Dell EMC PowerEdge T640 - Page 52

Option Description
in video and the embedded video during POST and pre-boot environment. The embedded video is disabled 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 rst card discovered
during PCI enumeration is selected as the primary video. You might have to re-arrange the cards in the
slots in order to control which card is the primary video.
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 eld. 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 Enabled.
SR-IOV Global
Enable
Enables or disables the BIOS conguration of Single Root I/O Virtualization (SR-IOV) devices. This option is set to
Enabled by default.
OS Watchdog
Timer
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 Enabled(the default),
the timer does not have any eect on the system.
Empty Slot Unhide Enables or disables the root ports of all the empty slots that are accessible to the BIOS and OS. This option is set
to Disabled by default.
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. This option is set to Enabled by default.
Memory Mapped
I/O Base
When set to 12 TB, the system maps the MMIO base to 12 TB. Enable this option for an OS 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 4 GPU DGMA issue. This option is set to
56 TB by default.
Slot Disablement Enables or disables the available PCIe slots on your system. The slot disablement feature controls the conguration
of the PCIe cards installed in the specied 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 are available for control.
Slot Bifurcation Allows Platform Default Bifurcation, Auto Discovery of Bifurcation and Manual Bifurcation Control. The default
is set to Platform Default Bifurcation. The slot bifurcation eld is accessible when set to Manual Bifurcation
Control and is disabled when set to Platform Default Bifurcation or Auto Discovery of Bifurcation.
Table 29. Slot Bifurcation
Option Description
Slot 1 Bifurcation
x16, x4, x8, x4 x4 x8 or x8 x4 x4 Bifurcation
Slot 2 Bifurcation
x4 (Display only)
Slot 3 Bifurcation
x16, x4, x8, x4 x4 x8 or x8 x4 x4 Bifurcation
Slot 4 Bifurcation
x4 or x8 Bifurcation
Slot 5 Bifurcation
x4 (Display only)
Slot 6 Bifurcation
x16, x4, x8, x4 x4 x8 or x8 x4 x4 Bifurcation
Slot 7 Bifurcation
x4 or x8 Bifurcation
Slot 8 Bifurcation
x16, x4, x8, x4 x4 x8 or x8 x4 x4 Bifurcation
52 Pre-operating system management applications