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*If the feature above is set to Enable, the five features below are available for
configuration:
Interrupt Remapping
Use this feature to enable Interrupt Remapping support, which detects and controls
external interrupt requests. The options are Enable and Disable.
PassThrough DMA
Use this feature to allow devices such as network cards to access the system memory
without using a processor. Select Enable to use the Non-Isoch VT-d Engine Pass
Through Direct Memory Access (DMA) support. The options are Enable and Disable.
ATS
Use this feature to enable Non-Isoch VT-d Engine Address Translation Services (ATS)
support. ATS translates virtual addresses to physical addresses. The options are En-
able and Disable.
Posted Interrupt
Use this feature to enable VT-d Posted Interrupt. The options are Enable and Disable.
Coherency Support (Non-Isoch)
Use this feature to maintain setting coherency between processors or other devices.
Select Enable for the Non-Isoch VT-d engine to pass through DMA to enhance system
performance. The options are Enable and Disable.
PCIe Completion Timeout Disable
Use this feature to enable PCIe Completion Timeout support for electric tuning. The op-
tions are Yes, No, and Per-Port.
South Bridge Configuration
The following South Bridge information will display:
•
USB Module Version
•
USB Devices
Legacy USB Support
Select Enabled to support onboard legacy USB devices. Select Auto to disable legacy support
if there are no legacy USB devices present. Select Disable to have all USB devices available
for EFI applications only. The options are Enabled, Disabled, and Auto.
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Chapter 4: BIOS
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