The STM32MP Evaluation Kits place a LED on PA13 to display boot status.
Document its blinking patterns.
Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
Documentation/boards/stm32mp.rst | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/Documentation/boards/stm32mp.rst b/Documentation/boards/stm32mp.rst
index f93ec04eb04d..6d97b0d6d4a2 100644
--- a/Documentation/boards/stm32mp.rst
+++ b/Documentation/boards/stm32mp.rst
@@ -81,3 +81,13 @@ pulled down and BOOT0 and BOOT2 are connected to a 2P DIP
switch::
BOOT2 | O --O |
BOOT0 | N --O | <---- DFU on UART and USB OTG
+-------+
+
+Boot status indicator
+---------------------
+
+The ROM code on the first Cortex-A7 core pulses the PA13 pad.
+An error LED on this pad can be used to indicate boot status:
+
+* **Boot Failure:** LED lights bright
+* **UART/USB Boot:** LED blinks fast
+* **Debug access:** LED lights weak
--
2.24.0.rc1
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