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Intel® Server Board SDS2 Server Management
Revision 1.2
Order Number: A85874-002
27
5.1 Sahalee Baseboard Management Controller
The Sahalee BMC contains a 32-bit RISC processor core and associated peripherals used to
monitor the system for critical events. The Sahalee BMC, packaged in a 156-pin BGA, monitors
all power supplies, including those generated by the external power supplies and those regulated
locally on the Server Board.
The Sahalee BMC also monitors SCSI termination voltage, fan tachometers for detecting a fan
failure, and system temperature. Temperature is measured on each of the processors and at
locations on the Server Board away from the fans. When any monitored parameter is outside the
defined thresholds, the Sahalee BMC logs an event in the System Event Log (SEL).
Management controllers and sensors communicate on the I
2
C-based Intelligent Platform
Management Bus. Attached to one of its private I
2
C bus is Hecetas, which is an ADM1026. The
ADM1026 is a versatile Systems Monitor ASIC. Some of its features include:
• Analog measurement channels
• Fan speed measurement channels
• General-Purpose Logic I/O pins
• Remote temperature measurement
• On-chip temperature sensor
• Chassis intrusion detection
The table below details some of the inputs on Hecetas as used in the SDS2.
Table 14. ADM1026 Input Definition
Pin Signal Name Description
3 N_ADM_DIS_CPU1_L CPU1 Stop Clock
4 N_ADM_DIS_CPU2_L CPU2 Stop Clock
5 CPU2_VID0 CPU2 VID[0]
6 CPU2_VID1 CPU2 VID[1]
9 CPU2_VID2 CPU2 VID[2]
10 CPU2_VID3 CPU2 VID[3]
11 CPU2_VID4 CPU2 VID[4]
12 CPU1_VID0 CPU1 VID[0]
2 CPU1_IERRN CPU1 IERR
1 CPU2_IERRN CPU2 IERR
48 CPU1_VID1 CPU1 VID[1]
47 CPU1_VID2 CPU1 VID[2]
46 CPU1_VID3 CPU1 VID[3]
45 CPU1_VID4 CPU1 VID[4]
44 N_CPU1_THERMTRIPN CPU1 Thermal Trip
43 N_CPU2_THERMTRIPN CPU2 Thermal Trip
16 N_FRONTOPEN+00 Chassis Intrusion