.\"	$OpenBSD: boot_x68k.8,v 1.6 1998/11/11 22:20:00 aaron Exp $
.\"	$NetBSD: boot_x68k.8,v 1.1 1996/06/15 18:54:22 oki Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    notice, this list of conditions and the following disclaimer in the
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.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\"	@(#)boot_x68k.8	8.2 (Berkeley) 4/19/94
.\"
.Dd June 16, 1996
.Dt BOOT_X68K 8 x68k
.Os
.Sh NAME
.Nm boot
.Nd
system bootstrapping procedures
.Sh DESCRIPTION
.Ss Power fail and crash recovery
Normally, the system will reboot itself at power-up or after crashes.
An automatic consistency check of the file systems will be performed,
and unless this fails, the system will resume multi-user operations.
.Pp
.Ss Cold starts
The X68000/X68030 system boots from the device
which is determined by the configuration of
battery-backuped SRAM.
By default, the boot ROM attempts to boot from a
floppy disk drive (from 0 to 3) first,
and then from a hard disk (SASI or SCSI).
On the OpenBSD/X68k, booting from partition
.Dq a
of SCSI disks (sd?a) 
and 2HD floppy disks (fd?a, fd?c) is currently supported.
.Pp
First, the initial program loader of IOCS ROM or SCSI disk
(or equivalent) reads the
.Nm boot
program at the top of the disk,
and then the
.Nm boot
program loads the OpenBSD kernel
.Pa /bsd
which is in the same partition of the disk.
If you press the
.Sq SHIFT
key when booting, the boot program enables you to change the
boot flag
.Dv RB_SINGLE
with the
.Sq SHIFT
key, and to choose which kernel
to be used with arrow keys.
If the LED of the
.Sq HIRAGANA
key is turned on, the boot program adds the
.Dv RB_KDB
flag and tries to boot the system in debug mode; see
.Xr ddb 8
for details.
.Pp
Note for X68030+MC68030 systems:
Nothing special to be attended to; you can boot OpenBSD just like as
other operating systems such as Human68k and OS-9.
.Pp
Note for X68030/040turbo(68040 accelerator by BEEPs) systems:
OpenBSD can boot under 040 mode.
It can also boot under 030 mode if you have an MC68030 on the board.
.Pp
Note for X68000/Xellent30(68030 accelerator by TSR) + MC68030 systems:
In order to boot OpenBSD, you must choose 030 mode by using
.Pa CH30.SYS ,
which must reside in the battery-backuped SRAM.
.Pp
Note for X68000/Jupiter-X(68040/060 accelerator by FTZ-net) systems:
The system must be in 040/060 processor mode.
.Sh FILES
.Bl -tag -width /usr/mdec/xxbootxx -compact
.It Pa /bsd
system code
.It Pa /usr/mdec/xxboot
boot program, xx is disk type
.El
.Sh SEE ALSO
.Xr reboot 2 ,
.Xr disklabel 8 ,
.Xr halt 8 ,
.Xr reboot 8 ,
.Xr shutdown 8