Processor Control Commands; Boot Command; Boot Command Syntax - Digital Equipment VAXstation 4000/60 Condensed Service Information

3.1.4 Processor Control Commands

The following table lists the processor control commands:
Command
BOOT
CONTINUE
HALT
INITIALIZE
START
UNJAM

3.1.4.1 BOOT Command

The BOOT command starts the bootloader, which loads the operating system
and starts it. The BOOT command causes the system to exit console mode and
enter program mode. The BOOT command has the following syntax:
Syntax:
>>> BOOT /[qualifier] [boot_device],[boot_device]...
Table 3–6 describes each term in the BOOT command.
Table 3–6 BOOT Command Syntax
Term
/qualifier
boot_device,
3–16 Using the Console
Function
Bootstraps the operating system
Starts the CPU running at the current program counter (PC)
Stops the CPU
Initializes processor registers
Starts the CPU at a given address
Sets devices to an initial state
Description
This optional qualifier sets the value for R5 for the bootloader.
It is used to select a boot on the disk, or to select a
conversational boot.
The R5 qualifier can be specified in either of the following
formats:
• /R5:xxxxxxxx
• /xxxxxxxx
This optional term is the primary boot device. If no device
is specified, the system attempts to boot the default device.
You can set the default boot device by using the SET BOOT
command.
You may enter optional secondary devices as well; the
secondary device is the device that the bootloader tries to
boot if the primary boot device fails.