.\" Copyright (c) 1980, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\" %sccs.include.redist.man%
.\" @(#)boot_tahoe.8 8.1 (Berkeley) %G%
system bootstrapping procedures
.Sy 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.
These are processor-type dependent.
Power 6/32 and related processors,
the system will do a standard autoboot from drive 0
This automatic boot may be cancelled by typing a
in the first few seconds after reset.
This enters console mode; the console prompt is
The boot flags can be set to any hexadecimal value
.Bd -filled -offset indent -compact
The default device may be examined or set; see the Diagnostics and Debugging
manual for the processor for details on device naming and syntax.
After setting the boot flags and/or device,
a bootstrap sequence can be initiated with
A specific device or bootstrap file may be used; for example,
would boot from the `a' partition on
The file specifications used for the boostrap
(register 23 set to 1 or 3)
.Dl device(adaptor,controller,unit,minor)
is the type of the device to be searched,
to which the device is attached,
is the unit number of the controller on that buss,
is the unit number of the disk or tape,
is the disk partition or tape file number.
Leading adaptor or controller numbers default to 0.
Normal line editing characters can be used when typing the file specification.
The following list of supported devices may vary from installation to
.Bd -unfilled -offset indent -compact
dk SMD or ESDI disks on VDDC or SMD-E
cy tape on Ciprico Tapemaster controller
to boot from a file system which starts at cylinder 0
In an emergency, the bootstrap methods described in the paper
.%T "Installing and Operating 4.3 BSD-tahoe UNIX on the Tahoe"
to boot from a distribution tape.
.Bl -tag -width /vmunix -compact
The disklabel format used by some versions of the console processor
is different than the format used by