Setting up clocks on STM32U5 (Nucleo board) in startup assembler We have code which performs quite a lot of operations in C constructors. This means that, with the standard STM32U5 startup code, execution of __libc_init_array takes around 10 seconds, which is undesirable, hence we would like to set up all of the system clocks, so that the chip is running at full speed, before we get there.We have tried calling SystemCoreClockUpdate from the startup code before __libc_init_array (see code below) however that makes no difference. What might we do to bring the core up to full speed before libc is initialised?Reset_Handler: ldr sp, =_estack /* set stack pointer *//* Call the clock system initialization function.*/ bl SystemInit/* Copy the data segment initializers from flash to SRAM */ movs r1, #0 b LoopCopyDataInitCopyDataInit: ldr r3, =_sidata ldr r3, [r3, r1] str r3, [r0, r1] adds r1, r1, #4LoopCopyDataInit: ldr r0, =_sdata ldr r3, =_edata adds r2, r0, r1 cmp r2, r3 bcc
