Why stm32f2 bootloader check application always failed?

[dming.4]

Hello:

I use this to check the address is application in stm32f207VET6.

void go2APP(void) {
  uint32_t JumpAddress;
  pFunction Jump_To_Application;
 
  //Check
  if (((*(__IO uint32_t*) FLASH_APP_ADDR) & 0x2FFE0000) == 0x20000000) {
    printf("APP Start...\n");
    HAL_Delay(100);
    // Jump to user application //
    JumpAddress = *(__IO uint32_t*) (FLASH_APP_ADDR + 4);
    Jump_To_Application = (pFunction) JumpAddress;
    // Initialize user application's Stack Pointer //
    __set_MSP(*(__IO uint32_t*) FLASH_APP_ADDR);
    Jump_To_Application();
  } else {
	  printf("No APP found!!!\n");
  }
}

When i erase the whole chip i get this

 

But when i use jflash to program an application hex to the application address

I get this

Even i use the flash base address to check but also get 0x20020000 .

Should i change the 0x2FFE0000 to 0x2FFD0000 ?

Thank you

[TDK]

Why do you think that check should pass?

If you’re trying to test if it’s something other than 0xFFFFFFFF just do that instead.

[dming.4]

/

[dming.4]

you should see the second picture before you type something.

My question is why i flash the application to the 0x8008000 but could not pass the check.

[Tesla DeLorean · Accepted solution]

Perhaps just mask with 0xFFF00003, all the test is doing is ensuring that the stack pointer is in RAM, it is a crude test, and perhaps a hold-over from parts with smaller memories. Keil doesn't place it at the end of memory, but at the end of the allotted space the linker knows about. GNU/GCC typically places it at the top-of-RAM, but a lot of ST scripts are defective and use an unaligned address. The address pre-decrements, so you can park it just beyond, ie for 128KB system you use 0x20020000, and not 0x2001FFFF

[TDK]

Okay, good luck.