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Documentation: kdump: describe arm64 port 

Add arch specific descriptions about kdump usage on arm64 to kdump.txt.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Baoquan He <bhe@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
AKASHI Takahiro 2017-04-03 11:24:40 +09:00 committed by Catalin Marinas
parent 3f5c1e1e76
commit 0ceb7d887e
1 changed files with 15 additions and 1 deletions
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16
Documentation/kdump/kdump.txt
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@ -18,7 +18,7 @@ memory image to a dump file on the local disk, or across the network to
a remote system. a remote system.
Kdump and kexec are currently supported on the x86, x86_64, ppc64, ia64, 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 When the system kernel boots, it reserves a small section of memory for
the dump-capture kernel. This ensures that ongoing Direct Memory Access the dump-capture kernel. This ensures that ongoing Direct Memory Access
@ -249,6 +249,13 @@ Dump-capture kernel config options (Arch Dependent, arm)
AUTO_ZRELADDR=y AUTO_ZRELADDR=y
Dump-capture kernel config options (Arch Dependent, arm64)
----------------------------------------------------------
- Please note that kvm of the dump-capture kernel will not be enabled
on non-VHE systems even if it is configured. This is because the CPU
will not be reset to EL2 on panic.
Extended crashkernel syntax Extended crashkernel syntax
=========================== ===========================
@ -305,6 +312,8 @@ Boot into System Kernel
kernel will automatically locate the crash kernel image within the kernel will automatically locate the crash kernel image within the
first 512MB of RAM if X is not given. 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 Load the Dump-capture Kernel
============================ ============================
@ -327,6 +336,8 @@ For s390x:
- Use image or bzImage - Use image or bzImage
For arm: For arm:
- Use zImage - Use zImage
For arm64:
- Use vmlinux or Image
If you are using a uncompressed vmlinux image then use following command If you are using a uncompressed vmlinux image then use following command
to load dump-capture kernel. to load dump-capture kernel.
@ -370,6 +381,9 @@ For s390x:
For arm: For arm:
"1 maxcpus=1 reset_devices" "1 maxcpus=1 reset_devices"
For arm64:
"1 maxcpus=1 reset_devices"
Notes on loading the dump-capture kernel: Notes on loading the dump-capture kernel:
* By default, the ELF headers are stored in ELF64 format to support * By default, the ELF headers are stored in ELF64 format to support