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These applications can utilize UEFI drivers and services. This OS is used specifically for installing updates. Microsoft provides a UEFI flashing application which can be used in non-manufacturing scenarios. The SoC firmware boot loaders initialize the minimal set of hardware required for the device to run. The SoC firmware boot loaders are designed to finish as fast as possible, and nothing is drawn to the screen while they are running.
The SoC firmware boot loaders also contain an emergency flashing capability that allows devices to be flashed when the boot environment is not stable and Full Flash Update FFU image-based flashing using the Microsoft-provided flashing tool is not possible.
Emergency flashing requires tools specific to the SoC. For more information, contact the SoC vendor. Inside the boot environment, individual boot applications started by the Boot Manager provide functionality for all customer-facing scenarios before the device boots. All components inside the boot environment are provided by Microsoft and cannot be modified, replaced, or omitted by OEMs.
The following diagram illustrates some of the key portions of the process that the Boot Manager follows after it is launched by the UEFI environment. After the UEFI environment launches the Boot Manager, the Boot Manager initializes boot libraries , reads the boot configuration database to determine which boot applications to run and in which order to run them.
The Boot Manager launches boot applications sequentially, and each application exits back to the Boot Manager after finishing. Boot libraries are libraries of functions that extend upon existing UEFI functionality, and are designed to be used within the boot environment.
Only boot applications, which are launched by the Boot Manager, have access to the boot libraries. The Boot Manager first captures any reserved hardware button combinations that are pressed by the user. In non-retail OS images, the Boot Manager next runs an offline crash dump boot application which allows the device to capture a snapshot of physical memory from the previous OS session. When the device resets abnormally, the previous OS session's memory is preserved across the reset.
When this happens, the offline crash dump application will save that memory and turn it into an offline crash dump file, which can be transferred off the device and analyzed.
If the device did not reset abnormally in the previous OS session, the offline crash dump application exits immediately. In all OS images, the Boot Manager next runs mobilestartup. This application runs several boot libraries, some of which are only run on first boot for example, to provision the secure boot policy or only in non-retail images for example, to enter USB mass storage mode.
The following libraries are always run:. First, mobilestartup. UEFI protocols for Windows. Skip to main content. This browser is no longer supported. Table of contents Exit focus mode. Table of contents. Note Some information in this section may apply only to Windows 10 Mobile and certain processor architectures.
Submit and view feedback for This product This page. View all page feedback. Additional resources In this article. Observation and adherence to these requirements will help ensure proper functionality of Windows.
Windows 10 uefi driver.UEFI requirements for Windows 10 Mobile
This allows the device to use as little power as possible while booting, and to charge as quickly as possible when charging in UEFI. During the boot process, Microsoft defines standalone presses of the power, volume up and volume down buttons as triggers that can be used to start several Microsoft-provided UEFI applications.
OEMs must not overload the power, volume up or volume down button during boot to perform custom actions or start other UEFI applications. Power: Microsoft-provided developer boot menu application. Note: OEMs must also ensure that the volume up and volume down buttons function as up arrow and down arrow keys, respectively, in the UEFI environment. These applications have the following restrictions: UEFI applications should not affect boot time.
When device encryption is enabled, the trusted platform module TPM stores the boot sequence, and it cannot be changed after device encryption is enabled. After the device's firmware initializes all the hardware, the device needs to ensure that there is enough power to boot. Afterwards, the device needs to ensure that the device is booting into the appropriate OS depending on if the user wants to perform an update or a restore on the device, or if the user wants to boot the device into the main OS.
To accommodate each of these scenarios, the Windows 10 boot process uses the following components:. The device is powered on and runs the SoC-specific firmware boot loaders, which initialize the hardware on the device and provide emergency flashing functionality. These applications can utilize UEFI drivers and services. This OS is used specifically for installing updates. Microsoft provides a UEFI flashing application which can be used in non-manufacturing scenarios. The SoC firmware boot loaders initialize the minimal set of hardware required for the device to run.
The SoC firmware boot loaders are designed to finish as fast as possible, and nothing is drawn to the screen while they are running. The SoC firmware boot loaders also contain an emergency flashing capability that allows devices to be flashed when the boot environment is not stable and Full Flash Update FFU image-based flashing using the Microsoft-provided flashing tool is not possible. Emergency flashing requires tools specific to the SoC. For more information, contact the SoC vendor.
This device firmware can be updated using a device driver package using the same mechanism as system firmware. A device firmware update is distributed as a firmware update package.
After the firmware update package is on the end-user's system, Windows will use the UEFI UpdateCapsule function to hand-off the device firmware payload to the platform firmware for processing. This process is identical to how Windows hands off system firmware update payload, and is discussed below.
It's recommended that device firmware is updated using a discrete firmware update driver package. However, device firmware may also be updated with system firmware as part of a single firmware update driver package. UEFI should not be used to update peripheral devices. UEFI requires devices to be present during reboot to apply a firmware update which cannot be guaranteed with external, removable peripheral devices. This device firmware can be updated by the device driver during the normal Windows OS runtime.
Updating device firmware using normal Windows OS drivers isn't covered by this paper. In order for a system to be compatible with the Windows firmware updating mechanism, it must meet the following requirements:. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Some information in this section may apply only to Windows 10 Mobile and certain processor architectures.
UEFI is a general framework for boot loaders based on a standard UEFI specification, which describes a standard environment and set of interfaces for platform firmware that allows operating systems to boot. These applications should not be accessible to the end-user. OEMs that choose to implement UEFI applications should make sure that they have a small a memory footprint as possible and do not impact boot time.
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