Add section describing the utility of coreimage ELF generation for
kmemdump.

Signed-off-by: Eugen Hristev <eugen.hristev@linaro.org>
---
 Documentation/dev-tools/kmemdump.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/dev-tools/kmemdump.rst b/Documentation/dev-tools/kmemdump.rst
index 504321de951a..5616843e0407 100644
--- a/Documentation/dev-tools/kmemdump.rst
+++ b/Documentation/dev-tools/kmemdump.rst
@@ -27,6 +27,14 @@ are limited.
 Although the kernel has multiple debugging mechanisms, kmemdump fits
 a particular model which is not covered by the others.
 
+kmemdump can also prepare specific regions of the kernel that can be
+put together to form a minimal core image file. To achieve this, the first
+region is an ELF header with program headers for each region, and another
+region contains specific ELF NOTE section with vmcoreinfo.
+There are also multiple regions registered with basic kernel information
+that will allow debugging tools like 'crash' to load the image.
+To enable this feature, use CONFIG_KMEMDUMP_COREIMAGE.
+
 kmemdump Internals
 ==================
 
-- 
2.43.0