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authorRouven Czerwinski <r.czerwinski@pengutronix.de>2019-06-24 12:00:43 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2019-06-27 11:05:43 +0200
commitd71573a006a2fc2b83c076c556b88166f4e3dec3 (patch)
treeed0f9579d5e9b8b12c00e3fa7e1b424916d56442 /Documentation
parentc37cc2d725a496551113f4ebb1d116823eb0dbd1 (diff)
downloadbarebox-d71573a006a2fc2b83c076c556b88166f4e3dec3.tar.gz
barebox-d71573a006a2fc2b83c076c556b88166f4e3dec3.tar.xz
add gdb helper scripts to load barebox symbols
Add a gdb script with two helper functions which use the new pbl_barebox_break symbol to calculate the current barebox load address on the device and loads a barebox ELF file to this address. Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/user/debugging.rst21
-rw-r--r--Documentation/user/user-manual.rst1
2 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/user/debugging.rst b/Documentation/user/debugging.rst
new file mode 100644
index 0000000000..15cb439043
--- /dev/null
+++ b/Documentation/user/debugging.rst
@@ -0,0 +1,21 @@
+Debugging with OpenOCD
+======================
+
+Barebox can be configured to break on prebootloader and main barebox entry. This
+breakpoint can not be resumed and will stop the board to allow the user to
+attach a JTAG debugger with OpenOCD. Additionally, barebox provides helper
+scripts to load the symbols from the ELF binaries.
+The python scripts require `pyelftools`.
+To load the scripts into your gdb session, run the following command in the
+barebox directory:
+
+.. code-block:: none
+
+ (gdb) source scripts/gdb/helper.py
+
+This makes two new commands available in gdb, `bb-load-symbols` and
+`bb-skip-break`. `bb-load-symbols` can load either the main `barebox` file or
+one of the .pbl files in the image directories. The board needs to be stopped in
+either the prebootloader or main barebox breakpoint, and gdb needs to be
+connected to OpenOCD. To continue booting the board, `bb-skip-break` jumps over
+the breakpoint and continues the barebox execution.
diff --git a/Documentation/user/user-manual.rst b/Documentation/user/user-manual.rst
index 516b760b1b..f04981c3f0 100644
--- a/Documentation/user/user-manual.rst
+++ b/Documentation/user/user-manual.rst
@@ -33,6 +33,7 @@ Contents:
system-reset
state
random
+ debugging
* :ref:`search`
* :ref:`genindex`