[PATCH] Documentation: boards: stm32mp: document boot mode strap pins

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The evaluation kits have 2P DIP-Switches for boot mode selection.
Document them.

Signed-off-by: Ahmad Fatoum <ahmad@xxxxxx>
---
 Documentation/boards/stm32mp.rst | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/boards/stm32mp.rst b/Documentation/boards/stm32mp.rst
index d4429aae2765..f93ec04eb04d 100644
--- a/Documentation/boards/stm32mp.rst
+++ b/Documentation/boards/stm32mp.rst
@@ -62,3 +62,22 @@ An appropriate image for the boot media can be generated with following
   }
 
 Image can then be flashed on e.g. a SD-Card.
+
+Boot source selection
+---------------------
+
+The STM32MP BootROM samples three boot pins at reset. Usually BOOT1 is
+pulled down and BOOT0 and BOOT2 are connected to a 2P DIP switch::
+
+       +-------+
+ BOOT2 | O O-- |
+ BOOT0 | N O-- |  <---- SDMMC
+       +-------+
+       +-------+
+ BOOT2 | O O-- |
+ BOOT0 | N --O |  <---- QSPI-NOR Flash
+       +-------+
+       +-------+
+ BOOT2 | O --O |
+ BOOT0 | N --O |  <---- DFU on UART and USB OTG
+       +-------+
-- 
2.20.1


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