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.It Ic ~^G
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Invoke kgdb on the terminal on which dconschat is running.
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.It Ic ~^R
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Reset the target over FireWire if a reset address is registered in Configuration ROM.
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.It Ic ~^Z
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Suspend the dconschat process.
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.El
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.Pp
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The following options are supported.
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.Bl -tag -width indent
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.It Fl b
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Translate Ctrl-C to ALT_BREAK (CR +
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.Ql ~
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+ Ctrl-B) on
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.Xr gdb 1
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port.
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.It Fl r
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Replay old buffer on connection.
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.It Fl v
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Verbose debug output.
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Multiple
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.Fl v
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options increase verbosity.
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.It Fl w
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Listen on a wildcard address rather than localhost.
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.It Fl R
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Read-only.
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Do not write anything to the
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.Xr dcons 4
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buffer.
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.It Fl T
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Enable ad-hoc workaround for the TELNET protocol to
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remove unnecessary byte sequences.
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It should be set when you access
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.Nm
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using
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.Xr telnet 1 .
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.It Fl 1
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One-shot.
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Read available buffer, then exit.
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This implies the
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.Fl r
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option.
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.It Fl e Ar escape-char
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Specify escape character.
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The default is '~'.
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.It Fl h Ar hz
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Specify polling rate.
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The default value is 100.
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.It Fl C Ar console_port
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Specify the console port.
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The default value is 0 (stdin/stdout).
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.It Fl G Ar gdb_port
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Specify
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.Xr gdb 1
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port.
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The default value is \-1 (disabled).
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.It Fl M Ar core
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Specify core file.
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.It Fl N Ar system
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Specify system file such as
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.Pa /boot/kernel/kernel .
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.It Fl t Ar target_eui64
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Specify the 64-bit extended unique identifier of the target,
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and use FireWire to access remote
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.Xr dcons 4 .
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.It Fl a Ar address
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Specify the physical I/O address of the
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.Xr dcons 4
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buffer.
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See
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.Xr dcons 4
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for details.
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If this option is not specified,
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.Nm
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tries to get the address from the Configuration ROM on the target.
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You are supposed to enable
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.Xr dcons_crom 4
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on the target to omit this option.
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.It Fl u Ar bus_num
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Specify FireWire bus number.
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The default is 0.
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.El
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.Sh FILES
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.Bl -tag -width indent -compact
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.It Pa /dev/fwmem0.0
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.It Pa /dev/mem
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.It Pa /dev/kmem
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.El
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.Sh EXAMPLES
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To use
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.Nm
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with FireWire for remote
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.Xr dcons 4 ,
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you have to specify the EUI64 of the target.
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You can obtain EUI64 by running
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.Xr fwcontrol 8
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without options.
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The first EUI64 is of the host running
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.Xr fwcontrol 8
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and others on the bus follow.
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.Bd -literal -offset indent
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# fwcontrol
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2 devices (info_len=2)
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node EUI64 status
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1 77-66-55-44-33-22-11-00 0
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0 00-11-22-33-44-55-66-77 1
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.Ed
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.Pp
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The EUI64 does not change unless you change the hardware
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as the ethernet address.
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.Pp
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Now we can run
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.Nm .
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.Bd -literal -offset indent
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# dconschat -br -G 12345 -t 00-11-22-33-44-55-66-77
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.Ed
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.Pp
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You will get console output of the target and login prompt if a
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.Xr getty 8
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is running on
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.Xr dcons 4 .
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You can break to DDB with ALT_BREAK (CR +
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.Ql ~
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+ Ctrl-B)
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if
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.Dv DDB
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and
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.Dv ALT_BREAK_TO_DEBUGGER
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are enabled in the target kernel.
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To quit the session, type CR +
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.Ql ~
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+
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.Ql \&.
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in the console port.
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.Pp
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Using
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.Xr gdb 1
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port is almost the same as remote
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.Xr gdb 1
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over serial line except
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using TCP/IP instead of
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.Pa /dev/cu* .
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See
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.Sx "On-line Kernel Debugging Using Remote GDB"
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section of
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.%T "The FreeBSD Developers Handbook"
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and
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.Xr gdb 4
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for details.
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.Bd -literal -offset indent
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% gdb -k kernel.debug
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(kgdb) target remote :12345
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.Ed
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.Pp
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Once
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.Xr gdb 1
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is attached and you specified the
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.Fl b
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option to
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.Nm ,
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typing Ctrl-C in
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.Xr gdb 1
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causes a break to debugger.
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.Pp
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The following command gets the console log from the crash dump:
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.Bd -literal -offset indent
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# dconschat -1 -M vmcore.0 -N kernel.0
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.Ed
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.Pp
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If you want access to the console using
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.Xr telnet 1 ,
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try the following:
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.Bd -literal -offset indent
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# dconschat -rTC 5555 &
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# telnet localhost 5555
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.Ed
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.Pp
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You may want to keep logging console output of several machines.
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.Nm conserver-com
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in the Ports collection may help you.
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Insert the following lines in
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.Pa conserver.cf :
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.Bd -literal -offset indent
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console local {
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master localhost;
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type exec;
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exec /usr/sbin/dconschat -rh 25;
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}
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console remote {
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master localhost;
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type exec;
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exec /usr/sbin/dconschat -rh 25 -t 00-11-22-33-44-55-66-77;
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}
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.Ed
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.Sh SEE ALSO
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.Xr gdb 1 ,
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.Xr telnet 1 ,
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.Xr kvm 3 ,
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.Xr dcons 4 ,
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.Xr dcons_crom 4 ,
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.Xr ddb 4 ,
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.Xr firewire 4 ,
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.Xr fwohci 4 ,
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.Xr gdb 4 ,
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.Xr eui64 5 ,
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.Xr fwcontrol 8
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.Sh AUTHORS
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.An Hidetoshi Shimokawa Aq simokawa@FreeBSD.org
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.Sh BUGS
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This utility is
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.Ud
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