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ADDDC (Adaptive Double Device Data Correction) Sparing
Select Enable for Adaptive Double Device Data Correction (ADDDC) support, which
will not only provide memory error checking and correction but will also prevent the
system from issuing a performance penalty before a device fails. Please note that virtual
lockstep mode will only start to work for ADDDC after a faulty DRAM module is spared.
The options are Enable* and Disable. (The option "Enable" can be set as default when
it is supported by the motherboard.)
Patrol Scrub
Patrol Scrubbing is a process that allows the CPU to correct correctable memory errors
detected in a memory module and send the corrections to the requestor (the original
source). When this item is set to Enable, the IO hub will read and write back one cache line
every 16K cycles if there is no delay caused by internal processing. By using this method,
roughly 64 GB of memory behind the IO hub will be scrubbed every day. The options are
Enable and Disable.
Patrol Scrub Interval
Use this item to specify the number of hours (between 0 to 24) required for the system to
complete a full patrol scrubbing. Enter 0 for patrol scrubbing to be performed automatically.
The default setting is 24.
Note: This item is hidden when Patrol Scrub item is set to Disable.
IIO Configuration
EV DFX (Device Function On-Hide) Features
When this feature is set to Enable, the EV_DFX Lock Bits that are located in a processor
will always remain clear during electric tuning. The options are Disable and Enable.
CPU1 Configuration/CPU2 Configuration
IOU0 (IIO PCIe Br1)
This feature configures the PCI-E Bifuraction setting for a PCI-E port specified by the user.
The options are x4x4x4x4, x4x4x8, x8x4x4, x8x8, x16, and Auto.
IOU1 (IIO PCIe Br2)
This feature configures the PCI-E Bifuraction setting for a PCI-E port specified by the user.
The options are x4x4x4x4, x4x4x8, x8x4x4, x8x8, x16, and Auto.
IOU2 (IIO PCIe Br3)
This feature configures the PCI-E Bifuraction setting for a PCI-E port specified by the user.
The options are x4x4x4x4, x4x4x8, x8x4x4, x8x8, x16, and Auto.
MCP0 (IIO PCIe Br4)
This feature configures the PCI-E Bifuraction setting for a PCI-E port specified by the user.
The options are x16 and Auto.
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Chapter 6: UEFI BIOS
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