Hi, I'm developing my project on a custom stm32mp135 board, baremetal. I tried to flash my FSBL into eMMC with the external loaders provided with Cube package for STM32MP13XX_CUSTOM_HW, it didn't work. Then I tried one that is provided for STM32MP135...

I modified an FSBL example to get to the root of the problem (everything else being as in the example).   volatile int rrr = 0; void SGI0_IRQHandler(void) { while (1) { rrr++; }; } int main() { HAL_Init(); SystemClock_Config(); ...