How to boot code from Sector 5 on Nucleo-F446RE after reset?

[Shreayas_Acharaya]

I'm using a Nucleo-F446RE board and have successfully flashed my application code to Sector 5 of the internal flash memory. The code runs correctly right after flashing, but it does not run after a reset or power cycle.

It seems the MCU still boots from the default start address (Sector 0), and doesn't automatically jump to Sector 5.

:question_mark:My main questions are:

1. How can I make the STM32F446RE boot from Sector 5 after every reset?

2. Is it necessary to place a custom bootloader at Sector 0 that manually jumps to the application code at Sector 5?

3. Is there any other way?

Any guidance would be very helpful.

Thanks!

[mƎALLEm]

Hello,

Did you set the vector table according to that new address?

Did you update the linker file according to that new address?

[Shreayas_Acharaya]

Yes i done these steps:

[mƎALLEm]

And if you use the default address: 0x0800000, do you have the same behavior?

[Shreayas_Acharaya]

No, with 0x0800000 it works fine.

[Shreayas_Acharaya]

Another thing to note:

• In debug mode, when I hit "Resume", the code runs as expected.

• But if I hit "Reset", it doesn't run and shows a message like “No resource preset” or gets stuck.
  
  
  

• 

[Shreayas_Acharaya]

FYI:
I placed the code succesfully @sector5 (i.e., 0x08020000) , but it runs only once , after reset it doesn't run.

[STOne-32 · Accepted solution]

Dear @Shreayas_Acharaya ,

You can not boot at sector5 on this product, impossible , it is hardware coded to either Flash sector 0 or ST system memory boot .

So, if you want to do that , you need to program a Jump code from Sector 0 to sector 5, therefore programming First boot sector at 0x0800-0000. When using debugger , the debug is forcing that jump automatically but this will not happen at standalone after cold reset.

Cheers,

STOne-32