Chapter 3 Functional Description 3-11
Note – Connector J3603 powers a Sun-supplied CPU fan for CPU modules with
straight fin heatsinks (e.g., 360 MHz, part number 501-5148-xx; 440 MHz, part
number 501-5149-xx). An OEM-supplied front fan may also be required for CPU
modules with pin fin heatsinks depending on system thermal performance.
Connector J3602 powers an optional fan on all versions of CPU modules used with
the Ultra AXi.
3.4.4 OBP Functions for ASM
Under OBP, the 'env-monitor' variable defines 4 options to perform ASAM functions.
In OBP-Ver: 3.10.4, by default ASM is turned off.
Temperature monitoring provides a “Warning” message when the CPU temperature
rises out of limits. At extreme temperatures, ASM will initiate a “System
ShutDown”.
Voltage Monitoring provides a “Warning” when low voltages are detected.
The fan control function drives the fan at maximum speed. The fan monitor function
detects non operational fan(s).
The OBP is also responsible for generating the required 'ASM node' with associated
'property' for Solaris Drivers to implement ASM functions.
Refer to Appendix D for details on how OBP implements the ASM features.
3.4.5 Solaris Driver Functions for ASM
In the add-on package released for Solaris 2.6 HW: 3/98, ASM device drivers are
provided to implement ASM functions.
Temperature monitoring provides a “Warning” message if the CPU overheats. At
sufficient out of limit temperatures, the ASM driver initiates a “System ShutDown”.
Voltage monitoring provides a “Warning” when low voltages are detected.
The fan control function drives the fan at a defined speed. Internal decision tables
determine the speed of the fan to one of the four predefined speeds. The decision is
based on the input values of the temperature readings at the four thermistors. The
fan monitor function will detect a non-operational fan.
Caution – You must use the boot -r reconfiguration command each time the
machine is booted to attach the ASM drivers. Otherwise, the system runs without
ASM protection at the Solaris level.
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