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-rw-r--r--arch/i386/Kconfig7
-rw-r--r--arch/x86_64/Kconfig9
2 files changed, 15 insertions, 1 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index c134a545b37..e34a4dbd6b9 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -761,6 +761,13 @@ config CRASH_DUMP
depends on HIGHMEM
help
Generate crash dump after being started by kexec.
+ This should be normally only set in special crash dump kernels
+ which are loaded in the main kernel with kexec-tools into
+ a specially reserved region and then later executed after
+ a crash by kdump/kexec. The crash dump kernel must be compiled
+ to a memory address not used by the main kernel or BIOS using
+ PHYSICAL_START.
+ For more details see Documentation/kdump/kdump.txt
config PHYSICAL_START
hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 6cd4878625f..927b392a4aa 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -488,7 +488,14 @@ config CRASH_DUMP
bool "kernel crash dumps (EXPERIMENTAL)"
depends on EXPERIMENTAL
help
- Generate crash dump after being started by kexec.
+ Generate crash dump after being started by kexec.
+ This should be normally only set in special crash dump kernels
+ which are loaded in the main kernel with kexec-tools into
+ a specially reserved region and then later executed after
+ a crash by kdump/kexec. The crash dump kernel must be compiled
+ to a memory address not used by the main kernel or BIOS using
+ PHYSICAL_START.
+ For more details see Documentation/kdump/kdump.txt
config PHYSICAL_START
hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)