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Chapter 6: UEFI BIOS
MMIO High Base
Use this item to select the base memory size according to memory-address mapping for the
IO hub. The options are 56 TB, 40 TB, 24 TB, 3 TB, 2 TB, and 1 TB.
MMIO High Granularity Size
Use this item to select the high memory size according to memory-address mapping for the
IO hub. The options are 256 GB, 128 GB, 512 GB, and 1024 GB.
Maximum Read Request
Select Auto for the system BIOS to automatically set the maximum size for a read request
for a PCI-E device to enhance system performance. The options are Auto, 128 Bytes, 256
Bytes, 512 Bytes, 1024 Bytes, 2048 Bytes, and 4096 Bytes.
MMCFG Base
Use this item to select the low base address for PCIE adapters to increase base memory.
The options are 1G, 1.5G, 1.75G, 2G, 2.25G. and 3G.
NVMe Firmware Source
This feature determines the lowest MMCFG (Memory-Mapped Configuration) base assigned
to PCI devices. The options are Vendor Defined Firmware and AMI Native Support.
VGA Priority
Use this item to select the graphics device to be used as the primary video display for system
boot. The options are Onboard Offboard, and Auto.
PCH SLOT 2 PCI-E 3.0 x4 OPROM
Select The options are Disabled, Legacy, and EFI.
PCH SLOT 3 PCI-E 3.0 x4 OPROM
Select Disabled to deactivate the selected slot. Select Legacy to enable the slot for use of
legacy devices. The options are Disabled, Legacy, and EFI.
Bus Master Enable
This feature enables a device connected to the bus to initiate Direct Memory Access (DMA)
transactions. When Disabled is selected, the PCI Bus Driver disables Bus Master Attribute
for Pre-Boot DMA Protection. When Enabled is slected, the PCI Bus Driver enables Bus
Master Attribute for DMA transactions. Some devices request Bus Master to be enabled for
operations. The options are Disabled and Enabled.
Onboard LAN Device
This feature allows the user to Enable or Disable Onboard LAN devices. The options are
Auto, Enabled, and Disabled.
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