Vax 613 0S Instruction Manual Page 213

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Table 49 Processor Restart Codes
Halt
Code Description
0 Reserved
1 Powerup has occurred
2 Console operator halted system through halt command (ctrl-P)
3 Console operator requests a system crash
4 Processor executed HALT instruction in kernel mode
5 Processor halted due to Kernel-Stack-Not-Valid interrupt
6 Processor halted due to Double Error abort
7 Invalid SCBB
8 Invalid PTBR
9-FF Reserved
Other Implementation-specific
Power On
Console mode is entered at power on if the default recovery action is specified
to be Halt. If the default recovery action is set for either Restart/Boot/Halt or
Boot/Halt, Console mode is entered if the boot operation fails.
Boot Failure
Console mode is entered, if the boot fails when the system is booted for any
reason.
External HALT
Console mode is entered if the Halt button on the system box is pressed at
any time.
14.5.4 Reentry Control
Two flags in HWRPB prevent repeated firmware attempts and failures to
bootstrap or restart the operating system These flags are ‘‘bootstrap in progress’’
and ‘‘restart in progress.’’
1
If a system bootstrap or restart would occur
automatically but the corresponding flag is set, the system firmware assumes
that an attempt has been made and failed and does not try the operation again.
System bootstrap can occur as the result of the operators entering a BOOT
command, a restart failure, or a processor halt.
1
See Section 16.5.2.
Powerup Initialization and Firmware Entry 14–13
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