System Reset Action Codes; System Resets - Digital Equipment VAXft Systems 810 Service Information

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When the EHS determines that a zone or CPU should be removed from the

conﬁguration, it forces a reset on the CPU. The reset results in the system console

being invoked from serial ROM by the hardware. When system console runs, it

attempts to determine the reason for the reset, which in turn may determine

the actions performed by the console. The EHS uses the ﬁelds in the CCA reset

dispatch block (at offset CCA560$R_RESET_BLOCK) to pass reset reason codes

to the console. The ﬁelds are:

RDB$L_RESET_CODE - The reset reason code. This longword ﬁeld is actually

composed of two one-word ﬁelds:

•

RDB$W_ACTION - The reset action. This word instructs the console on the

action that needs to be taken. The reset action codes used by the EHS are

described in Table 4–26.

•

RDB$W_REASON - The reset reason. This ﬁeld is additional data supplied

by the OpenVMS operating system which indicates the reason for the reset.

The code is printed in hex on the operator console after the reset action

is completed. The reset reason codes used by the EHS are described in

Table 4–27.

RDB$L_REASON_VALID - The 1's complement of the reset reason code longword.

RDB$L_DISPATCH - This ﬁeld is used only if the system console is to continue

the OpenVMS operating system after completing reset actions. In all reset cases

by the EHS, it will be 0.

Table 4–26 System Reset Action Codes

Decimal

Value

Description

This code will cause the system console to enter its halt loop, which will

establish IZC to the other zone, without invoking any diagnostics. Currently,

this reset action is requested only when the EHS is handling a single-bit

error.

This code will cause the system console to invoke diagnostics. The

diagnostics which run depend on the cross-link mode at the time. Following

diagnostics, the system console will enter its halt loop, and establish IZC to

the other zone. The code is used when a zone or CPU is being removed due

to a system error.

This code will cause the same actions as CPURESET$K_DIAGS. This code

is used when a zone is being removed by operator action (that is, a user

command).

Error Handling and Analysis 4–51

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