Cortex M4 Hardfault in PendSV during initial bringup

[RAc]

This looks somewhat like the entry for your pending SVC handler in the ISR points to something that is not “naked,” meaning the compiler wraps the ISR into something that unwantedly saves/restores registers. That’s a no no for the service handler. Can you post your startup code as well as the declaration of your service ISR?

Edit: Something similar has been discussed here:

FreeRTOS example for small memory footprint

That may cause problems because compiler may generate epilogue and prologue while the definitions of xPortPendSVHandler and vPortSVCHandler are naked functions to be installed as ISRs. Try the following: Delete the definitions of SVC_Handler and PendSV_Handler from stm320xx_it.c. Enable the following in FreeRTOSConfig.h: #define vPortSVCHandler SVC_Handler #define xPortPendSVHandler PendSV_Handler In addition, you should use some other timer as HAL Timebase (CubeMX should have g…