Server Board Family Datasheet

Intel® S5000 Server Board Family Datasheet System BIOS
Revision 1.3
Intel order number D38960-006
105
 Power Button — Off to On
The BMC monitors the power button and the wake up event signals from the chipset. A
transition from either source results in the BMC starting the power-up sequence. Since
the processors are not executing, the BIOS does not participate in this sequence. The
hardware receives the power good and reset signals from the BMC and then transitions
to an on state.
 Power Button — On to Off (operating system absent)
The System Control Interrupt (SCI) is masked. The BIOS sets up the power button event
to generate an SMI and checks the power button status bit in the ACPI hardware
registers when an SMI occurs. If the status bit is set, the BIOS sets the ACPI power
state of the machine in the chipset to the OFF state. The BMC monitors power state
signals from the chipset and transitions an off state to the power supply. As a safety
mechanism, the BMC automatically powers off the system in 4 to 5 seconds if the BIOS
fails to service the request.
 Power Button — On to Off (operating system present)
If an ACPI operating system is running, pressing the power button switch generates a
request via SCI to the operating system to shutdown the system. The operating system
retains control of the system and operating system policy determines the sleep state into
which the system transitions, if any. Otherwise the BIOS turns off the system.
3.15.2 Reset Button
The platform supports a front control panel reset button. Pressing the reset button initiates a
request that the BMC forwards to the chipset. The BIOS does not affect the behavior of the
reset button.
3.15.3 Non-Maskable Interrupt (NMI) Button
The BIOS supports a front control panel NMI button. The NMI button might not be provided on
all front panel designs. Pressing the NMI button initiates a request that causes the BMC to
generate a NMI. The BIOS captures the NMI during boot services time. The operating system
catches the NMI during runtime. During boot services time, the BIOS halts the system upon
detection of the NMI. During runtime, the operating system handles NMIs.
3.16 Sleep and Wake Support
3.16.1 System Sleep States
The platform supports the following ACPI system sleep states:
 ACPI S0 (working) state
 ACPI S1 (sleep) state
 ACPI S3 (suspend) state
 ACPI S4 (hibernate) state
 ACPI S5 (soft-off) state
Note: The S3 state is only supported on the Intel
®
Workstation Board S5000XVN. See the
server or workstation Technical Product Specification that applies to your product for more
information about supported sleep states.