Operating System Boot, Sleep, and Wake ESB2 BMC Core TPS
Revision 1.0
Intel order number E18291-001
200
See Section 17.4 for a description of supported sleep states and wake devices.
17.3 Front Control Panel Support
In the control panel, the platform supports:
Power button
Reset button
NMI button
17.3.1 Power Button
The BIOS supports a front control panel power button. Pressing the power button initiates a
request that is forwarded directly to the chipset.
17.3.1.1 Power Button — Off to On
The power button press is forwarded directly to the chipset. Since the processors are not
executing, the BIOS does not participate in this sequence.
17.3.1.2 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.
17.3.1.3 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.
17.3.2 Reset Button
The platform supports a front control panel reset button. Pressing the reset button initiates a
request that is forwarded directly to the chipset. The BIOS does not affect the behavior of the
reset button.
17.3.3 NMI Button
The BIOS supports a front control panel non-maskable interrupt (NMI) button. Pressing the NMI
button initiates a request that is forwarded directly to the chipset.
See Section 17.5 for information on NMI handling.
Note: The Front Panel NMI Button is recessed to prevent accidental triggering.
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