Fit-PC4 BIOS guide

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  • See what is BIOS
  • fit-PC4 based on Phoenix Technologies BIOS.
  • BIOS can be accessed by pressing F2 during power up cycle.
  • For BIOS reset instructions refer to fit-PC4 Troubleshooting



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

System Information

  • BIOS Version: SBCFP4_3.0.0.312_9.3 X64 (example)
  • Build Time: MM/DD/YYYY
  • Platform Type: fit-PC4
  • Platform Revision: 1.2 (example)
  • Processor Type: AMD GX-420CA SOC with Radeon(TM) HD Graphics (example)
  • Processor Speed: 2.00 GHz (example)
  • System Memory Speed: 1600 MHz (example)
  • L2 Cache RAM: 2048 KB
  • Total memory: 8192 MB
    • [1]: 4096 MB (DDR3-1600) @ DIMM 0 (example)
    • [2]: 4096 MB (DDR3-1600) @ DIMM 1 (example)

Boot Features

  • NumLock: Selects Power-on state for NumLock - Off/On
  • Timeout: Number of seconds that P.O.S.T. will wait for the user input before booting.
  • CSM Support: Compatibility Support Module that provide backward compatibility services for legacy BIOS services, like int10/int13, dependent OS.
  • Quick Boot: Enable/disable quick boot.
  • Diagnostic Splash Screen: If you select 'Enabled' the diagnostic splash screen always displays during boot. If you select 'Disabled' the diagnostic splash screen does not display unless you press HOTKEY during boot.
  • Diagnostic Summary Screen: Display the Diagnostic summary screen during boot.
  • BIOS Level USB: Enable/Disable all BIOS support for USB in order to reduce boot time. Note that this prevent using a USB keyboard in setup or USB biometric scanner such as finger print reader to control access to setup, but does not prevent the operating system from supporting such hardware.
  • Allow Hotkey in S4 resume: Enable hotkey detection when system resuming from Hibernate state.
  • UEFI Boot: Enable the UEFI boot.
  • Legacy Boot: Enable the Legacy boot.
  • Boot in legacy video mode: Enable to force the display adapter to switch the video mode to Text Mode 3 at the end of BIOS POST for non-UEFI boot mode (Legacy Boot). Some legacy software such as DUET requires that the BIOS explicitly enter text video mode prior to boot.
  • Load OPROM: Load all OPROMs or on demand according to the boot device.


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

  • SD Card Mode: Disabled/ADMA/DMA/PIO
  • Audio: Auto/Enabled/Disabled
  • AC Loss Conrtol: Set the way fit-PC4 is turned-on after power failure/interruption occurred or the moment power cable is plugged. The available options are:
    • Always Off - system remains off
    • Always On - system powers on automatically
    • Previous State - based on system state before the failure it will be either On or Off

PCIe/mSATA Configuration

  • mPCIE1 Module: Select between mSATA and PCI Express interface on the shared slot. Default mSATA.
  • UMI Gen2: Enables/Disables TBD
  • FCH GPP OPTION: Enables/Disables TBD
  • FCH GPP Port Link: TBD
    • X4 mode:
    • 2:2 mode:
    • 2 1:1 mode:
    • 1:1:1:1 mode:
  • PSPP Policy: PCIe speed power policy
    • Disabled
    • Performance
    • Balanced-High
    • Balanced-Low
    • Power Saving
    • Auto

SATA Configuration

Set hard drive and controller configuration:

  • SATA Conrtoller: Enable/Disable SATA device.
  • SATA Mode: Set SATA controller between legacy IDE and AHCI modes.

USB Configuration

  • XHCI Controller: Enable/Disable XHCI HCs (Bus 0 Dev 16 Fn 0). When disable it that will active USB3.
  • USB1: Enable/Disable USB1 HCs (Bus 0 Dev 18 Fn 0/2)
  • USB2: Enable/Disable USB2 HCs (Bus 0 Dev 19 Fn 0/2)

GFX Configuration

HD Graphics and Audio settings:

  • Integrated Graphics: Auto/Disabled/Force - Enable integrated Graphics controller.
  • NB Azalia: Auto/Disabled/Enabled - Enable integrated HD Audio controller.

Watchdog Configuration

  • Watchdog: Enable/Disable watchdog timer.
  • Watchdog count: Set Watchdog countdown timer, range between 15 sec-4 min.


Configure different security settings.


Set boot order priorities.


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