Sun Microsystems CP2500 manual Typical Cycle From Power Up to Shutdown

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The Netra CP2500 monitors its CPU diode temperature and issues warnings at both the OpenBoot PROM and Solaris OS levels when these environmental readings are out of limits. At the Solaris OS level, the application program monitors and issues warnings for the board. At the OpenBoot PROM level, the CPU diode temperature is monitored.

Typical Cycle From Power Up to Shutdown

This section describes a typical environmental monitoring cycle from power up to shutdown.

Environmental Monitoring Protection at the OpenBoot PROM

The OpenBoot PROM monitors the CPU diode temperature at the fixed polling rate of 10 seconds and displays warning messages on the default output device whenever the measured temperature exceeds the preprogrammed warning temperature or the critical temperature. These values have defaults set by the SMC and can not be changed for the OpenBoot PROM-level monitoring.

OpenBoot PROM-level protection is enabled and can not be disabled. If the board temperature exceeds the shutdown temperature, the SMC will shut down power to the Netra CP2500 CPU. The OpenBoot PROM will send a warning or critical temperature message to the user that the Netra CP2500 is overheating.

Environmental Monitoring Protection at the Operating System Level

Monitoring changes in the sensor temperatures can be a useful tool for determining problems with the room where the system is installed, functional problems with the system, or problems on the board. Establishing baseline temperatures early in deployment and operation could be used to trigger alarms if the temperatures from the sensors increase or decrease dramatically. If all the sensors go to room ambient, power has probably been lost to the host system. If one or more sensors rise in temperature substantially, there might be a system fan malfunction, the system cooling might have been compromised, or room air conditioning might have failed.

26 Netra CP2500 Board Programming Guide • March 2007

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Contents Netra CP2500 Board Programming Guide Page Contents User Flash Figures Vi Netra CP2500 Board Programming Guide March Tables Viii Netra CP2500 Board Programming Guide March Code Samples Netra CP2500 Board Programming Guide March Preface How This Book Is OrganizedUsing Unix Commands Typographic ConventionsShell Prompts Related DocumentationThird-Party Web Sites Documentation, Support, and TrainingSun Welcomes Your Comments Watchdog Timer OverviewPicl Plug-In Module 1Watchdog Plug-In Interfaces for Netra CP2500 Board Software 2Properties Under watchdog-controllerNode3Properties Under watchdog-timerNode HEALTHY#Watchdog Node Management Code Code Example 1-1System Watchdog Node Management Code ExampleCode Example 1-1System Watchdog Node Management Code Example Usagestr Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Null Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Notreached Code Example 1-1System Watchdog Node Management Code Example OpenBoot Prom Interface Netra CP2500 Board Programming Guide March Environmental Monitoring Typical Environmental Monitoring System Application Environmental Monitoring Component Compatibility1Compatible Environmental Monitoring Components I2C Typical Cycle From Power Up to Shutdown Environmental Monitoring Protection at the OpenBoot PromPost Shutdown Recovery Hardware Environmental Monitoring Functions 3I2C ComponentsEnvironmental Monitoring CPU Switching Power On and Off Inlet, Exhaust, and CPU Temperature MonitoringNetra CP2500 Board Programming Guide March OpenBoot Prom Environmental Monitoring Critical Temperature Response at OpenBoot PromUsing the show-sensorsCommand at OpenBoot Prom Environmental Monitoring Application ProgrammingReading Temperature Sensor States Using 4PICL Temperature Sensor Class Node PropertiesUsing a Configuration File for Sensor Information Solaris Driver InterfaceSample Application Program Code Example 2-1Sample envmond Application ProgramCode Example 2-1Sample envmond Application Program Code Example 2-1Sample envmond Application Program Code Example 2-1Sample envmond Application Program Reading the CPU Temperature Environmental Limits Prtdiag command example5Description of Values Displayed by Solaris Commands User Flash User Flash Usage and ImplementationUser Flash Driver OpenBoot Prom Device Tree and Properties1User Flash Node Properties Application Programming Interface User Flash Device FilesInterface Header File 2System CallsStructures to Use in Ioctl Arguments Code Example 3-1PROM Information StructureExample Programs ErrorsCode Example 3-2User Flash Interface Structure Read Example Program Code Example 3-3Read Action on User Flash DeviceWrite Example Program Code Example 3-4Write Action on User Flash DeviceCode Example 3-4Write Action on User Flash Device Block Erase Example Program Code Example 3-5Block Erase Action on User Flash DeviceCode Example 3-5Block Erase Action on User Flash Device Sample User Flash Application Program Code Example 3-6Sample User Flash Application ProgramCode Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Index PiclWatchdog-controller, 3 Watchdog-timer, 3