Chapter 6: BIOS
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High Precision Event Timer
Select Enabled to activate the High Precision Event Timer (HPET) that produces periodic
interrupts at a much higher frequency than a Real-time Clock (RTC) does in synchronizing
multimedia streams, providing smooth playback and reducing the dependency on other
timestamp calculation devices, such as an x86 RDTSC Instruction embedded in the CPU.
The High Performance Event Timer is used to replace the 8254 Programmable Interval Timer.
The options are Disabled and
Enabled
.
Native PCIE Enable
Enable this feature to grant native control of hot plug, Power Management Events, PCI-E
Advanced Error Reporting, PCI-E Capability Structure Control, and Latency Tolerance
Reporting Control. The options are Disabled and
Enabled
.
Native ASPM
Select Enabled for the operating system to control the Active State Power Management
(ASPM). Select Disabled for the BIOS to control the ASPM. The options are
Auto
, Enabled,
and Disabled.
USB Configuration
The following USB items will be displayed:
•
USB Module Version
•
USB Controllers
•
USB Devices
Legacy USB Support (Available when USB Functions are not Disabled)
Select Enabled to support legacy USB devices. Select Auto to disable legacy support if
USB devices are not present. Select Disabled to have USB devices available for Extensive
Firmware Interface (EFI) applications only. The settings are
Enabled
, Disabled, and Auto.
XHCI Hand-off
This feature is for operating systems that do not support eXtensible Host Controller Interface
(XHCI) hand-off. When this feature is enabled, XHCI ownership change will be claimed by
the XHCI driver. The settings are
Enabled
and Disabled.
USB Mass Storage Driver Support
Select Enabled for USB mass storage device support. The options are Disabled and
Enabled
.
Port 60/64 Emulation
Select Enabled for I/O port 60h/64h emulation support which will provide complete USB
keyboard legacy support for the operating system that does not support Legacy USB devices.
The options are Disabled and
Enabled
.
