Dell PowerEdge T640 EMC PowerEdge T640 Installation and Service Manual - Page 53

Option, Description, Table 30. Slot Bifurcation

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Option Description 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 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 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 Enabled. SR-IOV Global Enable Enables or disables the BIOS configuration of Single Root I/O Virtualization (SR-IOV) devices. This option is set to Disabled 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 Disabled (the default), the timer does not have any effect 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 Enables or disables the support for the PCIe devices that need large amounts of memory. Enable this option only I/O above 4 GB 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 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 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 field is accessible when set to Manual Bifurcation Control and is disabled when set to Platform Default Bifurcation or Auto Discovery of Bifurcation. Table 30. Slot Bifurcation Option Slot 1 Bifurcation Description 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 Pre-operating system management applications 53

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Option
Description
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 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 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
Enabled
.
SR-IOV Global
Enable
Enables or disables the BIOS configuration of Single Root I/O Virtualization (SR-IOV) devices. This option is set to
Disabled
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
Disabled
(the
default), the timer does not have any effect 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
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 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 field is accessible when set to
Manual
Bifurcation Control
and is disabled when set to
Platform Default Bifurcation
or
Auto Discovery of
Bifurcation
.
Table 30. 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
Pre-operating system management applications
53