Filter
Top Products
Intel
®
NetStructure™ MPCHC5525 System Master Processor Board IPMI Reference Driver User’s Guide 21
Preparing Software for IPMI Usage
3.4.2 Checking CPU Board Signals
The IBMU is equipped with several discrete sensors used to check the assertion or deassertion of
CPU board signals. After an assertion or deassertion of such a signal, the IPMI controller generates
event messages. For further information on event messages, refer to tables 17-5 and 19-1 of the
IPMI Specification 1.0.
Set as PM, the IPMI controller sends these messages to the BMC in the system. The BMC saves
the messages in the SEL and in the event message buffer.
Note: In comparison to the event message buffer, the SEL keeps all events, even if the IPMI controller is
turned off. Therefore, read the events from the SEL with the IPMI command “Get SEL Entry” and
not from the event message buffer.
Set as BMC, the IPMI controller simply saves the event messages in the SEL and in the event
message buffer.
The following subsections describe the discrete sensors that generate event mes-
sages which can be read by the system management software.
Note: Usually the sensor type is used to find out which sensor has sent an event and which signals were
asserted. Since all sensors checking the CPU board signals are of the same sensor type, you have to
use the sensor number to distinguish between the sensors.
3.4.2.1 Critical IRQ Status
This sensor reads the following signals which have IRQ capability:
• PCI_RESET
If asserted, signals that all devices attached to PCI buses are reset.
• NMI
• SMI
• IPMB1_ALERT
If asserted, signals that a sensor on IPMB1 has reached a critical status.
3.4.2.2 CPCI Signal
This sensor reads two PCI-relevant signals, CPCI_ENUM and CPCI_BD_SEL. CPCI_ENUM is
asserted, if a board is about to be removed from the system. CPCI_BD_SEL is asserted, if a board
was fully plugged into the system and is running.
3.4.2.3 Ejector Switch
This sensor reads the LOCAL_ENUM signal. It is asserted when the lower front panel handle on
the board containing the IPMI module was opened.