Dell XC Core XC760 Installation And Service Manual

Table 22. Integrated Devices details (continued)Option Descriptionthe embedded video during POST and preboot environment. The embedded video isdisabled 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 isdiscovered during PCI enumeration is selected as the primary video. You might have torearrange 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 improveperformance on workloads where throughput and latency are critical. The optionsavailable 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 2KCycles.Current State of EmbeddedVideo ControllerDisplays the current state of the embedded video controller. The Current State ofEmbedded Video Controller option is a read-only field. If no add-in graphics card isinstalled, the Embedded Video Controller is automatically used as the primary displayeven 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 youroperating system. When The default value is Enabled, the operating system initializesthe timer. When The default value is Disabled (the default), the timer does not affectsystem.Empty Slot Unhide Enables or disables the root ports of all the empty slots that are accessible to the BIOSand operating system. The default value is Disabled.Memory Mapped I/O above 4GBEnables or disables the support for the PCIe devices that need large amounts ofmemory. Enable this option only for 64-bit operating systems. The default value isEnabled.Memory Mapped I/O Base When set to 12 TB , the system maps the MMIO base to 12 TB. Enable this optionfor 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 formemory 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 yoursystem. The slot disablement feature controls the configuration of the Mezzaninecards that are installed in the specified slot. Slots must be disabled only when theinstalled peripheral card prevents booting into the operating system or causes delaysin system startup. If the slot is disabled, both the Option ROM and UEFI drivers aredisabled. 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 UEFIdriver from the slot do not run during POST. The system does not boot from thecard and its preboot services are not available. However, the card is available to theoperating system.Slot n: Enables or disables or only the boot driver is disabled for the PCIe slot n. Thedefault value is Enabled.Serial communicationsIn the BIOS, access Serial Communication to view details.About this taskThe serial port is optional for the Dell XC Core XC760. The Serial Communication option is applicable only if the serial COM portis installed in the system.34 Pre-operating system management applications