Dell EMC PowerEdge C6420 Manual page 49

Option Description
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 29. Slot Disablement
Option
Slot 1
Slot 3
Slot 4
Slot 5
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 grayed out when set to Platform Default Bifurcation or Auto discovery of Bifurcation.
Table 30. Slot Bifurcation
Option
Slot 1 Bifurcation
Slot 3 Bifurcation
Slot 4 Bifurcation
Slot 5 Bifurcation
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.
Enables or disables or only the boot driver is disabled
for the PCIe slot 4. This option is set to Enabled by
default.
Enables or disables or only the boot driver is disabled
for the PCIe slot 5. This option is set to Enabled by
default.
Description
X4 or X8 or X4X4X4X8 or X8X4X4 Bifurcation
X4 or X8 or X4X4X4X8 or X8X4X4 Bifurcation
X16 or X4 or X8 or X4X4X4X8 or X8X4X4 Bifurcation
X4 Bifurcation or X8 Bifurcation
Pre-operating system management applications 49