1ce7f8044SYann GautierSTM32 MPUs 2ce7f8044SYann Gautier========== 3ce7f8044SYann Gautier 4ce7f8044SYann GautierSTM32 MPUs are microprocessors designed by STMicroelectronics 5ce7f8044SYann Gautierbased on Arm Cortex-A. This page presents the common configuration of STM32 6ce7f8044SYann GautierMPUs, more details and dedicated configuration can be found in each STM32 MPU 7ee5076f9SYann Gautierpage (:ref:`STM32MP1` or :ref:`STM32MP2`) 8ce7f8044SYann Gautier 9ce7f8044SYann GautierDesign 10ce7f8044SYann Gautier------ 11ce7f8044SYann GautierThe STM32 MPU resets in the ROM code of the Cortex-A. 12ce7f8044SYann GautierThe primary boot core (core 0) executes the boot sequence while 13ce7f8044SYann Gautiersecondary boot core (core 1) is kept in a holding pen loop. 14ce7f8044SYann GautierThe ROM code boot sequence loads the TF-A binary image from boot device 15ce7f8044SYann Gautierto embedded SRAM. 16ce7f8044SYann Gautier 17ce7f8044SYann GautierThe TF-A image must be properly formatted with a STM32 header structure 18ce7f8044SYann Gautierfor ROM code is able to load this image. 19ce7f8044SYann GautierTool stm32image can be used to prepend this header to the generated TF-A binary. 20ce7f8044SYann Gautier 21ce7f8044SYann GautierBoot 22ce7f8044SYann Gautier~~~~ 23ce7f8044SYann GautierOnly BL2 (with STM32 header) is loaded by ROM code. The other binaries are 24ce7f8044SYann Gautierinside the FIP binary: BL31 (for Aarch64 platforms), BL32 (OP-TEE), U-Boot 25ce7f8044SYann Gautierand their respective device tree blobs. 26ce7f8044SYann Gautier 27ce7f8044SYann GautierBoot sequence 28ce7f8044SYann Gautier~~~~~~~~~~~~~ 29ce7f8044SYann Gautier 30ce7f8044SYann GautierROM code -> BL2 (compiled with RESET_TO_BL2) -> OP-TEE -> BL33 (U-Boot) 31ce7f8044SYann Gautier 32ce7f8044SYann GautierBuild Instructions 33ce7f8044SYann Gautier------------------ 34ce7f8044SYann GautierBoot media(s) supported by BL2 must be specified in the build command. 35ce7f8044SYann GautierAvailable storage medias are: 36ce7f8044SYann Gautier 37ce7f8044SYann Gautier- ``STM32MP_SDMMC`` 38ce7f8044SYann Gautier- ``STM32MP_EMMC`` 39ce7f8044SYann Gautier- ``STM32MP_RAW_NAND`` 40ce7f8044SYann Gautier- ``STM32MP_SPI_NAND`` 41ce7f8044SYann Gautier- ``STM32MP_SPI_NOR`` 42ce7f8044SYann Gautier 43ce7f8044SYann GautierSerial boot devices: 44ce7f8044SYann Gautier 45ce7f8044SYann Gautier- ``STM32MP_UART_PROGRAMMER`` 46ce7f8044SYann Gautier- ``STM32MP_USB_PROGRAMMER`` 47ce7f8044SYann Gautier 48*40ed77feSYann GautierOnly one storage or serial device should be selected in the build command line, 49*40ed77feSYann Gautierto save space and not overflow SYSRAM size, or else the platform won't build or boot. 50ce7f8044SYann Gautier 51ce7f8044SYann GautierOther configuration flags: 52ce7f8044SYann Gautier 53ce7f8044SYann Gautier- | ``DTB_FILE_NAME``: to precise board device-tree blob to be used. 54ce7f8044SYann Gautier | Default: stm32mp157c-ev1.dtb 55ce7f8044SYann Gautier- | ``DWL_BUFFER_BASE``: the 'serial boot' load address of FIP, 56ce7f8044SYann Gautier | default location (end of the first 128MB) is used when absent 57ce7f8044SYann Gautier- | ``STM32MP_RECONFIGURE_CONSOLE``: to re-configure crash console (especially after BL2). 58ce7f8044SYann Gautier | Default: 0 (disabled) 59ce7f8044SYann Gautier- | ``STM32MP_UART_BAUDRATE``: to select UART baud rate. 60ce7f8044SYann Gautier | Default: 115200 61ce7f8044SYann Gautier 62ce7f8044SYann Gautier 63ce7f8044SYann GautierPopulate SD-card 64ce7f8044SYann Gautier---------------- 65ce7f8044SYann Gautier 66ce7f8044SYann GautierBoot with FIP 67ce7f8044SYann Gautier~~~~~~~~~~~~~ 68ce7f8044SYann GautierThe SD-card has to be formatted with GPT. 69ce7f8044SYann GautierIt should contain at least those partitions: 70ce7f8044SYann Gautier 71ce7f8044SYann Gautier- fsbl: to copy the tf-a-stm32mp157c-ev1.stm32 binary (BL2) 72ce7f8044SYann Gautier- fip (GUID 19d5df83-11b0-457b-be2c-7559c13142a5): which contains the FIP binary 73ce7f8044SYann Gautier 74ce7f8044SYann GautierUsually, two copies of fsbl are used (fsbl1 and fsbl2) instead of one partition fsbl. 75ce7f8044SYann Gautier 76ce7f8044SYann Gautier-------------- 77ce7f8044SYann Gautier 78*40ed77feSYann Gautier*Copyright (c) 2023-2024, STMicroelectronics - All Rights Reserved* 79