From mboxrd@z Thu Jan 1 00:00:00 1970 From: AKASHI Takahiro Subject: [PATCH v23 9/9] Documentation: dt: chosen properties for arm64 kdump Date: Tue, 26 Jul 2016 17:02:06 +0900 Message-ID: <20160726080206.2441-1-takahiro.akashi@linaro.org> References: <20160726075659.2290-1-takahiro.akashi@linaro.org> Return-path: In-Reply-To: <20160726075659.2290-1-takahiro.akashi-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: catalin.marinas-5wv7dgnIgG8@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Cc: james.morse-5wv7dgnIgG8@public.gmane.org, geoff-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, bauerman-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, AKASHI Takahiro List-Id: devicetree@vger.kernel.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-QSEj5FYQhm4dnm+yROfE0A@public.gmane.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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html