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Chapter 4: UEFI BIOS
PCIe/PCI/PnP Configuration
The following information is displayed:
•
PCI Bus Driver Version
PCI Devices Common Settings:
Above 4G Decoding (Available when the system supports 64-bit PCI decoding)
Select Enabled to decode a PCI device that supports 64-bit in the space above 4G Address.
The options are Disabled and Enabled.
MMCFG Base
This feature determines how the lowest Memory Mapped Configuration (MMCFG) base is
assigned to onboard PCI devices. The options are 1G, 1.5G, 1.75G, 2G, 2.25G, 3G, and Auto.
MMCFG Size
Use this feature to set the MMCFG size. The options are 128M, 256M, 512M, 1G, 2G, and
Auto. Please note that the MMCFG size is based on the memory populated.
MMIO High Base
Use this feature to select the base memory size according to memory-address mapping for
the IO hub. The options are 56T, 40T, 32T, 24T, 16T, 4T, 2T, 1T, 512G, and 3584T.
MMIO High Granularity Size
Use this feature to select the high memory size according to memory-address mapping for
the IO hub. The options are 1G, 4G, 16G, 64G, 256G, and 1024G.
SR-IOV Support
Select Enabled for Single-Root IO Virtualization support. The options are Disabled and
Enabled.
ARI Support
Select Enabled for Alternative Routing-ID Interpretation (ARI) support. The options are
Disabled and Enabled.
Bus Master Enable
If it is set to Enabled, the PCI Bus Driver will enable the Bus Master Attribute for DMA
transactions. If it is set to Disabled, the PCI Bus Driver will disable the Bus Master Attribute
for Pre-Boot DMA protection. The options are Disabled and Enabled.
Consistent Device Name Support
Select Enabled for ACPI_DSM (DSM: Device Specific Method) device name support for
onboard devices and slots. The options are Disabled and Enabled.
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