.. zephyr:board:: stm32mp257f_dk Overview ******** The STM32MP257F-DK Discovery kit is designed as a complete demonstration and development platform for the STMicroelectronics STM32MP257F microprocessor based on Arm |reg| dual-core Cortex |reg|-A35 (1.5 GHz) and Cortex |reg|-M33 (400 MHz), and the STPMIC25 companion chip. Zephyr OS is ported to run on the Cortex |reg|-M33 core, as a coprocessor of the Cortex |reg|-A35 core. Features: ========= - STM32MP257FAI3 microprocessor featuring dual-core Arm |reg| Cortex |reg|-A35, a Cortex |reg|-M33 in a VFBGA424 package - ST power management STPMIC25 - 32‑Gbit LPDDR4 DRAM - 64-Gbit eMMC v5.1 - 1‑Gbit/s Ethernet (RGMII) - Two USB 2.0 high speed - USB 3.0 SuperSpeed PD (DRP/DRD) - Wi‑Fi® 802.11b/g/n - Bluetooth® LE - Four user LEDs - Two user, one tamper, and one reset push-buttons - Wake-up button - Four boot pin switches - Board connectors: - Ethernet RJ45 - Two stacked USB 2.0 HS Type-A - USB 3.0 USB Type-C |reg| PD - microSD |trade| card holder - Dual-lane MIPI CSI-2 |reg| camera module expansion connector - HDMI |reg| - LVDS - GPIO expansion connector - VBAT for power backup - On-board STLINK-V3EC: - Debugger with USB re-enumeration capability: Virtual COM port and debug port - Board power source through USB Type-C |reg| - Mainlined open-source Linux |reg| STM32 MPU OpenSTLinux Distribution and STM32CubeMP2 software with examples - Linux |reg| Yocto project |reg|, Buildroot, and STM32CubeIDE as development environments More information about the board can be found at the `STM32MP257F-DK website`_. Hardware ******** - Cores - 64-bit dual-core Arm |reg| Cortex |reg|-A35 with 1.5 GHz max frequency - 32-bit Arm |reg| Cortex |reg|-M33 with FPU/MPU, Arm |reg| TrustZone |reg|, and 400 MHz max frequency - Memories - External DDR memory up to 4 Gbytes - 808-Kbyte internal SRAM - Two octo-spi memory interfaces - Flexible external memory controller with up to 16-bit data bus - Power - STPMIC25 for voltage regulation (multiple buck/LDO regulators) - USB-C power input - Clock management - 32.768 kHz LSE crystal - 40 MHz HSE crystal - Internal 64 MHz HSI oscillator - Internal 4 MHz CSI oscillator - Internal 32 kHz LSI oscillator - Five separate PLLs with integer and fractional mode - Security/Safety - Secure boot, TrustZone |reg| peripherals, active tamper, environmental monitors, display secure layers, hardware accelerators - Complete resource isolation framework - Connectivity - 1x Gigabit Ethernet (RGMII) - USB 2.0 High-Speed Host (dual-port) - USB Type-C |reg| DRP - GPIO expansion connector - Display & Camera - LVDS interface (4-lane) - Camera CSI-2 interface (2-lane) - Debug - STLINK-V3EC (onboard debugger with VCP, JTAG and SWD) More information about STM32MP257F can be found here: - `STM32MP257F on www.st.com`_ Supported Features ================== .. zephyr:board-supported-hw:: Connections and IOs =================== STM32MP257F-DK Discovery kit schematic is available here: `STM32MP257F-DK Discovery kit schematics`_ System Clock ============ Cortex |reg|-A35 ---------------- Not yet supported in Zephyr. Cortex |reg|-M33 ---------------- The Cortex |reg|-M33 Core is configured to run at a 400 MHz clock speed. Programming and Debugging ************************* .. zephyr:board-supported-runners:: Prerequisite ============ Before you can run Zephyr on the STM32MP257F-DK Discovery kit, you need to set up the Cortex |reg|-A35 core with a Linux |reg| environment. The Cortex |reg|-M33 core runs Zephyr as a coprocessor, and it requires the Cortex |reg|-A35 to load and start the firmware using remoteproc. One way to set up the Linux environment is to use the official ST OpenSTLinux distribution, following the `Starter Package`_. (more information about the procedure can be found in the `STM32MPU Wiki`_) Loading the firmware ==================== Once the OpenSTLinux distribution is installed on the board, the Cortex |reg| -A35 is responsible (in the current distribution) for loading the Zephyr firmware image in DDR and/or SRAM and starting the Cortex |reg| -M33 core. The application can be built using west, taking the :zephyr:code-sample:`blinky` as an example. .. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: stm32mp257f_dk/stm32mp257fxx/m33 :goals: build The firmware can be copied to the board file system and started with the Linux remoteproc framework. (more information about the procedure can be found in the `STM32MP257F boot Cortex-M33 firmware`_) Debugging ========= Applications can be debugged using OpenOCD and GDB. The OpenOCD files can be found at `device-stm-openocd`_. The firmware must first be started by the Cortex |reg|-A35. The debugger can then be attached to the running Zephyr firmware using OpenOCD. - Build the sample: .. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: stm32mp257f_dk/stm32mp257fxx/m33 :goals: build - Copy the firmware to the board, load it and start it with remoteproc (`STM32MP257F boot Cortex-M33 firmware`_). The orange LED should be blinking. - Attach to the target: .. code-block:: console $ west attach References ========== .. target-notes:: .. _STM32MP257F-DK website: https://www.st.com/en/evaluation-tools/stm32mp257f-dk.html#overview .. _STM32MP257F-DK Discovery kit User Manual: https://www.st.com/resource/en/user_manual/um3385-discovery-kit-with-stm32mp257f-mpu-stmicroelectronics.pdf .. _STM32MP257F-DK Discovery kit schematics: https://www.st.com/resource/en/schematic_pack/mb1605-mp257f-c01-schematic.pdf .. _STM32MP25xC/F Discovery kit datasheet: https://www.st.com/resource/en/datasheet/stm32mp257c.pdf .. _STM32MP257F on www.st.com: https://www.st.com/en/microcontrollers-microprocessors/stm32mp257f.html .. _STM32MP257F reference manual: https://www.st.com/resource/en/reference_manual/rm0457-stm32mp25xx-advanced-armbased-3264bit-mpus-stmicroelectronics.pdf .. _STM32MP257F boot Cortex-M33 firmware: https://wiki.st.com/stm32mpu/wiki/Linux_remoteproc_framework_overview#Remote_processor_boot_through_sysfs .. _Starter Package: https://wiki.stmicroelectronics.cn/stm32mpu/wiki/STM32MP25_Discovery_kits_-_Starter_Package .. _STM32MPU Wiki: https://wiki.st.com/stm32mpu/wiki/Main_Page .. _device-stm-openocd: https://github.com/STMicroelectronics/device-stm-openocd/tree/main