Sensor Monitoring; Field Replaceable Unit (Fru) Inventory Device - Intel S2400SC Technical Product Specification

Platform Management Functional Overview
FRB2 refers to the FRB algorithm that detects system failures during POST. The BIOS uses the
BMC watchdog timer to back up its operation during POST. The BIOS configures the watchdog
timer to indicate that the BIOS is using the timer for the FRB2 phase of the boot operation.
After the BIOS has identified and saved the BSP information, it sets the FRB2 timer use bit and
loads the watchdog timer with the new timeout interval.
If the watchdog timer expires while the watchdog use bit is set to FRB2, the BMC (if so
configured) logs a watchdog expiration event showing the FRB2 timeout in the event data bytes.
The BMC then hard resets the system, assuming the BIOS-selected reset as the watchdog
timeout action.
The BIOS is responsible for disabling the FRB2 timeout before initiating the option ROM scan
and before displaying a request for a boot password. If the processor fails and causes an FRB2
timeout, the BMC resets the system.
The BIOS gets the watchdog expiration status from the BMC. If the status shows an expired
FRB2 timer, the BIOS enters the failure in the system event log (SEL). In the OEM bytes entry
in the SEL, the last POST code generated during the previous boot attempt is written. FRB2
failure is not reflected in the processor status sensor value.
The FRB2 failure does not affect the front panel LEDs.
6.8

Sensor Monitoring

The BMC monitors system hardware and reports system health. Some of the sensors include
those for monitoring

Component, board, and platform temperatures

Board and platform voltages

System fan presence and tach

Chassis intrusion

Front Panel NMI

Front Panel Power and System Reset Buttons

SMI timeout

Processor errors
The information gathered from physical sensors is translated into IPMI sensors as part of the
"IPMI Sensor Model". The BMC also reports various system state changes by maintaining
virtual sensors that are not specifically tied to physical hardware.
See Appendix B – Integrated BMC Sensor Tables for additional sensor information.
6.9

Field Replaceable Unit (FRU) Inventory Device

The BMC implements the interface for logical FRU inventory devices as specified in the
Intelligent Platform Management Interface Specification, Version 2.0. This functionality provides
commands used for accessing and managing the FRU inventory information. These commands
can be delivered through all interfaces.
62 Intel order number G36516-002
Intel® Server Board S2400SC TPS
Revision 2.0