DEC 4000 AXP Service Manual page 169

Table 6–3 (Cont.) Environment Variables Set During System Configuration
Variable Attributes
boot_osflags NV,W
tta*_baud NV
Key to variable attributes:
NV - Nonvolatile. The last value saved by system software or set by console commands is preserved
across system initializations, cold bootstraps, and long power outages.
W - Warm nonvolatile. The last value set by system software is preserved across warm bootstraps
and restarts.
Function
Default additional parameters to be passed to system
software during booting if none are specified by the
boot command.
On the OpenVMS AXP operating system, these
additional parameters are the root number and boot
flags. The default value when the system is shipped is
NULL.
The following parameters are used with the DEC
OSF/1 operating system:
a Autoboot. Boots /vmunix from bootdef_dev, goes
to multiuser 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. Request 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
DEC OSF/1 V2.1 crashes, it completes a partial
memory dump. Specifying ''D'' forces a full
dump at system crash.
Common settings are a, autoboot; and Da, autoboot;
but create full dumps if the system crashes.
Here "*" may be 0 or 1, corresponding to the primary
console serial port, tta0 or the auxiliary console serial
port, tta1. Specifes the baud rate of the primary
console serial port, tta0. Allowable values are 600,
1200, 2400, 4800, 9600, and 19200. The initial value
for tta0 is read from the baud rate select switch on the
OCP.
System Configuration and Setup 6–31