Dell EMC PowerEdge R940 Installation And Service Manual page 48

Option Description
iDRAC Direct USB The iDRAC Direct USB port is managed by iDRAC exclusively with no host visibility. This option is set to ON or
Port OFF. When set to OFF, iDRAC does not detect any USB devices installed in this managed port.
Internal USB Port Enables or disables the internal USB port. This option is set to Enabled by default.
Integrated Network Enables or disables the integrated network card (NDC). When set to Disabled, the NDC is not available to the
Card 1 operating system (OS). This option is set to Enable by default.
I/OAT DMA Engine 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.
Embedded Video Enables or disables the use of Embedded Video Controller as the primary display. When set to Enabled, the
Controller 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 will be used as the primary display. BIOS will output displays to both the primary
add-in video and the embedded video during POST and pre-boot environment. The embedded video will then be
disabled right before the operating system boots. This option is set to Enabled by default.
Current State of Displays the current state of the embedded video controller. The Current State of Embedded Video Controller
Embedded Video option is a read-only field. If the Embedded Video Controller is the only display capability in the system (that is, no
Controller 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.
SR-IOV Global Enables or disables the BIOS configuration of Single Root I/O Virtualization (SR-IOV) devices. This option is set to
Enable Disabled by default.
OS Watchdog If your system stops responding, this watchdog timer aids in the recovery of your operating system. When this
Timer 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.
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 When set to 12 TB, the system will map MMIO base to 12 TB. Enable this option for an OS that requires 44 bit
I/O above Base PCIe addressing. When set to 512 GB, the system will map MMIO base to 512 GB, and reduce 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 will be available for control.
Table 36. Slot Disablement
Option
Slot 1
Slot 3
48 Pre-operating system management applications
NOTE: Selecting Only Back Ports On and All Ports Off disables the USB management port and also
restricts access to the iDRAC features.
NOTE: If set to Disabled (OS), the Integrated NICs might still be available for shared network access by
iDRAC.
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.
Description
Enables or disables the PCIe slot 1. This option is set to
Enabled by default.
Enables or disables or only the boot driver is disabled
for the PCIe slot 3. This option is set to Enabled by
default.