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125 lines
4.1 KiB
125 lines
4.1 KiB
STMicroelectronics STM32MP1
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===========================
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STM32MP1 is a microprocessor designed by STMicroelectronics
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based on a dual Arm Cortex-A7.
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It is an Armv7-A platform, using dedicated code from TF-A.
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The STM32MP1 chip also embeds a Cortex-M4.
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More information can be found on `STM32MP1 Series`_ page.
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Design
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------
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The STM32MP1 resets in the ROM code of the Cortex-A7.
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The primary boot core (core 0) executes the boot sequence while
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secondary boot core (core 1) is kept in a holding pen loop.
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The ROM code boot sequence loads the TF-A binary image from boot device
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to embedded SRAM.
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The TF-A image must be properly formatted with a STM32 header structure
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for ROM code is able to load this image.
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Tool stm32image can be used to prepend this header to the generated TF-A binary.
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At compilation step, BL2, BL32 and DTB file are linked together in a single
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binary. The stm32image tool is also generated and the header is added to TF-A
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binary. This binary file with header is named tf-a-stm32mp157c-ev1.stm32.
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It can then be copied in the first partition of the boot device.
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Memory mapping
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~~~~~~~~~~~~~~
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::
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0x00000000 +-----------------+
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| | ROM
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0x00020000 +-----------------+
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| ... |
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0x2FFC0000 +-----------------+ \
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| ... | |
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0x2FFD8000 +-----------------+ |
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| TF-A DTB | | Embedded SRAM
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0x2FFDC000 +-----------------+ |
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| BL2 | |
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0x2FFEF000 +-----------------+ |
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| BL32 | |
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0x30000000 +-----------------+ /
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| ... |
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0x40000000 +-----------------+
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| | Devices
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0xC0000000 +-----------------+ \
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0xC0100000 +-----------------+ |
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| BL33 | | Non-secure RAM (DDR)
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| ... | |
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0xFFFFFFFF +-----------------+ /
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Boot sequence
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~~~~~~~~~~~~~
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ROM code -> BL2 (compiled with BL2_AT_EL3) -> BL32 (SP_min) -> BL33 (U-Boot)
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or if Op-TEE is used:
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ROM code -> BL2 (compiled with BL2_AT_EL3) -> OP-TEE -> BL33 (U-Boot)
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Build Instructions
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------------------
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Boot media(s) supported by BL2 must be specified in the build command.
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Available storage medias are:
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- ``STM32MP_SDMMC``
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- ``STM32MP_EMMC``
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- ``STM32MP_RAW_NAND``
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- ``STM32MP_SPI_NAND``
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- ``STM32MP_SPI_NOR``
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To build with SP_min and support for all bootable devices:
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.. code:: bash
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make CROSS_COMPILE=arm-linux-gnueabihf- PLAT=stm32mp1 ARCH=aarch32 ARM_ARCH_MAJOR=7 AARCH32_SP=sp_min STM32MP_SDMMC=1 STM32MP_EMMC=1 STM32MP_RAW_NAND=1 STM32MP_SPI_NAND=1
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STM32MP_SPI_NOR=1 DTB_FILE_NAME=stm32mp157c-ev1.dtb
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cd <u-boot_directory>
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make stm32mp15_trusted_defconfig
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make DEVICE_TREE=stm32mp157c-ev1 all
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To build TF-A with OP-TEE support for all bootable devices:
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.. code:: bash
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make CROSS_COMPILE=arm-linux-gnueabihf- PLAT=stm32mp1 ARCH=aarch32 ARM_ARCH_MAJOR=7 AARCH32_SP=optee STM32MP_SDMMC=1 STM32MP_EMMC=1 STM32MP_RAW_NAND=1 STM32MP_SPI_NAND=1 STM32MP_SPI_NOR=1 DTB_FILE_NAME=stm32mp157c-ev1.dtb
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cd <optee_directory>
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make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm PLATFORM=stm32mp1 CFG_EMBED_DTB_SOURCE_FILE=stm32mp157c-ev1.dts
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cd <u-boot_directory>
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make stm32mp15_optee_defconfig
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make DEVICE_TREE=stm32mp157c-ev1 all
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The following build options are supported:
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- ``ENABLE_STACK_PROTECTOR``: To enable the stack protection.
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Populate SD-card
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----------------
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The SD-card has to be formated with GPT.
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It should contain at least those partitions:
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- fsbl: to copy the tf-a-stm32mp157c-ev1.stm32 binary
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- ssbl: to copy the u-boot.stm32 binary
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Usually, two copies of fsbl are used (fsbl1 and fsbl2) instead of one partition fsbl.
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.. _STM32MP1 Series: https://www.st.com/en/microcontrollers-microprocessors/stm32mp1-series.html
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