Bull NovaScale R422-E1, Installation And User Manual

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Chapter 7: BIOS
7-11
X
Intel VT for Directed I/O <VT-d>
Select Enabled to bring up the following Intel VT for Directed I/O (VT-d) Confi guration
submenu. The options are Enabled and Disabled .
VT-d for Port 0 (ESI)/VT-d for Port 1/VT-d for Port 5/VT-d for Port
9/VT-d for DMI Port
Select Enabled to enable VT-d support for the port specifi ed through DRHD
Structures in the ACPI Tables. The options are Disabled and Enabled .
4GB PCI Hole Granularity
This feature allows you to select the granularity of PCI hole for PCI slots. If MTRRs
are not enough, this option may be used to reduce MTRR occupation. The options
are: 256 MB , 512 MB, 1GB and 2GB.
Memory Branch Mode
This option determines how the two memory branches operate. System address
space can either be interleaved between the two branches or Sequential from
one branch to another. Mirror mode allows data correction by maintaining two
copies of data in two branches. Single Channel 0 allows a single DIMM population
during system manufacturing. The options are Interleave , Sequential, Mirroring,
and Single Channel 0.
Branch 0 Rank Interleaving/Branch 1 Rank Interleaving
Select enable to enable Interleaved Memory for Memory Bus Branch 0 Rank or
Branch 1 Rank. The options for Memory Interleaving are 1:1, 2:1 and 4:1 .
Branch 0 Rank Sparing/Branch 1 Rank Sparing
Select Enable to enable the function of memory sparing for Memory Bus Branch
0 or Branch 1. The options are Enabled and Disabled .
Enhanced x8 Detection
Select Enabled to enable Enhanced x8 DRAM UC Error Detection. The options
are Disabled and Enabled .
Demand Scrub
Scrubbing is a process that allows the North Bridge to correct correctable memory
errors found on an FBD memory module. When the CPU or I/O issues a demand-
read command, and the read data from memory turns out to be a correctable ECC,
it is corrected and sent to the original source. Memory is updated as well. Select
Enabled to use Demand Scrubbing for ECC memory correction. The options are
Enabled and Disabled.