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\"     @(#)boot_sparc.8 8.2 (Berkeley) 4/19/94
\"
Dd April 29, 2003
Dt BOOT 8 sun2
Os
Sh NAME
Nm boot
Nd system bootstrapping procedures
Sh SYNOPSIS
Nm b
Oo
Ar dev
Oo Pq Ar cntrl , unit , part
Oc
Oc
Op Ar file
Op Fl adqsv
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
as described in
Xr fsck 8 ,
and unless this fails, the system will resume multi-user operations.
Ss Selecting the device and kernel to boot
Normally, the
Nm b
command alone is sufficient to boot the system, as the PROM chooses
a default boot device
Ar dev
if none is specified.
The PROM chooses the first device present on
the system from the following ordered list:
Pp
Bd -unfilled -offset indent -compact
sd      SCSI disk
ie      Intel Ethernet
ec      3Com Ethernet
Ed
Pp
Unless specified, the controller number
Ar cntrl ,
unit number
Ar unit ,
and partition number
Ar part
default to zero, which is almost always correct.
Pp
The controller number can
be specified if there is more than one of the given device in the system.
For example, use
Dq ie(1,,)
to boot off of the second Intel Ethernet in the system.
Pp
The unit number specifies one of the many devices attached to a
controller.
The exact meaning and values vary depending on the device name.
For example,
Dq sd(,18,)
boots the disk at target 6 on the first SCSI controller, 18 being the target
number 6, multiplied by 4, and given in hexadecimal.
Pp
The partition number specifies one of the many partitions on a device.
The exact meaning and values vary depending on the device name.
For example,
Dq sd(,18,1)
boots the second partition on the disk at target 6 on the first SCSI
controller.
Pp
The PROM only loads a first-stage boot program, currently either
Pa /usr/mdec/bootxx
(for a disk boot), or
Pa /usr/mdec/bootyy
(for a network boot).
This first-stage boot program then loads the
second-stage boot program from the same device, currently either
Pa /usr/mdec/ufsboot
(for a disk boot), or
Pa /usr/mdec/netboot
(for a network boot).
Pp
The second-stage boot program will then attempt to load the kernel named
Ar file
(or
Pa vmunix
if none is specified).
The second-stage disk boot program
Pa /usr/mdec/ufsboot
loads the kernel from the same device that it was loaded from,
while the second-stage network boot program
Pa /usr/mdec/netboot
will load the kernel
from the NFS root as determined by the procedure described in
Xr diskless 8 .
Ss Boot program options
Bl -tag -width xxx
It Fl a
Prompt for the root file system device, the system crash dump
device, and the path to
Xr init 8 .
It Fl d
Bring the system up in debug mode.
Here it waits for a kernel debugger connect; see
Xr ddb 4 .
It Fl q
Boot the system in quiet mode.
It Fl s
Bring the system up in single-user mode.
It Fl v
Boot the system in verbose mode.
El
Pp
Other flags are currently ignored.
Pp
At any time you can break back to the ROM by pressing the
Sq L1
and
Sq a
keys at the same time (if the console is a serial port the same is
achieved by sending a
Sq break ) .
If you do this accidentally you can continue whatever was in progress
by typing
Sq c
followed by the return key.
Sh FILES
Bl -tag -width /usr/mdec/installbootXX -compact
It Pa /netbsd
system code
It Pa /usr/mdec/bootxx
first-level boot block for disks
It Pa /usr/mdec/bootyy
first-level boot block for NFS (diskless) boot
It Pa /usr/mdec/netboot
boot program for NFS (diskless) boot
It Pa /usr/mdec/ufsboot
second-level boot program for UFS disks
It Pa /usr/sbin/installboot
program to install bootxx on a disk
El
Sh SEE ALSO
Xr crash 8 ,
Xr disklabel 8 ,
Xr fsck 8 ,
Xr halt 8 ,
Xr init 8 ,
Xr rc 8 ,
Xr shutdown 8 ,
Xr syslogd 8

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