Dell PowerEdge T550 EMC BIOS and UEFI Reference Guide - Page 15

Table 16. Integrated Devices details (continued) Option Description 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 Disabled. 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 operating system. 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 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 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. Slot n: Enables or disables or only the boot driver is disabled for the PCIe slot n. This option is set to Enabled by default. Slot Bifurcation Auto Discovery Bifurcation Settings allows Platform Default Bifurcation, and Manual bifurcation Control. This option is set to Platform Default Bifurcation by default. The slot bifurcation field is accessible when set to Manual bifurcation Control and is grayed out when set to Platform Default Bifurcation. NOTE: The slot bifurcation supports on PCIe slot only, does not support slot type from Paddle card to Riser and Slimline connector to Riser. Serial Communication To view the Serial Communication screen, power on the system, press F2, and click System Setup Main Menu > System BIOS > Serial Communication. NOTE: The serial port is optional for the PowerEdge T550 system. The Serial Communication option is applicable only if the serial COM port is installed in the system. Table 17. Serial Communication details Option Description Serial Communication Enables the serial communication options. Selects serial communication devices (Serial Device 1 and Serial Device 2) in BIOS. BIOS console redirection can also be enabled, and the port address can be specified. The options available for System without serial COM port (DB9) are On without Console Redirection, On with Console Redirection, Off. This option is set to Off by default. Pre-operating system management applications 15