From mboxrd@z Thu Jan 1 00:00:00 1970 From: takahiro.akashi@linaro.org (AKASHI Takahiro) Date: Tue, 12 Jul 2016 14:05:14 +0900 Subject: [PATCH v22 8/8] Documentation: dt: chosen properties for arm64 kdump In-Reply-To: <20160712050514.22307-1-takahiro.akashi@linaro.org> References: <20160712050514.22307-1-takahiro.akashi@linaro.org> Message-ID: <20160712050514.22307-9-takahiro.akashi@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: James Morse Add documentation for linux,crashkernel-base and crashkernel-size, linux,usable-memory-range, and linux,elfcorehdr used by arm64 kexec/kdump to decribe the kdump reserved area, and the elfcorehdr's location within it. Signed-off-by: James Morse [takahiro.akashi at linaro.org: renamed "usable-memory" to "usable-memory-range", added "linux,crashkernel-base" and "-size" ] Signed-off-by: AKASHI Takahiro --- Documentation/devicetree/bindings/chosen.txt | 45 ++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt index 6ae9d82..d7a3a86 100644 --- a/Documentation/devicetree/bindings/chosen.txt +++ b/Documentation/devicetree/bindings/chosen.txt @@ -52,3 +52,48 @@ 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,crashkernel-base +linux,crashkernel-size +---------------------- +These properties are set (on PowerPC and arm64) during kdump to tell +use-space tools, like kexec-tools, the base address of the crash-dump +kernel's reserved area of memory and the size. e.g. + +/ { + chosen { + linux,crashkernel-base = <0x9 0xf0000000>; + linux,crashkernel-size = <0x0 0x10000000>; + }; +}; + +linux,usable-memory-range +------------------------- + +This property is set (currently only on arm64) during kdump to tell +the crash-dump kernel the base address of its reserved area of memory, +and the size. e.g. + +/ { + chosen { + linux,usable-memory-range = <0x9 0xf0000000 0x0 0x10000000>; + }; +}; + +Please note that, if this property is present, any memory regions under +"memory" nodes will be ignored. + +linux,elfcorehdr +---------------- + +This property is set (currently only on arm64) during kdump to tell +the crash-dump 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-range'. e.g. + +/ { + chosen { + linux,usable-memory = <0x9 0xf0000000 0x0 0x10000000>; + linux,elfcorehdr = <0x9 0xfffff000 0x0 0x800>; + }; +}; -- 2.9.0