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Table 57. Integrated Devices details (continued)
Option
Embedded NIC1 and NIC2
I/OAT DMA Engine
Embedded Video Controller
I/O Snoop HoldOff Response
Current State of Embedded Video
Controller
SR-IOV Global Enable
OS Watchdog Timer
Empty Slot Unhide
Slot Disablement
56
Pre-operating system management applications
Description
Enables or disables the OS interface of the Embedded NIC1 and NIC2
controller. If set to Disabled (OS), the NIC may still be available for shared
network access by the embedded management controller. Configure the
Embedded NIC1 and NIC2 option by using the NIC management utilities of
the system. This option is set to Enabled by default.
Enables or disables the I/O Acceleration Technology (I/OAT) option. I/OAT is
a set of DMA features designed to accelerate network traffic and lower CPU
utilization. Enable only if the hardware and software support the feature. This
option is set to Disabled by default.
Enables or disables the use of Embedded Video Controller as the primary
display. When set to Enabled, the Embedded Video Controller will be the
primary display even if add-in graphic cards are installed. When set to
Disabled, an add-in graphics card is used as the primary display. BIOS will
output displays to both the primary add-in video and the embedded video
during POST and preboot environment. The embedded video will then be
disabled right before the operating system boots. This option is set to Enabled
by default.
NOTE:
When there are multiple add-in graphic cards installed in the
system, the first card discovered during PCI enumeration is selected as
the primary video. You might have to rearrange the cards in the slots in
order to control which card is the primary video.
Selects the number of cycles PCI I/O can withhold snoop requests, from the
CPU, to allow time to complete its own write to LLC. This setting can help
improve performance on workloads where throughput and latency are critical.
The options available are 256 Cycles, 512 Cycles, 1K Cycles, 2K Cycles,
4K Cycles, 8K Cycles, 16K Cycles, 32K Cycles, 64K Cycles and 128K
Cycles.This option is set to 2K Cycles by default.
Displays the current state of the embedded video controller. The Current
State of Embedded Video Controller option is a read-only field. If the
Embedded Video Controller is the only display capability in the system (that
is, no add-in graphics card is installed), then the Embedded Video Controller
is automatically used as the primary display even if the Embedded Video
Controller setting is set to Disabled.
Enables or disables the BIOS configuration of Single Root I/O Virtualization
(SR-IOV) devices. This option is set to Disabled by default.
If your system stops responding, this watchdog timer aids in the recovery
of your operating system. When this option is set to Enabled, the operating
system initializes the timer. When this option is set to Disabled (the default),
the timer does not have any effect on the system.
Enables or disables the root ports of all the empty slots that are accessible to
the BIOS and operating system. This option is set to Disabled by default.
Enables or disables or boot driver disables the available PCIe slots on your
system. The slot disablement feature controls the configuration of the PCIe
cards installed in the specified slot. Slots must be disabled only when the
installed peripheral card prevents booting into the operating system or causes
delays in system startup. If the slot is disabled, both the Option ROM and UEFI
drivers are disabled. Only slots that are present on the system will be available
for control. When this option is set to boot driver disabled, both the Option
ROM and UEFI driver from the slot will not run during POST. The system will
not boot from the card and its pre-boot services will not be available. However,
the card is available to the operating system.
Slot n: Enables or disables or only the boot driver is disabled for the PCIe slot
n. This option is set to Enabled by default.
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