[PATCH v21 8/8] Documentation: dt: usable-memory and elfcorehdr nodes for arm64 kexec
From: AKASHI Takahiro <hidden>
Date: 2016-07-06 07:52:26
Also in:
kexec
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: James Morse <james.morse@arm.com> Add documentation for linux,usable-memory and linux,elfcorehdr chosen nodes used by arm64 kexec to decribe the kdump reserved area, and the elfcorehdr's location within it. Signed-off-by: James Morse <james.morse@arm.com> [akashi: wrap the commit description to avoid a checkpatch warning] Signed-off-by: AKASHI Takahiro <redacted> --- Documentation/devicetree/bindings/chosen.txt | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
index 6ae9d82..443f88b 100644
--- a/Documentation/devicetree/bindings/chosen.txt
+++ b/Documentation/devicetree/bindings/chosen.txt@@ -52,3 +52,31 @@ This property is set (currently only on PowerPC, and only needed on book3e) by some versions of kexec-tools to tell the new kernel that it is being booted by kexec, as the booting environment may differ (e.g. a different secondary CPU release mechanism) + +linux,usable-memory +------------------- + +This property is set on PowerPC and arm64 by kexec-tools during kdump +to tell the crash kernel the base address of its reserved area of memory, and +the size. e.g. + +/ { + chosen { + linux,usable-memory = <0x9 0xf0000000 0x0 0x10000000>; + }; +}; + +linux,elfcorehdr +---------------- + +This property is set (currently only on arm64) by kexec-tools during kdump +to tell the crash kernel the address and size of the elfcorehdr that describes +the old kernel's memory as an elf file. This memory must reside within the area +described by 'linux,usable-memory'. e.g. + +/ { + chosen { + linux,usable-memory = <0x9 0xf0000000 0x0 0x10000000>; + linux,elfcorehdr = <0x9 0xfffff000 0x0 0x800>; + }; +};
--
2.9.0