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authorAKASHI Takahiro <takahiro.akashi@linaro.org>2017-04-03 11:24:40 +0900
committerAKASHI Takahiro <takahiro.akashi@linaro.org>2017-06-08 19:19:21 +0900
commit9fd5d068c185f7bf5c945d1796321d3da862e92a (patch)
tree703e1247eb55c54f0bb5cf29ba31f590d218f7c5
parent1a83b30c0ca4ef65491b1de2824d732a6fc6db5e (diff)
downloadlinux-aarch64-9fd5d068c185f7bf5c945d1796321d3da862e92a.tar.gz
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>
-rw-r--r--Documentation/kdump/kdump.txt16
1 files changed, 15 insertions, 1 deletions
diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
index b0eb27b956d9..615434d81108 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 +249,13 @@ Dump-capture kernel config options (Arch Dependent, arm)
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
===========================
@@ -305,6 +312,8 @@ 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 +336,8 @@ 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 +381,9 @@ 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