HP Moonshot 1500 Chassis User Manual download pdf (Page 97)

• System power cycle

• Pre-timeout interrupt (optional)

The system reset on timeout, system power off on timeout, and system power cycle on timeout

action selections are mutually exclusive. The watchdog timer is stopped whenever the system is

powered-down. A command must be sent to start the timer after the system powers up.

Watchdog timer use field and expiration flags

The watchdog timer provides a timer use field that indicates the current use assigned to the watchdog

timer. The watchdog timer provides a corresponding set of timer use expiration flags that are used

to track the type of timeout that had occurred.

The timeout use expiration flags retain their state across system resets and power cycles, as long

as the MC remains powered. The flags are normally cleared solely by the set watchdog timer

command; with the exception of the don’t log flag, which is cleared after every system hard reset

or timer timeout.

The timer use fields indicate:

DescriptionTimer use field

An FRB-2 (fault-resilient booting, level 2) timeout has occurred indicating that the

last system reset or power cycle was due to the system timeout during POST,

presumed to be caused by a failure or hang related to the bootstrap processor.

BIOS FRB2 timeout

In this mode, the timeout occurred while the watchdog timer was being used by

the BIOS for some purpose other than FRB-2 or OS load watchdog.

BIOS POST timeout

The last reset or power cycle was caused by the timer being used to watchdog

the interval from boot to OS up and running. This mode requires system

OS load timeout

management software, or OS support. BIOS should clear this flag if it starts this

timer during POST.

Indicates that the timer was being used by SMS. During run-time, SMS starts the

timer, then periodically resets it to keep it from expiring. This periodic action

SMS OS watchdog timeout

serves as a heartbeat that indicates that the OS (or at least the SMS task) is still

functioning. If SMS hangs, the timer expires and the MC generates a system

reset. When SMS enables the timer, it should make sure the SMS bit is set to

indicate that the timer is being used in its OS watchdog role.

Indicates that the timer was being used for an OEM-specific function.OEM

In a multiprocessor system, the bootstrap processor is defined as the processor that, on system power-up or hard reset,

is allowed to run and execute system initialization (BIOS POST) while the remaining processors are held in an idle state

awaiting startup by the multiprocessing OS.

Using the timer use field and expiration flags

The software that sets the timer use field is responsible for managing the associated timer use

expiration flag. For example, if SMS sets the timer use to SMS/OS watchdog, then that same SMS

is responsible for acting on and clearing the associated timer use expiration flag.

In addition, software should only interpret or manage the expiration flags for watchdog timer uses

that it set. For example, BIOS should not report watchdog timer expirations or clear the expiration

flags for non-BIOS uses of the timer. This is to allow the software that did set the timer use to see

that a matching expiration occurred.

Watchdog timer event logging

By default, the MC automatically logs the corresponding sensor-specific watchdog sensor event

when a timer expiration occurs. A don’t log bit is provided to temporarily disable the automatic

logging. The don’t log bit is automatically cleared (logging re-enabled) whenever a timer expiration

occurs.

Standard command specification 97

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 188 189

Comments to this Manuals

No comments

HP Moonshot 1500 Chassis User Manual Page 97

Comments to this Manuals

Related products and manuals for Chassis components HP Moonshot 1500 Chassis