Dell XC Core XC760

Table 22. Integrated Devices details(continued)
Option Description
the embedded video during POST and preboot environment. The embedded video is
disabled right before the operating system boots. The default value is Enabled.
When multiple add-in graphic cards are installed in the system, the first card that is
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.
I/O Snoop HoldOff Response 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. The default value is 2K
Cycles.
Current State of Embedded
Video Controller
Displays the current state of the embedded video controller. The Current State of
Embedded Video Controller option is a read-only field. If no add-in graphics card is
installed, the Embedded Video Controller is automatically used as the primary display
even if the Embedded Video Controller setting is set to Disabled.
SR-IOV Global Enable Enables or disables the BIOS configuration of Single Root I/O Virtualization (SR-
IOV) devices. The default value is Disabled.
OS Watchdog Timer If your system stops responding, this watchdog timer aids in the recovery of your
operating system. When The default value is Enabled, the operating system initializes
the timer. When The default value is Disabled (the default), the timer does not affect
system.
Empty Slot Unhide Enables or disables the root ports of all the empty slots that are accessible to the BIOS
and operating system. The default value is Disabled.
Memory Mapped I/O above 4
GB
Enables or disables the support for the PCIe devices that need large amounts of
memory. Enable this option only for 64-bit operating systems. The default value is
Enabled.
Memory Mapped I/O Base When set to 12 TB , the system maps the MMIO base to 12 TB. Enable this option
for an operating system that requires 44-bit PCIe addressing. When set to 512 GB ,
the system maps the MMIO base to 512 GB, and reduces the maximum support for
memory to less than 512 GB. Enable this option only for the four GPU DGMA issue.
The default value is 56 TB.
Mezzanine Slot Disablement Enables or disables or boot driver disables the available mezzanine slots on your
system. The slot disablement feature controls the configuration of the Mezzanine
cards that are 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 mezzanine slots that are present on the system are available for control.
When The default value is boot driver disabled, both the Option ROM and UEFI
driver from the slot do not run during POST. The system does not boot from the
card and its preboot services are not 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. The
default value is Enabled.
Serial communications
In the BIOS, access Serial Communication to view details.
About this task
The serial port is optional for the Dell XC Core XC760. The Serial Communication option is applicable only if the serial COM port
is installed in the system.
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Pre-operating system management applications