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Intel® Server Board SE7320SP2 & Intel Server Board SE7525GP2 TPS Platform Management
Revision 2.0
121
To reset the system without a power state change, the mBMC:
1. Asserts the System Reset signal.
2. Holds this state for as long as the reset button is pushed. When a command is used to
generate a system reset, the state is held for the stipulated time.
3. De-asserts the System Reset signal.
5.3.2.2 Reset Control Sources
The following table shows the reset sources and the actions taken by the system.
Table 52: System Reset Sources and Actions
# 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
5.3.3 Temperature-based Fan Speed Control
Server board hardware implements an ambient-temperature-based Fan Speed control that is
part of normal system operation. With one exception, the management controller does not
participate in fan speed control. The feature allows the server board 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 server board has two analog Fan Speed signals that are driven by pulse-width modulator
(PWM) circuits by the server board 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 SDR or table is loaded as part of the server board 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 SE7320SP2 or SE7525GP2 as a server board-only product, but can be enabled
via a management controller configuration change.
5.3.3.1 Fan Kick Start
Some fans may not begin rotating unless started at high speed. To ensure that the fans start,
the server board hardware will start and run the fans at high speed for a brief interval following
system power up.