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# SPDX-License-Identifier: GPL-2.0-only menu "EFI (Extensible Firmware Interface) Support" depends on EFI config EFI_VARS tristate "EFI Variable Support via sysfs" depends on EFI default n help If you say Y here, you are able to get EFI (Extensible Firmware Interface) variable information via sysfs. You may read, write, create, and destroy EFI variables through this interface. Note that using this driver in concert with efibootmgr requires at least test release version 0.5.0-test3 or later, which is available from: <http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz> Subsequent efibootmgr releases may be found at: <http://github.com/vathpela/efibootmgr> config EFI_ESRT bool depends on EFI && !IA64 default y config EFI_VARS_PSTORE tristate "Register efivars backend for pstore" depends on EFI_VARS && PSTORE default y help Say Y here to enable use efivars as a backend to pstore. This will allow writing console messages, crash dumps, or anything else supported by pstore to EFI variables. config EFI_VARS_PSTORE_DEFAULT_DISABLE bool "Disable using efivars as a pstore backend by default" depends on EFI_VARS_PSTORE default n help Saying Y here will disable the use of efivars as a storage backend for pstore by default. This setting can be overridden using the efivars module's pstore_disable parameter. config EFI_RUNTIME_MAP bool "Export efi runtime maps to sysfs" depends on X86 && EFI && KEXEC_CORE default y help Export efi runtime memory maps to /sys/firmware/efi/runtime-map. That memory map is used for example by kexec to set up efi virtual mapping the 2nd kernel, but can also be used for debugging purposes. See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map. config EFI_FAKE_MEMMAP bool "Enable EFI fake memory map" depends on EFI && X86 default n help Saying Y here will enable "efi_fake_mem" boot option. By specifying this parameter, you can add arbitrary attribute to specific memory range by updating original (firmware provided) EFI memmap. This is useful for debugging of EFI memmap related feature. e.g. Address Range Mirroring feature. config EFI_MAX_FAKE_MEM int "maximum allowable number of ranges in efi_fake_mem boot option" depends on EFI_FAKE_MEMMAP range 1 128 default 8 help Maximum allowable number of ranges in efi_fake_mem boot option. Ranges can be set up to this value using comma-separated list. The default value is 8. config EFI_PARAMS_FROM_FDT bool help Select this config option from the architecture Kconfig if the EFI runtime support gets system table address, memory map address, and other parameters from the device tree. config EFI_RUNTIME_WRAPPERS bool config EFI_ARMSTUB bool config EFI_ARMSTUB_DTB_LOADER bool "Enable the DTB loader" depends on EFI_ARMSTUB default y help Select this config option to add support for the dtb= command line parameter, allowing a device tree blob to be loaded into memory from the EFI System Partition by the stub. If the device tree is provided by the platform or by the bootloader this option may not be needed. But, for various development reasons and to maintain existing functionality for bootloaders that do not have such support this option is necessary. config EFI_BOOTLOADER_CONTROL tristate "EFI Bootloader Control" depends on EFI_VARS default n ---help--- This module installs a reboot hook, such that if reboot() is invoked with a string argument NNN, "NNN" is copied to the "LoaderEntryOneShot" EFI variable, to be read by the bootloader. If the string matches one of the boot labels defined in its configuration, the bootloader will boot once to that label. The "LoaderEntryRebootReason" EFI variable is set with the reboot reason: "reboot" or "shutdown". The bootloader reads this reboot reason and takes particular action according to its policy. config EFI_CAPSULE_LOADER tristate "EFI capsule loader" depends on EFI help This option exposes a loader interface "/dev/efi_capsule_loader" for users to load EFI capsules. This driver requires working runtime capsule support in the firmware, which many OEMs do not provide. Most users should say N. config EFI_CAPSULE_QUIRK_QUARK_CSH bool "Add support for Quark capsules with non-standard headers" depends on X86 && !64BIT select EFI_CAPSULE_LOADER default y help Add support for processing Quark X1000 EFI capsules, whose header layout deviates from the layout mandated by the UEFI specification. config EFI_TEST tristate "EFI Runtime Service Tests Support" depends on EFI default n help This driver uses the efi.<service> function pointers directly instead of going through the efivar API, because it is not trying to test the kernel subsystem, just for testing the UEFI runtime service interfaces which are provided by the firmware. This driver is used by the Firmware Test Suite (FWTS) for testing the UEFI runtime interfaces readiness of the firmware. Details for FWTS are available from: <https://wiki.ubuntu.com/FirmwareTestSuite> Say Y here to enable the runtime services support via /dev/efi_test. If unsure, say N. config APPLE_PROPERTIES bool "Apple Device Properties" depends on EFI_STUB && X86 select EFI_DEV_PATH_PARSER select UCS2_STRING help Retrieve properties from EFI on Apple Macs and assign them to devices, allowing for improved support of Apple hardware. Properties that would otherwise be missing include the Thunderbolt Device ROM and GPU configuration data. If unsure, say Y if you have a Mac. Otherwise N. config RESET_ATTACK_MITIGATION bool "Reset memory attack mitigation" depends on EFI_STUB help Request that the firmware clear the contents of RAM after a reboot using the TCG Platform Reset Attack Mitigation specification. This protects against an attacker forcibly rebooting the system while it still contains secrets in RAM, booting another OS and extracting the secrets. This should only be enabled when userland is configured to clear the MemoryOverwriteRequest flag on clean shutdown after secrets have been evicted, since otherwise it will trigger even on clean reboots. config EFI_RCI2_TABLE bool "EFI Runtime Configuration Interface Table Version 2 Support" depends on X86 || COMPILE_TEST help Displays the content of the Runtime Configuration Interface Table version 2 on Dell EMC PowerEdge systems as a binary attribute 'rci2' under /sys/firmware/efi/tables directory. RCI2 table contains BIOS HII in XML format and is used to populate BIOS setup page in Dell EMC OpenManage Server Administrator tool. The BIOS setup page contains BIOS tokens which can be configured. Say Y here for Dell EMC PowerEdge systems. endmenu config UEFI_CPER bool config UEFI_CPER_ARM bool depends on UEFI_CPER && ( ARM || ARM64 ) default y config UEFI_CPER_X86 bool depends on UEFI_CPER && X86 default y config EFI_DEV_PATH_PARSER bool depends on ACPI default n config EFI_EARLYCON def_bool y depends on EFI && SERIAL_EARLYCON && !ARM && !IA64 select FONT_SUPPORT select ARCH_USE_MEMREMAP_PROT config EFI_CUSTOM_SSDT_OVERLAYS bool "Load custom ACPI SSDT overlay from an EFI variable" depends on EFI_VARS && ACPI default ACPI_TABLE_UPGRADE help Allow loading of an ACPI SSDT overlay from an EFI variable specified by a kernel command line option. See Documentation/admin-guide/acpi/ssdt-overlays.rst for more information.
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