Installation guide

Table 3–1: Console Environment Variables

Variable Action

boot_reset When set to on, resets the hardware on boot

boot_osflags A combination of ﬂags used to control the boot loader and

kernel

bootdef_dev Identiﬁes the boot device

boot_file Identiﬁes the kernel to boot (on DEC 4000 and DEC 7000

processors)

cpu_enable Selectively enables particular processors from the console

To prepare the hardware:

1. Set the auto_action variable to halt:

>>> set auto_action halt

The previous command will halt the system at the console prompt each

time your system is turned on, when the system crashes, or when you

press the halt button.

2. For DEC 3000 and DEC 7000 processors, set the boot_reset variable

to on to force the resetting of the hardware before booting:

>>> set boot_reset on

3. For DEC 3000 processors, set the time to wait to reset the SCSI device

before booting:

>>> set scsi_reset 4

4. Use the following procedure to set the boot_osflags variable and the

boot device:

a. Determine which options to the boot_osflags variable you want.

Table 3–2 lists the options.

Table 3–2: Options to the boot_osﬂags Variable

Option Action

Boot to multiuser mode. (By default, the kernel boots to

single-user mode.)

Use the kdebug debugger to debug the kernel. (By default,

kdebug is not used.)

Starting Up and Shutting Down the System 3–7