From: Ahmad Fatoum <ahmad@a3f.at>
To: barebox@lists.infradead.org
Subject: [PATCH] Documentation: boards: stm32mp: document boot mode strap pins
Date: Wed, 30 Oct 2019 10:27:31 +0100 [thread overview]
Message-ID: <20191030092731.7154-1-ahmad@a3f.at> (raw)
The evaluation kits have 2P DIP-Switches for boot mode selection.
Document them.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
---
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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next reply other threads:[~2019-10-30 9:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-30 9:27 Ahmad Fatoum [this message]
2019-11-04 8:05 ` Sascha Hauer
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