Biostar G31-M4 User manual

G31-M4 BIOS Manual
i
BIOS Setup ................................................................................................ 1
1 Main Menu ............................................................................................. 3
2 Advanced Menu...................................................................................... 7
3 PCIPnP Menu....................................................................................... 16
4 Boot Menu............................................................................................. 20
5 Chipset Menu ....................................................................................... 23
6 Performance Menu .............................................................................. 27
7 Exit Menu ............................................................................................. 29

G31-M4 BIOS Manual
1
BIOS Setup
Introduction
The purpose of this manual is to describe the settings in the AMI BIOS Setup
program on this motherboard. The Setup program allows users to modify the basic
system configuration and save these settings to CMOS RAM. The power of CMOS
RAM is supplied by a battery so that it retains the Setup information when the power
is turned o f f.
Basic Input-Output System (BIOS) determines what a computer can do without
accessing programs from a disk. This system controls most of the input and output
devices s uch as keyboard, mous e, serial ports and dis k 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 BIOS.
The rest of this manual will to guide yo u through the options and s ettings in BIOS
Setup.
Plug and Play Support
This AMI BIOS supports the Plug and Play Version 1.0A specification.
EPA Green PC Support
This AMI BIOS supports Version 1.03 of the EPA Green PC specification.
APM Support
This AMI BIOS s upports Version 1.1&1.2 of the Advanced Po wer Management
(APM) specific atio n. Power management features are implemented via the Sys tem
Management Interrupt (SMI). Sleep and Suspend power management modes are
supported. Power to the hard disk drives and video monitors can also be managed by
this AMI BIOS.
ACPI Support
AMI ACPI 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.

G31-M4 BIOS Manual
2
PCI Bus Support
This AMI BIOS also s upports Version 2.3 of the Intel PCI (Peripheral Component
Interconnect) loca l bus spec ific ation.
DRAM Support
DDR2 SDRAM (Double Data Rate II Synchronous DRAM) is supported.
Supported CPUs
This AMI BIOS supports the AMD CPU.
Using Setup
When starting up the computer, press
<Del> during the Power-On Self-Test
(POST) to enter the BIOS setup utility.
In the 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 thes e keys to select item and c hange
the settings.
Notice
zThe default 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 s ettings to ensure system’s compatibility and stability. Use
Load Setup Default under the Exit Menu.
zFor better system p erformance, the BIOS firmware is b eing continuous ly updated.
The BIOS information described in this manual is for your reference only. The actual
BIOS information and settings on board may be slightly different from this manual.
zThe content of this manual is subject to be changed without notice. We will not be
responsib le for any mistakes found in this user’s manual and any system damage that
may b e caused by wro ng-s ettings.
General Help
Navigation Keys

G31-M4 BIOS Manual
3
1 Main Menu
Once you enter AMI BIOS Setup Utility, the Main Menu will appear on the screen
providing an overview of the basic system information.
BIOS SETUP UTILITY
Main Advanced PCIPnP Boot Chipset Performance
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Field
Select Field
General Help
Save and Exit
Exit
+-
Tab
F1
F10
ESC
Use [ENTER], [TAB]
or [SHIFT-TAB] to
select a field.
Use [+] or [-] to
configure system Time.
System Overview
AMI BIOS
System Memory
[ :00:00]
System Date [Fri 01/01/2010]
Floppy A
> IDE/SATA Configuration
Version :01.01.01
Build Date:01/01/10
Size :
System Time 00
Exit
AMI BIOS
Shows system information including BIOS version and built date.
System Memory
Shows system memory size, VGA s hard memory will be excluded..
System Time
Set the s ystem internal clock.
System Date
Set the system date. Note that the ‘Day’ automatically changes when you set the
date.
Floppy A
Select the type of floppy disk drive installed in your system.
Options: 360K, 5. 25 in / 1.2M, 5.25 in / 720K, 3. 5 in / 1.44M, 3.5 in /
2.88M, 3.5 in / None

G31-M4 BIOS Manual
4
IDE/SATA Configuration
The BIOS will automatically d etect the presence o f IDE/S ATA devices. There is a
sub-menu for each IDE/SATA device. Select a device and press <Enter> to enter
the sub-menu of detailed options.
BIOS SETUP UTILITY
Main
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Go to Sub Screen
General Help
Save and Exit
Exit
Enter
F1
F10
ESC
IDE/SATA Confuguration
Configure SATA Channels [Before PATA]
> SATA1 Device
>
Hard Disk Write Protect [Disabled]
IDE Detect Time Out (Sec) [35]
SATA2 Device
> SATA3 Device
> SATA4 Device
> IDE Channel 1 Master
> IDE Channel 1 Slave
ATA/IDE Configuration [Enhanced]
Options
Disabled
Compatible
Enhanced
ATA/IDE Configuration
This item allows you to control the onboard IDE controller.
Options: Enhanced (Default) / Compatible / Disabled
Configure SATA Channels
This item allows you to control the SATA channel configuration sequence.
Options: Before PATA (Default) / Behind PATA

G31-M4 BIOS Manual
5
SATA1/2/3/4 Device; IDE Channel 1 Master/Slave
BIOS SETUP UTILITY
Main
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Select the type
of device connected
to the system.
SATA1 Device
LBA/Large Mode [Auto]
Block (Multi-Sector Transfer)[Auto]
PIO Mode [Auto]
DMA Mode [Auto]
S.M.A.R.T [Auto]
32Bit Data Transfer [Enabled]
Device :
Type [Auto]
The BIOS detects the information and values of respective d evic es, and these
informatio n and values are s ho wn below to the name of the sub -menu.
Type
Select the type of the IDE/SATA drive.
Options: Auto (Default) / CDROM / ARMD / Not Installed
LBA/Large Mode
Enable or disable the LBA mode.
Options: Auto (Default) / Disabled
Block (Multi-Sector Transfer)
Enable or disable multi-sector transfer.
Options: Auto (Default) / Disabled
PIO Mode
Select the PIO mode.
Options: Auto (Default) / 0 / 1 / 2 / 3 / 4
DMA Mode
Select the DMA mode.
Options: Auto (Default) / SWDMA0 ~ 2 / MWDMA0 ~ 2 / UDMA0 ~ 5

G31-M4 BIOS Manual
6
S.M.A.R.T
Set the Smart Monitoring, Analysis, and Reporting Technology.
Options: Auto (Default) / Disabled / Enabled
32Bit Data Transfer
Enable or disable 32-bit data transfer.
Options: Enabled (Default) / Disabled
Hard Disk Write Protect
Disable or enable device write protection. This will be effective only if the device
is acc essed through BIOS.
Options: Disabled (Default) / Enabled
IDE Detect Time Out (Sec)
Select the time out value for detecting IDE/SATA devices.
Options: 35 (Default) / 30 / 25 / 20 / 15 / 10 / 5 / 0

G31-M4 BIOS Manual
7
2 Advanced Menu
The Advanced Menu allows you to configure the settings of CPU, Super I/O, Power
Management, and other system devices.
Notice
zBeware of that setting inappropriate values in items of this menu may cause
system to malfunction.
BIOS SETUP UTILITY
Main Advanced PCIPnP Boot Chipset Performance
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Go to Sub Screen
General Help
Save and Exit
Exit
Enter
F1
F10
ESC
Configure CPU.Advanced Settings
WARNING: Setting wrong values in below sections
may cause system to malfunction.
> USB Configuration
> SuperIO Configuration
> Hardware Health Configuration
> Power Configuration
> CPU Configuration
Exit
CPU Configuration
This item shows the CPU information that the BIOS automatic ally detects.
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
This should be enabled
in order to enable or
disable the Hardware
Prefetcher Disable
Feature.
Configure advanced CPU settings
Module Version:3F.07
Manufacturer:Intel
Frequency :
FSB Speed :
Cache L1 :
Cache L2 :
Ratio Actual Value:
Hardware Prefetcher [Enabled]
Adjacent Cache Line Prefetch [Enabled]
Max CPUID Value Limit [Disabled]
Hyper Threading Technology [Enabled]

G31-M4 BIOS Manual
8
Hardware Prefetcher
The processor has a hardware prefetcher that automatically analyzes its requirements
and prefetc hes data and ins tructio ns from the memory into the Level 2 cache that are
likely to be required in the near future. This reduces the latency associated with
memory reads.
Options: Enabled (Default) / Dis abled
Adjacent Cache Line Prefetch
The processor has a hardware ad jacent c ache line p refetch mechanis m that
automatically fetches an extra 64-byte cache line whenever the processor requests for
a 64-byte cache line. This reduces cac he latency b y making the next cac he line
immediately available if the processor requires it as well.
Options: Enabled (Default) / Dis abled
Max CPUID Value Limit
When the computer is booted up, the operating system executes the CPUID
instruction to identify the processor and its capabilities. Before it can do so, it must
first query the processor to find out the highest input value CPUID recognizes. This
determines the kind of basic information CPUID can provide the operating system.
Options: Disabled (Default) / Enabled
Hyper Threading Technology
Enabled for Windows XP and Linux4 (OS optimized for Hyper Threading
Technology) and disabled for other OS (OS not optimized for Hyper Threading
Technology).
Options: Enabled (Default) / Disabled

G31-M4 BIOS Manual
9
SuperIO Configuration
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Allows BIOS to Enable
or Disable Floppy
Controller.
Configure ITE8718 Super IO Chipset
OnBoard Floppy Controller [Enabled]
Serial Port1 Address [3F8/IRQ4]
Parallel Port Address [378]
Parallel Port Mode [Normal]
Parallel Port IRQ [IRQ7]
Restore on AC Power Loss [Power Off]
Onboard Floppy Controller
Select enabled if your system has a floppy disk controller (FDC) installed on the
system board and you wish to use it. If you installed another FDC or the system uses
no floppy drive, select disabled in this field.
Options: Enabled (Default) / Disabled
Serial Port1 Address
Select an address and corresponding interrupt for the first and second serial ports.
Options: 3F8/IRQ4 (Default) / 2F8/IRQ3 / 3E8/IRQ4 / 2E8/IRQ3 /Disabled
Parallel Port Address
This item allows you to determine access onboard parallel port controller with which
I/O Address.
Options: 378 (Default) / 278 / 3BC / Disabled
Parallel Port Mode
This item allows you to determine how the parallel port should function.
Options: Normal (Default) Using Parallel port as Standard Printer Port.
EPP Using Parallel Port as Enhanced Parallel Port.
ECP Using Parallel port as Extended Capabilities Port.
ECP+EPP Using Parallel port as ECP & EPP mode.

G31-M4 BIOS Manual
10
ECP Mode DMA Channel
This item allows you to select parallel port ECP DMA.
Options: DMA3 (Default) / DMA0 / DMA1
Parallel Port IRQ
This item allows you to select the IRQ for the onboard parallel port.
Options: IRQ7 (Default) / IRQ5 / Disabled
Restore on AC Power Loss
This setting specifies how your system should behave after a power fail or interrupts
occurs. By choosing Disabled will leave the computer in the power off state.
Choosing Enabled will restore the system to the status before power failure or
interrupt occurs.
Options: Power Off (Default) / Power ON / Last State
Hardware Health Configuration
This item shows the system temperature, fan speed, and vo ltage information.
Advanced
Hardware Health Configuration
H/W Health Function [Enabled]
Shutdown Temperature [Disabled]
CPU Temperature
System Temperature
SYS1 FAN Speed
CPU FAN Speed
+12.0V
+5.00V
CPU Vcore
Chipset Voltage
DDR Voltage
BIOS SETUP UTILITY
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Enables Hardware
Health Monitoring
Device.
H/W Health Function
If with a monitoring system, the system will show PC health status during POST
stage.
Options: Enabled (Default) / Disabled

G31-M4 BIOS Manual
11
Shutdown Temperature
This item allows you to set up the CPU shutdown Temperature. This item is only
effective under Windows 98 ACPI mode.
Options: Disabled (Default) / 70℃/158℉/ 60℃/140℉/ 65℃/149℉/ 75℃/158℉
/ 80℃/158℉/ 85℃/158℉/ 90℃/158℉/ 95℃/158℉
ACPI Configuration
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Select the ACPI
state used for
System Suspend.
ACPI Settings
Advanced Resume Event Controls
Suspend mode [S3(STR)]
ACPI Version Features [ACPI v1.0]
ACPI APIC support [Enabled]
AMI OEMB table [Enabled]
Headless mode [Disabled]
Energy Lake Feature [Diaabled]
APIC ACPI SCI IRQ [Disabled]
High Performance Event Timer [Disabled]
Resume On PME# [Disabled]
Resume On RTC Alarm [Disabled]
Resume On Ring [Disabled]
Suspend mode
The item allows you to select the suspend type under the ACPI operating system.
Options: S3 (STR) (Default) Suspend to RAM
Auto POS+STR
Repost Video on S3 Resume
The item allows you to determine whether to invoke VGA BIOS post on S3/STR
resume.
Options: No (Default) / Yes
ACPI Version Features
The item allo ws yo u to select the vers io n of ACPI.
Options: ACPI v1.0 (Default) / ACPI v2.0 / ACPI v3.0

G31-M4 BIOS Manual
12
ACPI APIC support
This item is used to enable or dis able the motherboard's APIC (Advanced
Programmable Interrupt Co ntroller). The APIC provides multip rocessor s upport,
more IRQs and faster interrupt handling.
Options: Enabled (Default) / Disabled
AMI OEMB table
Set this value to allow the ACPI BIOS to add a pointer to an OEMB table in the Root
System Description Table (RSDT) table.
Options: Enabled (Default) / Disabled
Headless mode
This is a server-specific feature. A headless server is one that operates without a
keyboard, monitor or mouse. To run in headless mode, both BIOS and operating
system (e.g. Windows Server 2003) must support headless operation.
Options: Disabled (Default) / Enabled
Energy Lake Feature
This item allo ws yo u to enable o r dis able the Energy Lake technolo gy feature.
Options: Disabled (Default) / Enabled
APIC ACPI SCI IRQ
This item is used to set APIC ACPI SCI by IRQ.
Options: Disabled (Default) / Enabled
High Per for mance Eve nt T imer
This item allows you to enable o r dis abled the HPET.
Options: Disabled (Default) / Enabled
HPET Memory Address
Options: Options: FED00000h (Default) / FED01000h / FED02000h / FED03000h

G31-M4 BIOS Manual
13
Resume On PME#
When you select Enabled, a PME signal from PCI card returns the system to Full ON
state.
For this function to work, you may need a LAN add-on card which supports the
Wake on LAN function. Set the Wake on LAN (WOL) jumper on motherboard to
enable if applicable.
Options: Disabled (Default) / Enabled
Resume On Ring
This item allows you control the wake on ring function.
Options: Disabled (Default) / Enabled
Resume On RTC Alarm
When “Enabled”, you can set the date and time at which the RTC (real-time clock)
alarm awakens the system from Suspend mode.
Options: Disabled (Default) / Enabled
RTC Alarm Date (Days)
You can choose which date the system will boot up.
RTC Alarm T ime
You can choos e the system boot up time, input ho ur, minute and second to specify.

G31-M4 BIOS Manual
14
USB Configuration
This item shows the USB controller and using USB device information.
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Enables support for
legacy USB. AUTO
option disables
legacy support if
no USB devices are
connected.
USB Configuration
USB Devices Enabled:
Module Version - 2.24.3-13.4
Legacy USB Support [Enabled]
USB 2.0 Controller Mode [HiSpeed]
BIOS EHCI Hand-Off [Enabled]
> USB Mass Storage Device 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
USB 2.0 Controller Mode
This item allows you to select the operation mode of the USB 2.0 controller.
Options: HiSpeed (Default) USB 2.0-480Mbps
FullSpeed USB 1.1-12Mbps
BIOS EHCI Hand-Off
This item allows you to enable s upport for operating systems without an EHCI
hand -off feature.
Options: Enabled (Default) / Disabled

G31-M4 BIOS Manual
15
USB Mass Storage Device Configuration
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Number of seconds
POST waits for the
USB mass storage
device after start
unit command.
USB Mass Storage Device Configuration
USB Mass Storage Reset Delay [20 Sec]
Emulation Type [Auto]
Device #
USB Mass Storage Reset Delay
This item allows you to set the reset delay for USB mass storage device.
Options: 20 Sec (Default) / 10 Sec / 30 Sec / 40 Sec
Emulation Type
This item allows you to select the emulation type of the USB mass storage device.
Options: Auto (Default) / Floppy / Forced FDD / Hard Disk / CDROM

G31-M4 BIOS Manual
16
3 PCIPnP Menu
This section describes configuring the PCI bus system. PCI, or Personal Computer
Interconnect, is a system which allows I/O devices to operate at speeds nearing the
speed of the CPU itself uses when communicating with its own special components.
Notice
zBeware of that setting inappropriate values in items of this menu may cause
system to malfunction.
BIOS SETUP UTILITY
Main Advanced PCIPnP Boot Chipset Performance
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Clear NVRAM during
System Boot.
Advanced PCI/PnP Settings
WARNING: Setting wrong values in below sections
may cause system to malfunction.
Plug & Play O/S [No]
PCI Latency Timer [64]
Allocate IRQ to PCI VGA [Yes]
Palette Snooping [Disabled]
PCI IDE BusMaster [Enabled]
> PCI Resource
> PCI Express Configuration
Clear NVRAM [No]
Exit
Clear NVRAM
This item allows you to clear the data in the NVRAM (CMOS) by selecting “Yes”.
Options: No (Default) / Yes
Plug & Play OS
When set to YES, BIOS will only initialize the PnP cards used for the boot sequence
(VGA, IDE, SCSI). The rest of the cards will be initialized by the PnP operating
system like Window™ 95. When set to NO, BIOS will initialize all the PnP cards.
For non-PnP operating systems (DOS, Netware™), this option must set to NO.
Options: No (Default) / Yes

G31-M4 BIOS Manual
17
PCI Latency Timer
This item controls how long a PCI device can hold the PCI bus before another takes
over. The longer the latency, the longer the PCI device can retain control of the bus
before handing it over to another PCI device.
Options: 64 (Default) / 0-255
Allocate IRQ to PCI VGA
This item allows BIOS to choose a IRQ to ass ign for the PCI VGA c ard.
Options: Yes (Default) / No
Palette Snooping
Some old graphic contro llers need to “snoop” on the VGA palette and then map it to
their display as a way to provide boot information and VGA compatibility. This item
allows such snooping to take place.
Options: Disabled (Default) / Enabled
PCI IDE BusMaster
This item is a toggle for the built-in driver that allows the onboard IDE controller to
perform DMA (Direct Memory Access) transfers.
Options: Enabled (Default) / Disabled
PCI Resource
BIOS SETUP UTILITY
PCIPnP
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Available: Specified
IRQ is available to be
used by PCI/PnP
devices.
Reserved: Specified
IRQ is reserved for
use by Legacy ISA
devices.
PCI Resource
IRQ3 [Available]
IRQ4 [Available]
IRQ5 [Available]
IRQ7 [Available]
IRQ9 [Available]
IRQ10 [Available]
IRQ11 [Available]
IRQ14 [Available]
IRQ15 [Available]
DMA Channel 0 [Available]
DMA Channel 1 [Available]
DMA Channel 3 [Available]
DMA Channel 5 [Available]
DMA Channel 6 [Available]
DMA Channel 7 [Available]
Reserved Memory Size [Disabled]

G31-M4 BIOS Manual
18
IRQ3/4/5/7/9/10/11/14/15
These items will allow you to assign each system interrupt a type, depending o n the
type of device us ing the interrupt. The option “ Available” means the IRQ is go ing
to assign automatically.
Options: Available (Default) / Reserved
DMA Channel 0/1/3/5/6/7
These items will allow you to assign each DMA channel a type, depending on the
type of device us ing the channel. The option “Available” means the channel is
going to assign automatically.
Options: Available (Default) / Reserved
Reserved Memory Size
This item allows BIOS to reserve certain memory size for specific PCI device.
Options: Disabled (Default) / 16K / 32K / 64K
PCI Express Configuration
BIOS SETUP UTILITY
PCIPnP
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Enable/Disable
PCI Express L0s and
L1 link power
states.
PCI Express Configuration
Active State Power-Management[Disabled]
> SB PCIE Ports Configuration
Active State Power-Management
This item sets the ASPM configuration for the PCI Express devices before the
operating systemboots. This function is for OS which does not support ASPM.
Options: Disabled (Default) / Enabled

G31-M4 BIOS Manual
19
SB PCIE Ports Configuration
BIOS SETUP UTILITY
PCIPnP
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
PCIE Ports Configuration
PCIE Port 0 [Auto]
PCIE Port 1 [Auto]
PCIE Port 2 [Auto]
PCIE Port 3 [Auto]
PCIE Port 4 [Auto]
PCIE Port 5 [Auto]
PCIE High Priority Port [Disabled]
PCIE Port 0 IOxAPIC Enable [Disabled]
PCIE Port 1 IOxAPIC Enable [Disabled]
PCIE Port 2 IOxAPIC Enable [Disabled]
PCIE Port 3 IOxAPIC Enable [Disabled]
PCIE Port 4 IOxAPIC Enable [Disabled]
PCIE Port 5 IOxAPIC Enable [Disabled]
Options
Auto
Enabled
Disabled
PCIE Port 0/1/2/3/4/5
Options: Auto (Default) / Enabled / Dis abled
PCIE High Priority Port
Options: Disabled (Default) / Enabled
PCIE Port 0/1/2/3/4/5 IOxAPIC Enable
Options: Disabled (Default) / Enabled