malek44 / cm7_crt0

A minimalistic implmentation of CRT0 for Cortex-M7

CM7_CRT0

A basic CRT0 like bootstrap implementation targeting Cortex-M7

The startup code basicall does:

• Initialize the system clock
• Initialize ZI regions and copy rwdata sections to RAM.
• Call the user main()

HOWTO

For demonstration purpose, an example application is supplied. It targets the STM32H723 MCU (Board NUCLEO-H723ZG) The application, led_blinker, can be compiled without any specific library or dependencies. You only need GCC (gcc-arm-none-eabi) and make. To build the application, cd to gcc folder and execute the make command. Application building will result in two binary files (ELF and raw BIN), use one of them to flash it (STM32CubeProgrammer) into target starting at address 0x08000000.

NOTES

• The system clock is drived directly from HSI (64MHz, no PLL).
• GCC used is gcc-arm-none-eabi.