
Intel® Workstation Board S5520SC TPS Functional Architecture
Revision 1.7
Intel order number: E39530-010
53
3.16 ACPI Support
The Intel
®
Workstation Board supports S0, S1, S3, and S5 states. S1 is considered a sleep
state.
The wake-up sources are enabled by the ACPI operating systems with cooperation from the
drivers; the BIOS has no direct control over the wake-up sources when an ACPI operating
system is loaded. The role of the BIOS is limited to describing the wake-up sources to the
operating system.
The S5 state is equivalent to the operating system shutdown. No system context is saved when
going into S5.
3.17 Intel
®
Virtualization Technology
Intel
®
Virtualization Technology is designed to support multiple software environments sharing
same hardware resources. Each software environment may consist of an operating system and
applications. You can enable or disable the Intel
®
Virtualization Technology in the BIOS Setup.
The default behavior is disabled.
Note: After changing the Intel
®
Virtualization Technology option (disable or enable) in the BIOS
setup, users must perform an AC power cycle before the change takes effect.
3.17.1 Intel
®
Virtualization Technology for Directed IO (VT-d)
The Intel
®
Workstation Board S5520SC supports DMA remapping from inbound PCI Express*
memory Guest Physical Address (GPA) to Host Physical Address (HPA). PCI devices are
directly assigned to a virtual machine leading to a robust and efficient virtualization.
You can enable or disable the Intel
®
Virtualization Technology for Directed I/O in the BIOS
Setup. The default behavior is disabled.
Note: After changing the Intel
®
Virtualization Technology for Directed I/O options (disable or
enable) in the BIOS setup, users must perform an AC power cycle before the changes take
effect.
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