Server Board Family Datasheet

Intel® S5000 Server Board Family Datasheet System Management
Revision 1.3
Intel order number D38960-006
129
4.13.9 Processor Thermal Control Monitoring (Prochot)
The BMC monitors processor thermal control monitoring for each processor. This functionality is
provided by the National Semiconductor* LM94 system management controller device, which
provides a reading of the percentage of time that the processor ProcHot signal is asserted over
a given measurement window. The BMC implements this as a threshold sensor on a per-
processor basis.
4.13.10 CPU Population Error Sensor
The only processor population check that the BMC does is to verify that a processor is installed
in slot 1. The hardware does not allow the server to power up in this state.
At BMC initialization, this sensor is first set to a de-asserted state. The BMC then checks for
CPU population errors and sets the new value accordingly. If an error is detected and the SDR
is so configured, a SEL event will be logged. The BMC checks for this fault condition and
updates the sensor state at each attempt to DC power-on the system. At each DC power-on
attempt, a beep code is generated if this fault is detected. BMC beep codes are listed in Table
42.
Note: This sensor is an auto-re-arm sensor but is not re-armed at system DC power-on or for
system resets. The correct way to clear this sensor state is to correct the problem by AC
powering down the server, installing a processor into slot 1, then AC powering on the server.
4.14 Standard Fan Management
The BMC controls and monitors the system fans. For each fan, there is a fan speed sensor that
provides fan failure detection. Some platforms also provide fan presence detection which the
BMC maps into per-fan presence sensors. See the server or workstation Technical Product
Specification that applies to your product for more information.
It is possible for the BMC to control the speed of some fans. Controllable fans are divided into
fan domains in which there is a separate fan speed control for each domain and a separate fan
control policy configurable for each domain.
A fan domain can have a set of temperature and fan sensors associated with it. These sensors
are used to determine the current fan domain state. A fan domain has three states: sleep,
nominal, and boost. The sleep and boost states have fixed, but configurable, fan speeds
associated with them. The nominal state has a variable speed determined by the fan domain
policy (see section 4.14.1, Nominal Fan Speed). An OEM SDR record is used to configure the
fan domain policy (see Section 4.14.1).
Note: See the server or workstation Technical Product Specification that applies to your product
for more information
The fan domain state is controlled by several factors. The following states are in order of
precedence, from high to low: