Fitlet BIOS guide

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  • See what is BIOS
  • fitlet BIOS is based on American Megatrends Inc. (AMI) BIOS.
  • BIOS can be accessed by pressing Del during power up cycle.
  • For BIOS reset instructions refer to fitlet troubleshooting



The screen provides date, time and boot features settings, as well as basic system information:

  • BIOS Vendor: American Megatrends
  • Core Version:
  • Compliancy: UEFI 2.3.1; PI 1.2
  • BIOS Version: Format SBCFLT_X.XX.XX_X - useful to check if you have the latest BIOS installed
  • Build Date and Time: MM/DD/YYYY HH:MM:SS
  • System Date: HH:MM:SS
  • System Time: Weekday MM/DD/YYYY
  • Access Level: Administrator


The section provides advanced system features and functionality settings.
Warning: For advanced users only. Setting items to incorrect values may cause system to malfunction.

PCI Settings

PCI, PCI-X and PCI Express settings:

  • PCI Latency Timer: Value to be programmed into PCI latency timer register.
  • VGA Palette Snoop: Enables or Disables VGA palette registers snooping.
  • PERR# Generation: Enables or Disables PCI device to generate PERR#.
  • SERR# Generation: Enables or Disables PCI device to generate SERR#.
  • Relaxed Ordering: Enables or Disables PCI Express device relaxed ordering.
  • Extended Tag: If enabled allows device to use 8-bit tag field as a requester.
  • No Snoop: Enables or Disables PCI Express device no snoop option.
  • Maximum Payload: Set maximum payload of PCI Express device or allow system BIOS to select the value automatically.
  • Maximum Read Request: Set maximum read request size of PCI Express device or allow system BIOS to select the value automatically.
  • ASPM Support: Set the ASPM (Active State Power Management) level:
    • Force L0s - force all links to L0s state
    • Auto - BIOS auto configure
    • Disable - disables ASPM
  • Extended Synch: If enabled allows generation of extended synchronization patterns.
  • Link Training Retry: Defines number of retry attempts SW will take to retrain the link if previous attempt was unsuccessful.
  • Link Training Timeout (uS): Defines number of microseconds SW will wait before polling "Link Training" bit in link status register. Value range 10-10000 us.
  • Restore PCIE Registers: On non-PCI Express aware OS's (Pre Windows Vista) some devices may not be correctly reinitialized after S3 (sleep state). Enabling this restores PCI Express device configurations on S3 resume. Warning: Enabling this may cause issues with other HW after S3 resume.

Power Settings

System ACPI and power management policy parameters:

  • ACPI Auto Configuration: Enables or Disables BIOS ACPI (power management policy) auto configuration.
  • Hibernation State: Enables or Disables system ability to Hibernate (S4). This option may be not effective with some OS.
  • Sleep State: Select ACPI sleep state the system will enter when Suspend/Power button is pressed.
  • Lock Legacy Resources: Enables or Disables lock of legacy resources.
  • Restore on AC Power Loss: Set the way fitlet is turned-on after power failure/interruption occurred or the moment power cable is plugged. The available options are:
    • Power On - system powers on automatically
    • Power Off - system remains off
    • Last State - based on system state before the failure it will be either On or Off
    • Disable - the feature is disabled
  • APU TDP: Set processor maximum power consumption (thermal design power). Enter values between 1-25000 [mW], when default value is 4500 [mW]. Higher value means better performance, that may result in higher temperature.

TPM Settings

Note: TPM module is not assembled by default. The option relevant in high volume orders.

Trusted platform module settings:

  • Security Device Support: Enables or Disables BIOS support for security device. OS will not show security device. TCG EFI protocol and INT1A interface will not be available.

CPU Settings

CPU configuration parameters:

  • PSS Support: Enable or Disable the generation of ACPI _PPC, _PPS and _PCT objects.
  • PSTATE Adjustment: Provide to adjust start-up P-state level.
  • NX Mode: Enable or Disable non-execute page protection function.
  • SVM Mode: Enable or Disable CPU virtualization.
  • C6 Mode: Enable or Disable C6 state.
  • CPB Mode: Auto or Disable core performance boost.
  • Core Leveling Mode: Change the number of Cores in the system.

Video Settings

  • Integrated Graphics: Enable or Disable integrated graphics controller.
  • UMA Frame Buffer Size: Set frame buffer size (32MB-2GB).
  • Remote Display Feature: Enable or Disable remote display feature support.
  • HDMI Audio: Enable or Disable Gnb HD audio support.
  • IOMMU: Enable or Disable IOMMU support.
  • PSPP Policy: Configure PCI Express speed power policy:
    • Disabled
    • Performance
    • Balanced-High
    • Balanced-Low
    • Power saving

SATA Settings

Storage devices interface configuration:

  • OnChip SATA Channel: Enable or Disable SATA channel for storage devices.
  • OnChip SATA Type: Set SATA host controller interface type for storage devices communication.
    • Native IDE
    • AHCI
    • Legacy IDE
    • AHCI as ID 7804
  • OnChip IDE Mode: Set old standard IDE mode, either legacy or native.
  • SATA IDE Combined Mode: Enabled or Disabled IDE combined mode.

Memory Settings

  • Memory Clock: This option allows user to select different memory clock. Can be set to Auto detection or manually selected.
  • Memory Clear: Memory clear functionality control.
Memory Configuration
  • Memory Hole Remapping: Enable or Disable memory hole remapping.
  • Bank Interleaving: Enable or Disable bank interleaving.
  • Memory Hole 15MB – 16MB: Enable or Disable memory hole 15MB-16MB for some ISA expansion cards.
  • Socket Information: Basic information about memory SO-DIMM used.

SDIO Settings

SD/SDIO configuration parameters:

  • SDIO Access Mode: Set SD device access mode:
    • Auto - Access SD device in DMA mode if controller support it, otherwise in PIO mode.
    • DMA - Access SD device in DMA mode.
    • PIO - Access SD device in PIO (programmed input/output) mode.
  • Mass Storage Device Emulation Type: TBD

USB Settings

  • Legacy USB Support: Enables legacy USB support. Auto option disables legacy support if no USB devices are connected. Disabled option will keep USB devices available only for EFI applications.
  • XHCI Hand-off: Workaround for OS without XHCI hand-off support. The XHCI ownership change should be claimed by XHCI driver.
  • EHCI Hand-off: Workaround for OS without EHCI hand-off support. The EHCI ownership change should be claimed by EHCI driver.
  • USB Mass Storage Driver Support: Enable or Disable USB mass storage driver support.
  • Port 60/64 Emulation: Enable I/O port 60h/64h emulation support. This option should be enabled for the complete USB keyboard legacy support for non-USB aware operating systems.
  • USB transfer timeout: Timeout value for control, bulk and interrupt transfers - 1 sec, 5 sec, 10 sec or 20 sec.
  • Device reset timeout: USB mass storage device start unit command time-out.
  • Device power-up delay: Maximum time the device will take before it properly reports itself to the Host Controller.
    • Auto - uses default value: for a root port it is 100 ms, for a hub port the delay is taken from the hub descriptor.


  • Setup Prompt Timeout: Number of seconds to wait for setup activation key. 65535 (0xFFFF) means indefinite waiting.
  • Bootup Numlock State: Select the keyboard NumLock state.
  • Quiet Boot: Enables or Disables quiet boot option.
  • Fast Boot: Enables or Disables boot with initialization of a minimal set of devices required to launch active boot option. Has no effect for BBS boot option.
  • SATA Support: TBD
  • VGA Support: TBD
  • USB Support: TBD
  • PS2 Device Support: If disabled PS2 device will be skipped.
  • Network Stack Driver Support: If disabled Network Stack driver will be skipped.
  • UEFI Boot: Configure UEFI boot options:
    • Auto - If the 1st boot HDD is GPT then enable UEFI boot options, otherwise disable.
    • Enabled - Enable all UEFI boot options.
    • Disabled - Disable all UEFI boot options.
  • Boot Mode Select: Select boot mode Legacy/UEFI.
  • Fixed Boot Order Priorities: Set boot order priorities.

CSM16 Parameters

CSM16 configurations. Enable/Disable, Option ROM, execution settings, etc. :

  • GateA20 Active:
    • Upon request - GA20 can be disabled using BIOS services.
    • Always - do not allow disabling GA20. This option is useful when any RT code above 1 MB is executed.
  • Option ROM Messages: Set display mode for option ROM.
  • INT19 Trap Response: BIOS reaction on INT19 trapping by Option ROM:
    • Immediate - execute the trap right away.
    • Postponed - execute the trap during legacy boot.

CSM Parameters

OpROM execution, boot options, filter, etc. :

  • Launch CSM: This options controls if CSM will be launched.
  • Boot option filter: This option controls what devices system can boot to.
  • Launch PXE OpROM policy: Controls the execution of UEFI and Legacy PXE OpROM.
  • Launch Storage OpROM policy: Controls the execution of UEFI and Legacy storage OpROM.
  • Launch Video OpROM policy: Controls the execution of UEFI and Legacy video OpROM.
  • Other PCI device ROM priority: For PCI devices other than network, mass storage or video defines which OpROM to launch.
  • Hard Drive BBS Priorities: Set the order of the legacy devices in this group.


  • Administrator Password: Set administrator password.
  • User Password: Set user password.

Secure Boot Menu

Customize secure boot settings:

  • Secure Boot: Secure boot can be enabled if:
    • System running in user mode with enrolled platform key (PK).
    • CSM function is disabled.
  • Secure Boot Mode: Secure boot mode selector. Custom mode enables users to change image execution policy and manage secure boot keys.
  • Key Management: Enables experienced users to modify secure boot variables.

Save & Exit

The exit screen provides options to save or discard changes before exiting BIOS.