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System BIOS
Note: S3 is only supported on the Intel
workstation Technical Product Specification that applies to your product for more information
about the supported sleep states.
This platform can wake from the S1 state using USB devices in addition to the sources
described in Section 3.16 below.
The wake sources are enabled by the ACPI operating systems with cooperation from the
drivers. The BIOS has no direct control over the wake sources when an ACPI operating system
is loaded. The role of the BIOS is limited to describing the wake sources to the operating
system and controlling secondary control / status bits via the differentiated system description
table (DSDT).
The S5 state is equivalent to operating system shutdown. No system context is saved when
going into S5.
3.15 Front Control Panel Support
The platform supports a power button, a reset button, and an NMI button on the control panel.
3.15.1
Power Button
The BIOS supports a front control panel power button. Pressing the power button initiates a
request that the BMC forwards to the ACPI power state machines in the chipset. It is monitored
by the BMC and does not directly control power on the power supply.
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.
92
Intel® 5000 Series Chipsets Server Board Family Datasheet
®
Workstation Board S5000XVN. See the server or
Intel order number D38960-004
Revision 1.1
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