Biostar A55MD2 User manual

A55MD2 / A55MG2 / A55ML2 UEFI BIOS Manual
i
UEFI BIOS Setup ........................................................................... 1
1 Main Menu................................................................................... 3
2 Advanced Menu.......................................................................... 4
3 Chipset Menu............................................................................ 15
4 Boot Menu................................................................................. 20
5 Security Menu........................................................................... 23
6 Performance Menu................................................................... 24
7 Exit Menu .................................................................................. 30

A55MD2 / A55MG2 / A55ML2 UEFI BIOS Manual
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UEFI BIOS Setup
Introduction
The purpose of this manual is to describe the settings in the AMI UEFI BIOS
Setup program on this motherboard. The Setup program allows users to
modify the basic system configuration and save these settings to NVRAM.
UEFI BIOS determines what a computer can do without accessing programs
from a disk. This system controls most of the input and output devices such
as keyboard, mouse, serial ports and disk drives. BIOS activates at the first
stage of the booting process, loading and executing the operating system.
Some additional features, such as virus and password protection or chipset
fine-tuning options are also included in UEFI BIOS.
The rest of this manual will to guide you through the options and settings in
UEFI BIOS Setup.
Plug and Play Support
This AMI UEFI BIOS supports the Plug and Play Version 1.0A specification.
EPA Green PC Support
This AMI UEFI BIOS supports Version 1.03 of the EPA Green PC
specification.
ACPI Support
AMI ACPI UEFI BIOS support Version 1.0/2.0 of Advanced Configuration
and Power interface specification (ACPI). It provides ASL code for power
management and device configuration capabilities as defined in the ACPI
specification, developed by Microsoft, Intel and Toshiba.
PCI Bus Support
This AMI UEFI BIOS also supports Version 2.3 of the Intel PCI (Peripheral
Component Interconnect) local bus specification.
DRAM Support
DDR3 SDRAM (Double Data Rate III Synchronous DRAM) is supported.

A55MD2 / A55MG2 / A55ML2 UEFI BIOS Manual
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Supported CPUs
This AMI UEFI BIOS supports the latest
CPU.
Using Setup
When starting up the computer, press <Del>
during the Power-On Self-Test (POST) to
enter the UEFI BIOS setup utility.
In the UEFI BIOS setup utility, you will see
General Help description at the top right
corner, and this is providing a brief
description of the selected item. Navigation
Keys for that particular menu are at the
bottom right corner, and you can use these
keys to select item and change the settings.
Notice
The default UEFI BIOS settings apply for most conditions to ensure
optimum performance of the motherboard. If the system becomes
unstable after changing any settings, please load the default settings to
ensure system’s compatibility and stability. Use Load Setup Default
under the Exit Menu.
For better system performance, the UEFI BIOS firmware is being
continuously updated. The UEFI BIOS information described in this
manual is for your reference only. The actual UEFI BIOS information
and settings on board may be slightly different from this manual.
The content of this manual is subject to be changed without notice. We
will not be responsible for any mistakes found in this user’s manual and
any system damage that may be caused by wrong-settings.

A55MD2 / A55MG2 / A55ML2 UEFI BIOS Manual
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1 Main Menu
Once you enter AMI UEFI BIOS Setup Utility, the Main Menu will appear on
the screen providing an overview of the basic system information.
BIOS Information
It shows system information including UEFI BIOS version, Project Code,
Model Name, Build Date and etc.
Total Memory
Shows system memory size, VGA shard memory will be excluded.
System Language
Choose the system default language.
System Date
Set the system date. Note that the ‘Day’ automatically changes when you set
the date.
System Time
Set the system internal clock.

A55MD2 / A55MG2 / A55ML2 UEFI BIOS Manual
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2 Advanced Menu
The Advanced Menu allows you to configure the settings of CPU, Super I/O,
Power Management, and other system devices.
Notice
Beware of that setting inappropriate values in items of this menu may cause
system to malfunction.
PCI Subsystem Settings

A55MD2 / A55MG2 / A55ML2 UEFI BIOS Manual
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PCI Latency Timer
This item sets the value to be programmed into PCI Latency Timer Register.
Options: 32 PCI Bus Clocks (Default) / 64 PCI Bus Clocks / 96 PCI Bus
Clocks / 128 PCI Bus Clocks / 160 PCI Bus Clocks / 192 PCI Bus
Clocks / 224 PCI Bus Clocks / 248 PCI Bus Clocks
VGA Palette Snoop
This item enables or disables VGA Palette Registers Snooping.
Options: Disabled (Default) / Enabled
PCI Express Settings
No Snoop
This item enables or disables PCI Express Device No Snoop option.
Options: Enabled (Default) / Disabled
Maximum Payload
This item sets Maximum Payload of PCI Express Device or allows System
BIOS to select the value.
Options: Auto (Default) / 128 Bytes / 256 Bytes / 512 Bytes / 1024 Bytes /
2048 Bytes / 4096 Bytes
Maximum Read Request
This item sets Maximum Read Request Size of PCI Express Device or allows
System BIOS to select the value.
Options: Auto (Default) / 128 Bytes / 256 Bytes / 512 Bytes / 1024 Bytes /
2048 Bytes / 4096 Bytes
ASPM Support
This item sets the ASPM Level: Force LO – Force all links to LO State;
Auto – BIOS auto configures; Disabled – Disables ASPM.
Options: Disabled (Default) / Auto / Force L0s

A55MD2 / A55MG2 / A55ML2 UEFI BIOS Manual
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ACPI Settings/ WakeUp Event control
EuP Control
When EuP is enabled, the system will meet EuP requirement. All wake up
events do not work except Power Button after power down system (S5).
Options: Disabled (Default) / Enabled
PME Wake up from S5
The item enables the system to wake from S5 using PME event.
Options: Disabled (Default) / Enabled
Wake system with Fixed Time
This item enables or disables the system to wake on by alarm event. When
this item is enabled, the system will wake on the hr::min::sec specified.
Options: Disabled (Default) / Enabled
Wake up date
You can choose which date the system will boot up.
Wake up hour / Wake up minute / Wake up second
You can choose the system boot up time, input hour, minute and
second to specify.
Ring-In Wake up from S5
This item enables the system to wake from S5 using Ring-In event.
Options: Disabled (Default) / Enabled

A55MD2 / A55MG2 / A55ML2 UEFI BIOS Manual
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CPU Configuration
This item shows CPU Information
Power Now
This item allows you to enable or disable the PowerNow power saving
technology.
Options: Enabled (Default) / Disabled
NX Mode
This item allows you to enable or disable No-execute page protection
Function
Options: Enabled (Default) / Disabled
SVM
This item allows you to enable AMD virtualization in CPU.
Options: Enabled (Default) / Disabled
CPB Mode
This item allows you to enable or disable CPB.
Options: Auto (Default) / Disabled
C6 Mode
This item allows you to enable or disable C6.
Options: Enabled (Default) / Disabled

A55MD2 / A55MG2 / A55ML2 UEFI BIOS Manual
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Core Leveling
Change the number of compute unit in the system
Options: Auto (Default) / Manual
Note: The following items appear only when you set the Core Leveling item to
[Manual]
Compute Unit0/1
The item allows you to enable or disable CPU Computer Unit0/1.
Options: Enabled (Default) / Disabled
HTC temperature limit
This item allows you to set HTC temperature limit. Range: 70℃- 85℃
Options: 70℃(Default)
SATA Configuration
The BIOS will automatically detect the presence of SATA devices. There is a
sub-menu for each SATA device. Select a device and press <Enter> to enter
the sub-menu for detailed options.
OnChip SATA Channel
This item allows you to enable or disable OnChip SATA Channel
Options: Enabled (Default) / Disabled
OnChip SATA Type
This item allows you to set OnChip SATA type.
Options: Native IDE (Default) / RAID / AHCI / Legacy IDE

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USB Configuration
Legacy USB Support
This item determines if the BIOS should provide legacy support for USB
devices like the keyboard, mouse, and USB drive. This is a useful feature
when using such USB devices with operating systems that do not natively
support USB (e.g. Microsoft DOS or Windows NT).
Options: Enabled (Default) / Disabled / Auto
EHCI Hand-Off
This is a workaround for OSes without EHCI hand-off support. The EHCI
ownership change should be claimed by EHCI driver.
Options: Disabled (Default) / Enabled