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0302f71c0a
ARM and ARM64 architectures use the device tree to pass UEFI parameters from stub to kernel. These parameters are things known to the stub but not discoverable by the kernel after the stub calls ExitBootSerives(). There is a helper function in: drivers/firmware/efi/fdt.c which the stub uses to add the UEFI parameters to the device tree. This patch adds a complimentary helper function which UEFI runtime support may use to retrieve the parameters from the device tree. If an architecture wants to use this helper, it should select CONFIG_EFI_PARAMS_FROM_FDT. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
61 lines
1.9 KiB
Plaintext
61 lines
1.9 KiB
Plaintext
menu "EFI (Extensible Firmware Interface) Support"
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depends on EFI
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config EFI_VARS
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tristate "EFI Variable Support via sysfs"
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depends on EFI
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default n
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help
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If you say Y here, you are able to get EFI (Extensible Firmware
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Interface) variable information via sysfs. You may read,
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write, create, and destroy EFI variables through this interface.
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Note that using this driver in concert with efibootmgr requires
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at least test release version 0.5.0-test3 or later, which is
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available from Matt Domsch's website located at:
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<http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
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Subsequent efibootmgr releases may be found at:
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<http://linux.dell.com/efibootmgr>
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config EFI_VARS_PSTORE
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tristate "Register efivars backend for pstore"
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depends on EFI_VARS && PSTORE
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default y
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help
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Say Y here to enable use efivars as a backend to pstore. This
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will allow writing console messages, crash dumps, or anything
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else supported by pstore to EFI variables.
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config EFI_VARS_PSTORE_DEFAULT_DISABLE
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bool "Disable using efivars as a pstore backend by default"
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depends on EFI_VARS_PSTORE
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default n
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help
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Saying Y here will disable the use of efivars as a storage
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backend for pstore by default. This setting can be overridden
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using the efivars module's pstore_disable parameter.
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config EFI_RUNTIME_MAP
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bool "Export efi runtime maps to sysfs"
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depends on X86 && EFI && KEXEC
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default y
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help
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Export efi runtime memory maps to /sys/firmware/efi/runtime-map.
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That memory map is used for example by kexec to set up efi virtual
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mapping the 2nd kernel, but can also be used for debugging purposes.
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See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
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config EFI_PARAMS_FROM_FDT
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bool
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help
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Select this config option from the architecture Kconfig if
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the EFI runtime support gets system table address, memory
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map address, and other parameters from the device tree.
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endmenu
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config UEFI_CPER
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bool
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