Intel Server Board S2400BB

Intel® Server Board S2400BB TPS
Revision 2.0
48
6.5 Fault Resilient Booting (FRB)
Fault resilient booting (FRB) is a set of BIOS and BMC algorithms and hardware support that allow a
multiprocessor system to boot even if the bootstrap processor (BSP) fails. Only FRB2 is supported using
watchdog timer commands.
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.
6.6 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.
6.7 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.
The BMC provides FRU device command access to its own FRU device and to the FRU devices throughout
the server. The FRU device ID mapping is defined in the Platform Specific Information. The BMC controls the
mapping of the FRU device ID to the physical device