System information

6-12
AlphaServer 800 Service Guide
Variable Attributes Description
boot_osflags
(continued)
boot_flags: The hexadecimal value of the bit
number or numbers to set. To specify multiple
boot flags, add the flag values (logical OR).
1—Bootstrap conversationally (enables you to
modify SYSGEN parameters in SYSBOOT).
2—Map XDELTA to running system.
4—Stop at initial system breakpoint.
8—Perform a diagnostic bootstrap.
10—Stop at the bootstrap breakpoints.
20—Omit header from secondary bootstrap file.
80—Prompt for the name of the secondary
bootstrap file.
100—Halt before secondary bootstrap.
10000—Display debug messages during booting.
20000—Display user messages during booting.
DIGITAL UNIX: The following parameters are
used with this operating system:
a—Autoboot. Boots /vmunix from bootdef_dev,
goes to multi-user mode. Use this for a system
that should come up automatically after a power
failure.
s—Stop in single-user mode. Boots /vmunix to
single-user mode and stops at the # (root) prompt.
i—Interactive boot. Requests the name of the
image to boot from the specified boot device.
Other flags, such as -kdebug (to enable the kernel
debugger), may be entered using this option.
D—Full dump; implies s as well. By default, if
DIGITAL UNIX crashes, it completes a partial
memory dump. Specifying D forces a full dump
at system crash.
Common settings are a, autoboot, and Da,
autoboot and create full dumps if the system
crashes.
bus_probe_
algorithm
NV Specifies a bus probe algorithm for the system.
This setting is fixed and cannot be altered.