Intel® Server Board SE7520BD2 Technical Product SpecificationPlatform Management Architecture
Revision 1.3 Intel Confidential
101
Critical Condition
Any critical or non-recoverable threshold crossing associated with the following events:
• Temperature, voltage, or fan critical threshold crossing
• Power subsystem failure. The BMC asserts this failure whenever it detects a power
control fault (e.g., the BMC detects that the system power is remaining on even though
the BMC has deasserted the signal to turn off power to the system).
• “Critical Event Logging” errors, including: System Memory Uncorrectable ECC error and
Fatal/Uncorrectable Bus errors, such as PCI SERR and PERR
Non-Critical Condition
• Temperature, voltage, or fan non-critical threshold crossing
• Chassis intrusion
Degraded Condition
• One or more processors are disabled by Fault Resilient Boot (FRB) or BIOS
• BIOS has disabled or mapped out some of the system memory
4.3.4.6 Chassis Intrusion Switch
Some platforms support chassis intrusion detection. On these platforms, the mBMC monitors
the state of the Chassis Intrusion signal and makes the status of the signal available via the Get
Chassis Status command and Physical Security sensor state. If enabled, a chassis intrusion
state change causes the mBMC to generate a Physical Security sensor event message with a
General Chassis Intrusion offset.
4.3.4.7 Front Panel Lockout
The management controller monitors a ‘Secure Mode’ signal from the keyboard controller on the
baseboard. When the Secure Mode signal is asserted, the management controller locks out the
ability to power down or reset the system using the power or reset push buttons, respectively.
Secure Mode does not block the ability to initiate a sleep request using the Sleep push-button.
The management controller generates a ‘Secure Mode Violation Attempt’ event message if an
attempt it made to power-down or reset the system using the push buttons while Secure Mode
is active.
The set of buttons protected when Secure Mode is active varies depending on the system ACPI
power state and whether the Sahalee BMC or the mBMC is in control as shown in the following
table. Differences are highlighted.
Note: The mBMC will prevent the system from powering up via button press when either secure
mode or the front panel lockout I/O signal is asserted.
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