Hi there.
As usual, I'm there with a new issue... 😅
Developing a custom Bootloader, I'm trying to disable both Instruction and Data chaches.
As I read on the ST AN4839, before deactivating the DCache, I would also Clean it.
No problem with the Icache, but I'm experiencing Hard Fault adding Dcache cleaning and/or disabling.
void DoJump2App(u32t uiAPPaddress)
{
/*.-.-.| Local Varibles |.-.-.*/
/*.-.-.| Execution |.-.-.*/
SCB_DisableICache();
SCB_CleanDCache();
SCB_DisableDCache();
uiResetKey = RESET_DRV_BTL_KEY; // Clear RESET key
pJump2App = (pFunction)(*(volatile u32t*)(uiAPPaddress + 4));
__set_MSP(*(volatile u32t*)uiAPPaddress); // Initialize user application's Stack Pointer
__ISB(); // Instruction Synchronization Barrier
pJump2App();
}
Above the example of the routine I'm testing.
To be noticed that:
- This routine is called just once in the main program after peripheral initialization (inside a more complex wrapping function)
- Cache memories are enabled in the main (as usual)
- If I move SCB_DisableDCache() and/or SCB_CleanDCache() functions call directly in the main program, prior this function, there is no problem...
What I'm mistaking?
Context: I'm working on a custom board quipped with an STM32H755BIT MCU, using CubeIDE 1.13.2, CubeMX6.9.2 and Firmware package STM32Cube FW_H7 V1.11.0
Thanks in advance for your support!
iTTy
