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System Setup and Configuration
3.8 Firmware Commands and Utilities Used in System Configuration
Table 3–4 (Cont.) Virtual Memory Bootstrap (VMB) Boot Flags
Bit
Name
Description
2
RPB$V_INIBPT
Initial breakpoint. If RPB$V_DEBUG is set, the
OpenVMS operating system executes a BPT instruction
in module INIT immediately after enabling mapping.
3
RPB$V_BBLOCK
Secondary bootstrap from bootblock. When set, VMB
reads logical block number 0 of the boot device and
tests it for conformance with the bootblock format. If
in conformance, the block is executed to continue the
bootstrap. No attempt is made to perform a Files–11
bootstrap.
4
RPB$V_DIAG
Diagnostic bootstrap. When set, the load image requested
is [SYS0.SYSMAINT]DIAGBOOT.EXE.
5
RPB$V_BOOBPT
Bootstrap breakpoint. When set, a breakpoint instruction
is executed in VMB and control is transferred to XDELTA
before booting.
6
RPB$V_HEADER
Image header. When set, VMB transfers control to the
address specified by the file’s image header. When not
set, VMB transfers control to the first location of the load
image.
8
RPB$V_SOLICT
File name solicit. When set, VMB prompts the operator
for the name of the application image file. A maximum
39 character file specification is allocated at RPB$T_
FILE. Only 16 characters are utilized in both tape boot
and network MOP V3 booting.
9
RPB$V_HALT
Halt before transfer. When set, VMB halts before
transferring control to the application image.
31:28 RPB$V_TOPSYS
This field can be any value from 0 through F. This
flag changes the top-level directory name for system
disks with multiple operating systems. For example, if
TOPSYS is 1, the top-level directory name is [SYS1...].
This does not apply to network bootstraps.
3.8.5.3 Setting the Halt Action
The user-defined halt action feature allows users to determine what action
should be taken on error halts and at power-up. The halt action is defined
using the SET HALT command and overrides the setting of the Break Enable
/Disable switch.
Table 3–5 summarizes the action taken on all halt conditions (excluding
external halts). The user-defined halt is used when the O/S Mailbox halt action
field is 0 and on power-up if breaks are enabled. Refer to Appendix A for an
example of the SET HALT command.
3–54 System Setup and Configuration