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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
Use this feature to enable PCI-E Native Hot Plug/Power Management Events controls. The
options are Disabled and Enabled.
Native ASPM
Use this feature to select which system will control the Active State Power Management
(ASPM). Select Eanbled for OS-controlled ASPM. Select Disabled for BIOS-controlled ASPM.
The options are Auto, Enabled, and Disabled.
Numa
This setting enables or disables Non-Uniform Memory Access (NUMA), a feature that im-
proves memory-to-processor communication and performance. The options are Disabled
and Enabled.
Super IO Configuration
The following Super IO information will display:
•
Super IO Chip AST2500
Serial Port 1 Configuration
This submenu allows the user to configure the settings of Serial Port 1.
Serial Port 1
Select Enabled to enable the selected onboard serial port. The options are Disabled and
Enabled.
Device Settings
This feature displays the status of a serial part specified by the user.
Change Settings
This feature specifies the base I/O port address and the Interrupt Request address of a
serial port specified by the user. Select Auto to allow the BIOS to automatically assign the
base I/O and IRQ address. The options for Serial Port 1 are Auto, (IO=3F8h; IRQ=4;),
(IO=2F8h; IRQ=4;), (IO=3E8h; IRQ=4;), and (IO=2E8h; IRQ=4;).
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Chapter 4: UEFI BIOS
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