From 2d67f7865213168df528ed3a7e0ddf029f393e62 Mon Sep 17 00:00:00 2001 From: Ahmad Fatoum Date: Tue, 12 Nov 2019 10:19:52 +0100 Subject: 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 Signed-off-by: Sascha Hauer --- Documentation/boards/stm32mp.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'Documentation') diff --git a/Documentation/boards/stm32mp.rst b/Documentation/boards/stm32mp.rst index f93ec04eb0..6d97b0d6d4 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 -- cgit v1.2.3