Intel® Server System Server System "Emerald Ridge ... - CTL

錯 誤 ! 尚 未 定 義 樣 式 。錯 誤 ! 尚 未 定 義 樣 式 。 EPSIn order for the BMC to handle these values in its fan speed control algorithms, any TcontrolSDRs referencing these sensors must have the signed sensor flag bit set. The clamptemperature in the SDR is interpreted as a two’s-complement signed integer.3.18 IOH thermal Margin SensorEmerald Ridge platform support two IOH, each IOH supports on-die thermal sensor. The IPMIsensor reading is the negative of the corresponding IOH thermal sensor.3.19 Memory Buffer thermal Margin SensorEmerald Ridge supports maximum eight memory risers. Each memory riser has two memorybuffer devices. Among others capabilities, this component provides an on-die thermal sensor.SDRs for these aggregate sensors should be set to “sensor scanning disabled” state and thatenabling/disabling of the sensors occurs by the BMC FW when BIOS updates DIMM map using“Set Fan Control Configuration” command.During POST, BIOS must send memory buffers population along with DIMM population to BMCusing “Set Fan Control Configuration” OEM command, this is even applied during memory hotplug and online/offline memory operation. BMC will enable the corresponding aggregatememory buffer temperature sensor if and only if at least one of the associated memory bufferdevices is present.BMC will monitor the temperature sensors for memory buffers devices regardless of thepresence of any associated DIMMs.The BMC aggregates the calculated thermal margins for the memory buffers devices in a similarfashion as is done for the DIMM thermal margins, with one aggregate IPMI sensor each formemory risers 1&2, 3&4, 5&6,and 7&8. The most positive margin of a group of Mill Brookcomponents is taken as the dominant margin. This value then becomes the value of theassociated memory buffer aggregate thermal margin sensor. This sensor is implemented asauto rearm.3.20 Add in card thermal margin sensorThe BMC implements one IPMI thermal sensor for add-in card zone-1BMC calculates add in card thermal margin sensor from 3 physical discrete sensors (2 on thebaseboard and 1 on the IO Riser card). This IPMI sensor value is calculated according to thefollowing equation:Sensor value = T2 – T1 + TioT2 and T1 are discrete LM75 sensors located in add-in card zone-2 and zone-1 respectively.Tio is the discrete sensor located on IO riser board.The IPMI sensor is implemented as an auto-rearm threshold sensor.36Intel ConfidentialRevision 1.1