boot(8)
- NetBSD Manual Pages
BOOT(8) NetBSD/mac68k System Manager's Manual BOOT(8)
NAME
boot -- system bootstrapping procedures
DESCRIPTION
Power fail and crash recovery
Normally, the NetBSD kernel on the mac68k architecture is booted from the
native operating system by means of an application program. When the
kernel takes over, it initializes itself and proceeds to boot the system.
An automatic consistency check of the file systems takes place, and
unless this fails, the system comes up to multi-user operations. The
proper way to shut the system down is with the shutdown(8) command.
If the system crashes, it will enter the kernel debugger, ddb(4), if it
is configured in the kernel. If the debugger is not present, or the
debugger is exited, the system will attempt a dump to the configured dump
device (which will be automatically recovered with savecore(8) during the
next boot cycle). After the dump is complete (successful or not), the
system will attempt a reboot.
On most mac68k machines with "soft-power" after the IIcx, the power
switch can be physically rotated and locked in the 'on' position. The
native OS can be configured to automatically start the NetBSD boot pro-
gram. Additionally, the NetBSD boot program can be configured to boot
NetBSD without intervention. When a system is so configured, it can
crash or lose power and reboot back to a fully multi-user state without
any intervention.
The boot application
The boot application runs in the native OS on the system. It has a dia-
log where booting preferences may be changed and an option whereby these
options may be saved. The preferences are stored in the program itself,
not in a preferences folder--thus allowing two separate copies of the
program to be configured differently (e.g. to boot different netbsd or
netbsd.test, or to boot from two different drives).
One option that may be specified is a boot to single-user mode. This
stops the boot process very early on and allows system maintenance. If
one wishes to provide some security at this phase of the boot, remove the
`secure' option from ttye0 in the ttys(5) file.
Another useful option that may be specified is the "serial console"
option. This will allow a serial device (terminal or computer) to act as
a console for the system. This device must be configured to use 9600
baud, eight bits, no parity, and one stop bit (9600-N81). Either the
printer port or the modem port (tty01 and tty00, respectively) may be
used for this.
It is sometimes useful to boot a kernel that resides in a folder in
native OS rather than from the usual location in the NetBSD file system.
A radio button is supplied for this purpose. Note that some programs
will not run properly if the kernel is not found as /netbsd within the
NetBSD file system.
FILES
/netbsd system kernel
SEE ALSO
ddb(4), ttys(5), savecore(8), shutdown(8)
NetBSD 9.1 July 1, 1995 NetBSD 9.1
Powered by man-cgi (2021-06-01).
Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.