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authorOctavian Purdila <octavian.purdila@intel.com>2016-07-08 19:13:12 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-07-08 21:52:35 +0200
commit475fb4e8b2f4444d1d7b406ff3a7d21bc89a1e6f (patch)
tree25deca4b6de41e23d3d8abe44c6f6b94493d50f8 /Documentation/kernel-parameters.txt
parent7f24467f3b357ab6abc146c47fcedd7d57a189b6 (diff)
downloadlinux-aarch64-475fb4e8b2f4444d1d7b406ff3a7d21bc89a1e6f.tar.gz
efi / ACPI: load SSTDs from EFI variables
This patch allows SSDTs to be loaded from EFI variables. It works by specifying the EFI variable name containing the SSDT to be loaded. All variables with the same name (regardless of the vendor GUID) will be loaded. Note that we can't use acpi_install_table and we must rely on the dynamic ACPI table loading and bus re-scanning mechanisms. That is because I2C/SPI controllers are initialized earlier then the EFI subsystems and all I2C/SPI ACPI devices are enumerated when the I2C/SPI controllers are initialized. Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 82b42c958d1c..bbfb56fe7b92 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1185,6 +1185,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Address Range Mirroring feature even if your box
doesn't support it.
+ efivar_ssdt= [EFI; X86] Name of an EFI variable that contains an SSDT
+ that is to be dynamically loaded by Linux. If there are
+ multiple variables with the same name but with different
+ vendor GUIDs, all of them will be loaded. See
+ Documentation/acpi/ssdt-overlays.txt for details.
+
+
eisa_irq_edge= [PARISC,HW]
See header of drivers/parisc/eisa.c.