BOOT(8) | System Manager's Manual (hppa) | BOOT(8) |
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:
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:
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.>> 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:
-acds
]boot
variables will be used.
-a
root
device
to use.-c
-d
-s
console
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:
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
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:
After changing any path settings, the machine usually has to be restarted for the changes to have effect.
addr
debug
boot
was compiled with DEBUG
defined.device
lf0a
,
sd0a
).howto
image
timeout
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.
September 10, 2015 | OpenBSD-6.1 |