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Commit 0ceb7d88 authored by AKASHI Takahiro's avatar AKASHI Takahiro Committed by Catalin Marinas
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Documentation: kdump: describe arm64 port 



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

Signed-off-by: default avatarAKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: default avatarBaoquan He <bhe@redhat.com>
Acked-by: default avatarDave Young <dyoung@redhat.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 3f5c1e1e

Documentation/kdump/kdump.txt

+15 −1
Original line number Original line Diff line number Diff line
@@ -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