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130 lines
4.7 KiB
Groff
130 lines
4.7 KiB
Groff
.\" $NetBSD: boot.8,v 1.10 2009/09/05 11:37:52 wiz Exp $
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.\"
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.\" Copyright (c) 1990, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Systems Programming Group of the University of Utah Computer
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.\" Science Department.
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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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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR 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, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" From:
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.\" @(#)boot_hp300.8 8.2 (Berkeley) 4/19/94
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.\"
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.Dd July 1, 1995
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.Dt BOOT 8 mac68k
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.Os
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.Sh NAME
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.Nm boot
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.Nd
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system bootstrapping procedures
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.Sh DESCRIPTION
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.Ss Power fail and crash recovery
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Normally, the
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.Nx
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kernel on the mac68k architecture is booted from the native operating
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system by means of an application program.
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When the kernel takes over,
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it initializes itself and proceeds to boot the system.
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An automatic consistency check of the file systems takes place,
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and unless this fails, the system comes up to multi-user operations.
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The proper way to shut the system down is with the
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.Xr shutdown 8
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command.
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.Pp
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If the system crashes, it will enter the kernel debugger,
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.Xr ddb 4 ,
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if it is configured in the kernel.
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If the debugger is not present,
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or the debugger is exited, the system will attempt a dump to the
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configured dump device (which will be automatically recovered with
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.Xr savecore 8
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during the next boot cycle).
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After the dump is complete (successful
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or not), the system will attempt a reboot.
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.Pp
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On most mac68k machines with "soft-power" after the IIcx, the power
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switch can be physically rotated and locked in the 'on' position.
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The native OS can be configured to automatically start the
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.Nx
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boot program.
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Additionally, the
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.Nx
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boot program can be configured to boot
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.Nx
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without intervention.
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When a system is so configured, it can crash or lose power and
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reboot back to a fully multi-user state without any intervention.
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.Pp
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.Ss The boot application
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The boot application runs in the native OS on the system.
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It has a dialog where booting preferences may be changed and an
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option whereby these options may be saved.
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The preferences are stored in the program
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itself, not in a preferences folder--thus allowing two separate copies
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of the program to be configured differently (e.g. to boot different
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netbsd or netbsd.test, or to boot from two different drives).
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.Pp
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One option that may be specified is a boot to single-user mode.
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This stops the boot process very early on and allows system maintenance.
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If one wishes to provide some security at this phase of the boot, remove
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the
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.Ql secure
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option from ttye0 in the
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.Xr ttys 5
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file.
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.Pp
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Another useful option that may be specified is the "serial console"
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option.
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This will allow a serial device (terminal or computer) to
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act as a console for the system.
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This device must be configured to
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use 9600 baud, eight bits, no parity, and one stop bit (9600-N81).
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Either the printer port or the modem port (tty01 and tty00,
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respectively) may be used for this.
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.Pp
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It is sometimes useful to boot a kernel that resides in a folder
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in native OS rather than from the usual location in the
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.Nx
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file system.
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A radio button is supplied for this purpose.
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Note that
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some programs will not run properly if the kernel is not found as
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.Ar /netbsd
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within the
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.Nx
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file system.
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.Sh FILES
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.Bl -tag -width /netbsd -compact
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.It Pa /netbsd
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system kernel
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.El
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.Sh SEE ALSO
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.Xr ddb 4 ,
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.Xr ttys 5 ,
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.Xr savecore 8 ,
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.Xr shutdown 8
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