[PATCH v20 13/14] arm64: kdump: update a kernel doc
Dave Young
dyoung at redhat.com
Thu Jun 30 06:00:17 PDT 2016
On 06/23/16 at 05:54pm, Geoff Levand wrote:
> From: AKASHI Takahiro <takahiro.akashi at linaro.org>
>
> This patch adds arch specific descriptions about kdump usage on arm64
> to kdump.txt.
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> ---
> Documentation/kdump/kdump.txt | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
> index 88ff63d..5d6da09 100644
> --- a/Documentation/kdump/kdump.txt
> +++ b/Documentation/kdump/kdump.txt
> @@ -18,7 +18,7 @@ memory image to a dump file on the local disk, or across the network to
> a remote system.
>
> Kdump and kexec are currently supported on the x86, x86_64, ppc64, ia64,
> -s390x and arm architectures.
> +s390x, arm and arm64 architectures.
>
> When the system kernel boots, it reserves a small section of memory for
> the dump-capture kernel. This ensures that ongoing Direct Memory Access
> @@ -249,6 +249,12 @@ Dump-capture kernel config options (Arch Dependent, arm)
>
> AUTO_ZRELADDR=y
>
> +Dump-capture kernel config options (Arch Dependent, arm64)
> +----------------------------------------------------------
> +
> +1) Currently, kvm will not be enabled on the dump-capture kernel even
> + if it is configured.
> +
> Extended crashkernel syntax
> ===========================
>
> @@ -305,6 +311,8 @@ Boot into System Kernel
> kernel will automatically locate the crash kernel image within the
> first 512MB of RAM if X is not given.
>
> + On arm64, use "crashkernel=Y[@X]". Note that the start address of
> + the kernel, X if explicitly specified, must be aligned to 2MiB (0x200000).
>
> Load the Dump-capture Kernel
> ============================
> @@ -327,6 +335,8 @@ For s390x:
> - Use image or bzImage
> For arm:
> - Use zImage
> +For arm64:
> + - Use vmlinux or Image
>
> If you are using a uncompressed vmlinux image then use following command
> to load dump-capture kernel.
> @@ -370,6 +380,9 @@ For s390x:
> For arm:
> "1 maxcpus=1 reset_devices"
>
> +For arm64:
> + "1 maxcpus=1 reset_devices"
> +
> Notes on loading the dump-capture kernel:
>
> * By default, the ELF headers are stored in ELF64 format to support
Looks good to me.
Acked-by: Dave Young <dyoung at redhat.com>
Thanks
Dave
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