STM32 SDCARD Bootloader

The purpose of this project is to reduces hardware uploading program time by using SDCARD. As in linux devkit, they often use SDCARD or MMC memory to storage image for booting.

Specification

• Arm-gcc
• STM32F411RE Nucleo Board
  • 512kb FLASH - 8 sectors
• Micro SDCard SPI Adapter Module
• SPI2
• USART2
• Systick
• Bootloader is ~14Kb with -Os optimazation without logging

Flash sector

Address	Sector	Program
0x0800 0000	Sector 0	Bootloader
0x0800 4000	Sector 1	Bootloader
0x0800 8000	Sector 2	Bootloader
0x0800 C000	Sector 3	Side app
0x0801 0000	Sector 4	Side app
0x0802 0000	Sector 5	Side app
0x0804 0000	Sector 6	Main app
0x0806 0000	Sector 7	Main app

Bootloader program will be placed in 48Kb section, Side app is in 208 Kb section and Main app is in 256Kb section

Side App is the secondary application for backup purpose if Main app is fail

How do i use it ?

The project is written by STM32CubeIDE, so its recommended to use STM32CubeIDE.

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• Complete port.c to match your hardware
• Modify ll_serial.c to use your desired usart device
• Modify ll_flash.c to match your flash requirement
• Modify ll_spi.c to match your spi to sdcard device
• Modify user_diskio_spi.c/.h to match your fatfs communication
• Modify ffconf.h to choose fatfs configuration
• Build and upload to your hardware

If you wish to change the address of bootloader please modify MEMORY section in ./STM32F411RETX_FLASH.ld and change VECT_TAB_OFFSET in ./Core/Src/system_stm32f4xx.c

Application for bootloader

In Example folder contains example for main app and side. If you wish to modify application address, follow above steps.

Bootloader Behavior

Uploader programs

The example of uploader is in script folder.

Run python3 ./script/uploader.py -h for more information

Contribute

Feel free to help my project.