Intel SE7520JR2 Technical Manual page 130

Platform Management
5.3.5.5.1 Chassis Intrusion
Some platforms support chassis intrusion detection. On those platforms, the mBMC monitors
chassis intrusion by polling the server input/output (SIO) device. The state of the chassis
intrusion input is provided by the status register of the SIO device. A Chassis Intrusion event is
logged in the System Event Log when a change in the input state is detected.
5.3.5.5.2 Power Button
The Power Button signal is used to toggle system power. The Power Button signal to the mBMC
is activated by a momentary contact switch on the control panel assembly.
The mBMC de-bounces the signal. After de-bouncing the signal, the mBMC routes it directly to
the chipset via the Power Button signal. If the chipset has been initialized by the BIOS, the
chipset responds to the assertion of the signal. It reacts to the press of the switch, not the
release of it.
If the system is in Secure Mode or if the Power Button is forced protected, then when the power
switch is pressed, a Platform Security Violation Attempt event message is generated. No power
control action is taken.
In the case of simultaneous button presses, the Power Button action takes priority over all other
buttons. Due to the routing of the de-bounced Power Button signal to the chipset, the power
signal action overrides the action of the other switch signals.
5.3.5.5.3 Reset Button
An assertion of the control panel Reset signal to the mBMC causes the mBMC to start the reset
and reboot process. This is immediate and without the cooperation of any software or operating
system running on the system.
The reset button is a momentary contact button on the control panel. Its signal is routed through
the control panel connector to the mBMC, which monitors and de-bounces it.
If Secure Mode is enabled or if the button is forced protected, the reset button does not reset
the system, but instead a Platform Security Violation Attempt event message is generated.
5.3.5.5.4 Diagnostic Interrupt Button (Control Panel NMI)
As stated in the IPMI 1.5 Specification, a diagnostic interrupt is a non-maskable interrupt or
signal for generating diagnostic traces and 'core dumps' from the operating system. The mBMC
generates NMIs and can be used for an OEM-specific diagnostic control panel interface.
The diagnostic interrupt button is connected to the mBMC through the control panel connector.
A diagnostic interrupt button press causes the mBMC to generate a SEL entry that will trigger
an NMI PEF OEM action. The event attributes are: Sensor Type code - 13h (Critical Interrupt)
and Sensor Specific offset - 0h.
5.3.5.5.5 Chassis Identify Button
The chassis identify button on the control panel toggles the state of the Chassis ID LED. If the
Chassis ID LED is off, pressing this button causes the LED to blink for 15 seconds. After this
130
C78844-002
Intel® Server Board SE7520JR2
Revision 1.0