boot,
boot.conf —
hppa-specific bootstrap
The main purpose of this program is to load the system kernel while dealing with
the various features of the PA-RISC hardware.
As described in
boot_hppa(8),
this program is loaded by the PDC firmware and provides a convenient way to
load the kernel.
Basic operations include:
- Loading kernels from any device supported by your system.
- Loading kernels compressed by
gzip(1).
- Providing an interactive command line.
- Detecting and switching between multiple consoles.
The sequence of its operation is as follows: initialization, parsing the
configuration file, then an interactive command line. While at the command
line you have 5 seconds to type any commands, if needed. If time expires, the
kernel will be loaded according to the current variable settings (see the
set command). Each time a kernel load
fails, the timeout is increased by one second. The sequence of
boot operations is as follows:
- If the file /etc/boot.conf exists on
the filesystem or LIF image
boot was
loaded from, open and parse it. Lines beginning with the ‘#’
character, as well as whitespace at the beginning of lines, are ignored.
The file may contain any commands boot
accepts at the interactive prompt. Though default settings usually
suffice, they can be changed here.
- The header line
>> OpenBSD/hppa BOOT
[x.xx]
is displayed to the active console, where
x.xx is the version number of the
boot program, followed by the
boot>
prompt, which means you are in interactive mode and may enter commands. If
you do not, boot will proceed to load
the kernel with the current parameters after the timeout period has
expired.
By default,
boot attempts to load the kernel
executable
/bsd. If it fails to find the
kernel and no alternative kernel image has been specified, the system will be
unable to boot.
The following commands are accepted at the
boot prompt:
-
-
- boot
[]
[
-acds
]
- Boots the specified kernel image with any options given. If
device or
image are omitted, values from
boot variables will be used.
-
-
-a- Causes the kernel to ask for the
root device to use.
-
-
-c- Causes the kernel to go into
boot_config(8)
before performing
autoconf(4)
procedures.
-
-
-d- Causes the kernel to drop into
ddb(4) at the
earliest convenient point.
-
-
-s- Causes the kernel to boot single-user.
-
-
- echo [
args
]
- Displays args on the console device.
-
-
- help
- Prints a list of available commands and machine dependent commands, if
any.
-
-
- machine
[
command
]
- Issues machine-dependent commands. These are defined for hppa
architecture:
-
-
console- Displays or sets the console path.
When invoked with no argument, this command will display the configured
console path found in the stable storage area.
Otherwise, the argument will be interpreted as a console path definition
string, and
boot will attempt to
switch the console configuration to the desired device. The console
definition attempts to follow the PDC syntax, and would have a form
of:
for graphics console, and
for serial console.
The default head and mode for graphics console are 0, that is the
default videomode of the first graphics device. The default serial
settings are 9600 bps, 8 data bits, and no parity.
-
-
keyboard- Displays or sets the keyboard path.
When invoked with no argument, this command will display the configured
keyboard path found in the stable storage area.
Otherwise, the argument will be interpreted as a keyboard path
definition string, and
boot will
attempt to switch the keyboard configuration to the desired port. The
keyboard definition attempts to follow the PDC syntax, and would have
a form of:
hil
for hil keyboard, and
ps2
for PS/2 keyboard.
After changing any path settings, the machine usually has to be restarted
for the changes to have effect.
-
-
- ls [
directory
]
- Prints contents of the specified
directory in long format including:
attributes and file type, owner, group, size, filename.
-
-
- reboot
- Reboots the machine by initiating a warm boot procedure.
-
-
- set []
- If invoked without arguments, prints a list of variables and their values.
If only varname is specified, displays
contents of that variable. If varname and
value are both specified, sets that
variable to the given value. Variables include:
addr- Address at which to load the kernel.
debug- Debug flag if
boot was compiled
with DEBUG defined.
device- Boot device name (i.e.,
lf0a,
sd0a).
howto- Options to pass to the loaded kernel.
image- File name containing the kernel image.
timeout- Number of seconds boot will wait for human intervention before booting
the default kernel image.
-
-
- time
- Displays system time and date.
- /boot
- system bootstrap
- /etc/boot.conf
- system bootstrap's startup file
- /bsd
- kernel image
- /bsd.rd
- kernel image for installation/recovery
Boot the default kernel:
boot> boot
Remove the 5 second pause at boot-time permanently, causing
boot to load the kernel immediately without
prompting:
# echo "boot" >
/etc/boot.conf
Use serial console on the first serial port, with the usual 9600 8N1 settings. A
null modem cable should connect the specified serial port to a terminal.
Useful for debugging.
boot> machine console
rs232.9600.8.none
Boot the kernel named
/bsd from the second
SCSI disk in “User Kernel Configuration” mode (see
boot_config(8)).
This mechanism allows for the explicit enabling and disabling of devices
during the current boot sequence, as well as the modification of device
parameters. Once booted, such changes can be made permanent by using
config(8)'s
-e option.
boot> boot sd1a:/bsd
-c
gzip(1),
autoconf(4),
ddb(4),
boot_config(8),
boot_hppa(8),
reboot(8)
This program was written by Michael Shalayeff for
OpenBSD
2.1. The hppa specific parts were written by Michael Shalayeff and
Miodrag Vallat for
OpenBSD 3.1.
Making mistakes in console paths may cost you a toupee.
Changing the display resolution (mode) on a graphics console does not work
correctly.
![[OpenBSD]](/openbsd.gif){kind=small}