Intel® 5000 Series Chipsets Server Board Family Datasheet System Management
Revision 1.1
Intel order number D38960-004
109
Front panel lock-out allows specific front panel buttons to be protected. This protection includes
blocking the buttons and generating violation events if one of the buttons is pressed while the
front panel is in a lock-out state. Support is available only for protecting the front panel power
and reset buttons as a unit. These buttons cannot be individually locked.
The set of buttons that is protected when front panel lock-out mode is active varies, depending
on the system ACPI power state.
Table 38. Secure Mode versus ACPI State
ACPI
State
Power Button Reset Button Diagnostic Interrupt Button
(Front Panel NMI)
ID Button
S0 Protected Protected Unprotected Unprotected
S1 / S3 Unprotected Unprotected Unprotected Unprotected
S4 / S5 Unprotected Unprotected Unprotected Unprotected
4.6 Private Management I
2
C Buses
The BMC controls multiple private I
2
C buses. The BMC is the sole master on these buses.
4.7 Watchdog Timer
The BMC implements a fully IPMI 2.0 compatible, watchdog timer. See the IPMI specifications
for details. The NMI / diagnostic interrupt specified for an IPMI 2.0 watchdog timer is associated
with an NMI on IA-32 platforms. A watchdog pre-timeout SMI (or equivalent signal assertion) is
not supported on platforms that use one of the Intel
®
5000 Series Chipsets.
4.8 System Event Log (SEL)
The BMC implements the logical system event log as specified in the Intelligent Platform
Management Interface Specification, Version 2.0. The SEL is accessible via all communication
transports. This way, out-of-band interfaces can access SEL information while the server is
down.
The BMC allocates 65,536 bytes (64 KB) of non-volatile storage space for storing system
events. Every system log record is padded with an extra four-byte timestamp that indicates
when the record is deleted, making each SEL record 20 bytes in size. This means there can be
up to 3,276 SEL records stored at a time. An attempt to add a SEL record after 3,276 records
are stored results in a failure, and the out of space completion code is returned.
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