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Platform Management
Intel® Server Board SE7520AF2 TPS
172
Revision
1.2
Intel order number C77866-003
#
Reset Source
System Reset?
mBMC Reset
1
Standby power comes up
No (no DC power)
Yes
2
Main system power comes up
Yes
No
3
Reset button or in-target probe (ITP) reset
Yes
No
4
Warm boot (example: DOS Ctrl-Alt-Del)
Yes
No
5
Command to reset the system
Yes
No
6
Set Processor State command
Yes
No
7
Watchdog timer configured for reset
Yes
No
8 FRB3
failure
Yes
No
9 PEF
action
Optional
No
6.3.3
Temperature-based Fan Speed Control
Baseboard hardware implements an ambient-temperature-based Fan Speed control that is part
of
normal system operation.
The feature allows the baseboard to drive different fan speeds
based on various temperature measurements in order to lower the acoustic noise of the system.
The ambient-temperature thresholds at which the Fan Speed increases does not correspond to
a non-critical (warning) condition for the fan - since the fan’s state is still ‘OK’ from the system
point-of-view.
The baseboard has two analog Fan Speed signals that are driven by pulse-width modulator
(PWM) circuits by the baseboard hardware. These signals can be driven to several levels
according to temperature measurements. Multiple bytes of a Sensor Initialization Table is used
to hold parameters that set the temperature thresholds and corresponding PWM duty cycles.
This table is loaded as part of the baseboard configuration.
The management controller firmware expects to find an LM30 temperature sensor on the front
panel board. Thus, the ambient temperature-based fan speed control capability is not enabled
by default for SE7520AF2 as a baseboard-only product, but can be enabled via a management
controller configuration change.
6.3.3.1
Fan Kick Start
Some fans may not begin rotating unless started at high speed. To ensure that the fans start,
the baseboard hardware will start and run the fans at high speed for a brief interval following
system power up.
6.3.4
Front Panel Control
The mBMC provides the main ‘front panel control’ functions. These include control of the system
Power Button, Reset Button, Diagnostic Interrupt (Front Panel NMI) Button, System Identify
Button, System ID LED, Status/Fault LED, and Chassis Intrusion Switch. Front panel control
also includes the front panel lockout features.
6.3.4.1 Power
Button
The front panel
Power Button
signal is routed to the mBMC, after debouncing this signal, the
mBMC asserts PWBTOUT signal to the chipset PWRBTN input. The chipset responds by