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- STM32 MPUs
- ==========
- STM32 MPUs are microprocessors designed by STMicroelectronics
- based on Arm Cortex-A. This page presents the common configuration of STM32
- MPUs, more details and dedicated configuration can be found in each STM32 MPU
- page (:ref:`STM32MP1` or :ref:`STM32MP2`)
- Design
- ------
- The STM32 MPU resets in the ROM code of the Cortex-A.
- The primary boot core (core 0) executes the boot sequence while
- secondary boot core (core 1) is kept in a holding pen loop.
- The ROM code boot sequence loads the TF-A binary image from boot device
- to embedded SRAM.
- The TF-A image must be properly formatted with a STM32 header structure
- for ROM code is able to load this image.
- Tool stm32image can be used to prepend this header to the generated TF-A binary.
- Boot
- ~~~~
- Only BL2 (with STM32 header) is loaded by ROM code. The other binaries are
- inside the FIP binary: BL31 (for Aarch64 platforms), BL32 (OP-TEE), U-Boot
- and their respective device tree blobs.
- Boot sequence
- ~~~~~~~~~~~~~
- ROM code -> BL2 (compiled with RESET_TO_BL2) -> OP-TEE -> BL33 (U-Boot)
- Build Instructions
- ------------------
- Boot media(s) supported by BL2 must be specified in the build command.
- Available storage medias are:
- - ``STM32MP_SDMMC``
- - ``STM32MP_EMMC``
- - ``STM32MP_RAW_NAND``
- - ``STM32MP_SPI_NAND``
- - ``STM32MP_SPI_NOR``
- Serial boot devices:
- - ``STM32MP_UART_PROGRAMMER``
- - ``STM32MP_USB_PROGRAMMER``
- Only one storage or serial device should be selected in the build command line,
- to save space and not overflow SYSRAM size, or else the platform won't build or boot.
- Other configuration flags:
- - | ``DTB_FILE_NAME``: to precise board device-tree blob to be used.
- | Default: stm32mp157c-ev1.dtb
- - | ``DWL_BUFFER_BASE``: the 'serial boot' load address of FIP,
- | default location (end of the first 128MB) is used when absent
- - | ``STM32MP_RECONFIGURE_CONSOLE``: to re-configure crash console (especially after BL2).
- | Default: 0 (disabled)
- - | ``STM32MP_UART_BAUDRATE``: to select UART baud rate.
- | Default: 115200
- Populate SD-card
- ----------------
- Boot with FIP
- ~~~~~~~~~~~~~
- The SD-card has to be formatted with GPT.
- It should contain at least those partitions:
- - fsbl: to copy the tf-a-stm32mp157c-ev1.stm32 binary (BL2)
- - fip (GUID 19d5df83-11b0-457b-be2c-7559c13142a5): which contains the FIP binary
- Usually, two copies of fsbl are used (fsbl1 and fsbl2) instead of one partition fsbl.
- --------------
- *Copyright (c) 2023-2024, STMicroelectronics - All Rights Reserved*
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