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System BIOS
Intel® Server Board SE7520AF2 TPS
114
Revision
1.2
Intel order number C77866-003
4 KB I/O
8 MB non-prefetchable memory below 4 GB
32 MB prefetcheable memory below 4 GB
An occupied slot gets only its requested resources.
The direct effect of resource padding is that the total memory allocated by the BIOS to the PCI
subsystem increases and main memory available to the operating system in the 0 to 4GB range
decreases according to the lower bounds of the memory addresses allocated to PCI.
PCI hot plug specifications define a standard usage model for Hot-plug PCI. The usage model
specifies several elements including state indicator LEDs, interlocking switches. The Intel®
Server Board SE7520AF2 has state indicator LEDs, but does not have physical interlocking
switches. This function is performed by the Hot Plug Driver User Interface.
The BIOS provides ACPI hot-plug methods so a PCI adapter can be added, removed, or
replaced without shutting down the system. The hot plug controller follows the Standard Hot-
Plug Controller (SHPC) and Subsystem Specification. The user can use hot add, hot remove or
hot replace PCI cards via the PCI hot plug driver user interface.
The hardware provides green and amber lights to indicate the status of each PCI slot. The
green light indicates that power is applied to that PCI slot. Adapters must not be added or
removed from a slot while the green light is on. The amber light is an attention indicator. When
the amber light is on, the system has detected a power fault or other error condition on that slot.
The ACPI hot plug methods check the frequency and PCI/PCI-X capabilities of the adapter. The
ACPI hot plug methods do not allow less capable adapters to be connected to a bus segment
that is currently operating in a more capable mode. In this situation, the ACPI methods turn off
power to the adapter, turn on the amber light, and notify the operating system of a device
malfunction.
The Intel® Server Board SE7520AF2 provides support for PCI Hot-Plug via the prescribed ACPI
mechanism, through the use of SCIs and associated control methods via the PCI hot plug driver
and GUI for insertion/removal/hot add request events.
The hot-plug feature supports several scenarios:
Hot Replace: the user can replace a PCI card with an identical card. The replacement
card uses the same PCI resources assigned to the previous card. The operating system
driver is not updated.
Hot Remove: the user can remove the existing PCI card without installing a replacement.
Hot Add: the user can add a new, previously uninstalled adapter card into an empty slot.
5.5.8.3
Operating System Interfaces
5.5.8.3.1
ACPI Control Methods
ACPI control methods require an ACPI hot plug aware operating system. The BIOS-provided
ACPI methods support the PCI hot plug driver and GUI.