BMC Functional Specifications ESB2 BMC Core TPS
Revision 1.0
Intel order number E18291-001
272
22.17.1 Interactions with DIMM Thermal Management
22.17.1.1 Thermal Profile Data
The BIOS requires knowledge of characteristics to use as input into its calculations for DIMM
throttling setup. This depends on which fan profile is enabled. The BIOS retrieves the
information from the BMC at system boot.
The BMC supports this with thermal profile data SDRs, which allow this data to be stored in the
BMC’s SDR repository and can be customized by fan domain. Each thermal profile SDR can
apply to one or more profiles in a fan domain.
The BMC requires these SDRs to follow a standard structure and provides a mechanism to
retrieve the data, but the BMC does not interpret or use the thermal profile data information in
any manner.
The BMC expects that only one set of thermal profile data SDRs, such as for a board / chassis
combination, is present in the SDR repository at one time, and that each profile is associated
with only one SDR per supported throttling type. If multiple SDRs match one throttling type and
profile, only the data from one of these SDRs is retrievable. The BMC does not guarantee the
order in which the SDRs are processed.
22.17.1.2 AMB Aggregate Margin Temperature Sensors
The BMC implements one advanced memory buffer (AMB) aggregate margin temperature
sensor for each rear fan domain.
22.17.2 ASHRAE Compliance
System requirements for ASHRAE compliance is defined in the S7000FC4UR Fan Speed
Control & Thermal Management Platform Architecture Specification. Altitude-related
considerations are handled through the chipset throttling configuration.
22.17.3 Platform Configuration
22.17.3.1 Overview
The base fan speeds for each domain are determined by stepwise linear controls linked to the
Front Panel ambient temperature sensor (32h). Each domain also has a stepwise linear domain
max control based on that sensor.
22.17.3.2 Model 0 Considerations
The platform is required to support a “Model 0” fan configuration in which memory fans 2 and 4
are not installed. The Thermal Profile Data and Tcontrol SDR parameters are determined by the
system thermals engineer to maintain sufficient but non-redundant cooling.
The determination of which set of parameters to use is made at the time of SDR installation.
Sensor 6Dh exposes an aggregation of all of the fan module presence signals, and the
FRUSDR utility’s DISCRETE_SENSOR probing feature is used to compare the sensor reading
against various expected values:
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