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authorAhmad Fatoum <a.fatoum@pengutronix.de>2019-11-12 10:19:52 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2019-11-13 15:20:25 +0100
commit2d67f7865213168df528ed3a7e0ddf029f393e62 (patch)
tree6cc406d2f4d7117b5eea933e8edeb9f081b326ce /Documentation
parent76f136ddde15039b9b63f089da96905e68fe18c4 (diff)
downloadbarebox-2d67f7865213168df528ed3a7e0ddf029f393e62.tar.gz
Documentation: boards: stm32mp: document boot error LED
The STM32MP Evaluation Kits place a LED on PA13 to display boot status. Document its blinking patterns. Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/boards/stm32mp.rst10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/boards/stm32mp.rst b/Documentation/boards/stm32mp.rst
index f93ec04..6d97b0d 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