CONFIG_EFI: EFI runtime service support

General informations

The Linux kernel configuration item CONFIG_EFI has multiple definitions:

EFI runtime service support found in arch/x86/Kconfig

The configuration item CONFIG_EFI:

• prompt: EFI runtime service support
• type: bool
• depends on: CONFIG_ACPI
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.25–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

This enables the kernel to use EFI runtime services that are available (such as the EFI variable services).

This option is only useful on systems that have EFI firmware. In addition, you should use the latest ELILO loader available at http://elilo.sourceforge.net in order to take advantage of EFI runtime services. However, even with this option, the resultant kernel should continue to boot on existing non-EFI platforms.

EFI runtime service support found in arch/loongarch/Kconfig

The configuration item CONFIG_EFI:

• prompt: EFI runtime service support
• type: bool
• depends on: (none)
• defined in arch/loongarch/Kconfig
• found in Linux kernels: 5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

This enables the kernel to use EFI runtime services that are available (such as the EFI variable services).

UEFI runtime support found in arch/riscv/Kconfig

The configuration item CONFIG_EFI:

• prompt: UEFI runtime support
• type: bool
• depends on: ( CONFIG_OF && ! CONFIG_XIP_KERNEL ) && ( CONFIG_MMU )
• defined in arch/riscv/Kconfig
• found in Linux kernels: 5.10–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

This option provides support for runtime services provided by UEFI firmware (such as non-volatile variables, realtime clock, and platform reset). A UEFI stub is also provided to allow the kernel to be booted as an EFI application. This is only useful on systems that have UEFI firmware.

UEFI runtime support found in arch/arm64/Kconfig

The configuration item CONFIG_EFI:

• prompt: UEFI runtime support
• type: bool
• depends on: ( CONFIG_OF && ! CONFIG_CPU_BIG_ENDIAN ) && ( CONFIG_KERNEL_MODE_NEON )
• defined in arch/arm64/Kconfig
• found in Linux kernels: 3.16–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

This option provides support for runtime services provided by UEFI firmware (such as non-volatile variables, realtime clock, and platform reset). A UEFI stub is also provided to allow the kernel to be booted as an EFI application. This is only useful on systems that have UEFI firmware.

UEFI runtime support found in arch/arm/Kconfig

The configuration item CONFIG_EFI:

• prompt: UEFI runtime support
• type: bool
• depends on: CONFIG_OF && ! CONFIG_CPU_BIG_ENDIAN && CONFIG_MMU && CONFIG_AUTO_ZRELADDR && ! CONFIG_XIP_KERNEL
• defined in arch/arm/Kconfig
• found in Linux kernels: 4.5–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

This option provides support for runtime services provided by UEFI firmware (such as non-volatile variables, realtime clock, and platform reset). A UEFI stub is also provided to allow the kernel to be booted as an EFI application. This is only useful for kernels that may run on systems that have UEFI firmware.

found in arch/ia64/Kconfig

The configuration item CONFIG_EFI:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/ia64/Kconfig
• found in Linux kernels: 2.6.1–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.6

Help text

(none)

Boot from EFI support found in arch/x86/Kconfig

The configuration item CONFIG_EFI:

• prompt: Boot from EFI support
• type: bool
• depends on: CONFIG_X86_32 && CONFIG_ACPI
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.24

Help text

This enables the kernel to boot on EFI platforms using system configuration information passed to it from the firmware. This also enables the kernel to use any EFI runtime services that are available (such as the EFI variable services).

This option is only useful on systems that have EFI firmware and will result in a kernel image that is ~8k larger. In addition, you must use the latest ELILO loader available at http://elilo.sourceforge.net in order to take advantage of kernel initialization using EFI information (neither GRUB nor LILO know anything about EFI). However, even with this option, the resultant kernel should continue to boot on existing non-EFI platforms.

Boot from EFI support found in arch/i386/Kconfig

The configuration item CONFIG_EFI:

• prompt: Boot from EFI support
• type: bool
• depends on: CONFIG_ACPI
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.6.18–2.6.23

Help text

This enables the kernel to boot on EFI platforms using system configuration information passed to it from the firmware. This also enables the kernel to use any EFI runtime services that are available (such as the EFI variable services).

This option is only useful on systems that have EFI firmware and will result in a kernel image that is ~8k larger. In addition, you must use the latest ELILO loader available at http://elilo.sourceforge.net in order to take advantage of kernel initialization using EFI information (neither GRUB nor LILO know anything about EFI). However, even with this option, the resultant kernel should continue to boot on existing non-EFI platforms.

Boot from EFI support (EXPERIMENTAL) found in arch/i386/Kconfig

The configuration item CONFIG_EFI:

• prompt: Boot from EFI support (EXPERIMENTAL)
• type: bool
• depends on: CONFIG_ACPI
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.6.1–2.6.17

Help text

This enables the the kernel to boot on EFI platforms using system configuration information passed to it from the firmware. This also enables the kernel to use any EFI runtime services that are available (such as the EFI variable services).

This option is only useful on systems that have EFI firmware and will result in a kernel image that is ~8k larger. In addition, you must use the latest ELILO loader available at http://elilo.sourceforge.net in order to take advantage of kernel initialization using EFI information (neither GRUB nor LILO know anything about EFI). However, even with this option, the resultant kernel should continue to boot on existing non-EFI platforms.

Hardware

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