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1. Article purpose[edit source]
This article will help you to create a first TF-A device tree with STM32CubeMX, to bring up your board.
2. TF-A setup to get the serial log and USB boot[edit source]
- In STM32CubeMX:
- Create a new project from the MCU selector
- Select the STM32MP1 part number that is mounted on your board
- In Pinout & Configuration:
- RCC: enable the HSE according to your board setup. The HSE is needed for various PLL (USB, DDR).
- UARTx: setup the serial console.
- Assign UARTx to the "Cortex-A7 non-secure" and the "Boot loader" contexts
- Select the "Asynchronous" mode
- In the "pinout view", change the RX and TX lines if STM32CubeMX default choices are not maching with your board.
- Notice that UARTx instance is gotten from the device tree for the console but it is hard coded to UART4 with TX on GPIOG11 for the crash console, in plat/st/stm32mp1/stm32mp1_def.h.
- USB OTG: setup the serial boot interface.
- Assign USB OTG to the "Cortex-A7 non-secure", the "Boot loader" and "Boot ROM" contexts.
- Select the "High speed OTG/Dual_Role_Device".
- In Clock configuration:
- Check that UARTx source clock corresponds to your wish or select HSI by default.
- Configure the USBPHYC clock mux.
- GENERATE CODE then:
- Complete "USER CODE BEGIN root" with "chosen" and "aliases" nodes, taking ST boards values as example.