cheatsheet.md: Add GDB and coredump tips
Change-Id: I5d274525aa34f20606454b8f7f5ccfca99ba5640
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/cheatsheet.md b/cheatsheet.md
index 69735f2..9efbb18 100644
--- a/cheatsheet.md
+++ b/cheatsheet.md
@@ -156,3 +156,27 @@
```
curl -c cjar -b cjar -k -H "Content-Type: application/json" -X POST -d '{"data": []}' https://palm5-bmc/org/openbmc/control/chassis0/action/powerOn
```
+
+## GDB
+
+[SDK build](#building-the-openbmc-sdk) provides GDB and debug symbols:
+
+* `$GDB` is available to use once SDK environment is setup
+* Debug symbols are located in `.debug/` directory of each executable
+
+To use GDB:
+
+1. Setup SDK environment;
+2. Run below GDB commands:
+ ```
+ cd <sysroot_of_sdk_build>
+ $GDB <relative_path_to_exeutable> <path_to_core_file>
+ ```
+
+## Coredump
+
+By default coredump is disabled in OpenBMC. To enable coredump:
+```
+echo '/tmp/core_%e.%p' | tee /proc/sys/kernel/core_pattern
+```
+