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STMicroelectronics STM32MP
==========================
-.. note::
-
- Support for the STM32MP architecure in barebox is still in progress.
- Bootstrapping an OS from mainline barebox is not yet supported.
-
The STM32MP is a line of 32-bit ARM SoCs. They reuse peripherals of the
STM32 line of microcontrollers and can have a STM32 MCU embedded as co-processor
as well.
@@ -68,8 +63,21 @@ An appropriate image for the boot media can be generated with following
Image can then be flashed on e.g. a SD-Card.
-TODO
-----
-
-* Extend barebox MMCI support to support the SDMMC2
-* Extend barebox DesignWare MAC support to support the stmmac
+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
+ +-------+