application start address

[omaroski]

Hello,

i'm playing with stm32f407g-disc1 evaluation board and exploring the possibility to update firmware via USB host port (the micro USB one) from a USB memory stick.

From AN3990 i understand that i need to flash the smt32f4 mcu with the "firmware upgrade application" and set my application to start from memory address 0x08008000.

I modified "system_stm32f4xx.c" in the firmware upgrade application with:

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#define VECT_TAB_OFFSET  0x8000

as told in AN3990 page 11.

Connecting a usb stick with my image.bin to the micro USB and hitting the reset button i get the blue LED on which turns off after a few seconds and then the green LED turns on signaling my application has been downloaded to stm32f4.

If i check the stm32f4 memory content with CUBEprogrammer i can see that my application is effectively stored at address 0x08008000

The problem is that my application (simple LED blink) never starts, either if i press user button after download or after board hardware reset.

So i'm missing something or have done something wrong.

From this thread i've read about the build_opt.h file:
viewtopic.php?t=1611

i use STM32 core 2.5.0, the build.opt.h file is not generatated when i export the compilation, so i created it manually and added the following:

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-DVECT_TAB_OFFSET=0x00008000U

placed in the sketch folder, restart Arduino IDE 2.0 and exported the compilation.

However still my blink application won't start so there's defintely something wrong i'm doing here

Don't know if it helps but looking at my bin files with and without the build_opt.h they look the same in size

Can you help?
Thank you!

[fpiSTM]

You should update the linkerscript to change flash start adress

[omaroski]

Thank you for fast reply.

Unfortunately i don't know what linkerscript is and where i can find it. Can you help?

[omaroski]

Ok, i googled a bit and i guess the linker script is stm32_flash.ld where i can find the following:

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MEMORY
{
  FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 1024K
  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 112K
  MEMORY_B1 (rx)  : ORIGIN = 0x60000000, LENGTH = 0K
}

This is from the upgrade application firmware in stm32f4 package.

Should i change the flash to reflect my application start address?

[fpiSTM]

I would try this:

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  FLASH (rx)      : ORIGIN = 0x08008000, LENGTH = 1024K - 32k

And check if the system_stm32f4xx.c well apply the VECT_TAB_OFFSET because it is not well managed from my point of view in the template file:
https://github.com/STMicroelectronics/S ... c#L96-L111

Here you have to define USER_VECT_TAB_ADDRESS and update the VECT_TAB_OFFSET value.

[omaroski]

I've been trying to do the same thing with CubeIDE as explained in ST application note and it works fine.
From CubeIDE project i only need to change the following files:

system_stm32f4xx.c

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#define VECT_TAB_OFFSET  0x8000 /*!< Vector Table base offset field. This value must be a multiple of 0x200. */

changed VECT_TAB_OFFSET from 0 to 0x8000

stm32_flash.ld

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/* Specify the memory areas */
MEMORY
{
  FLASH (rx)      : ORIGIN = 0x08008000, LENGTH = 1024K - 32K
  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 112K
  MEMORY_B1 (rx)  : ORIGIN = 0x60000000, LENGTH = 0K
}

With Arduino currently i get multiple compiling errors when i have the build_opt.h file with

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-DVECT_TAB_OFFSET = 0x00008000U

in it. I have tried to uninstall and reinstall the stm32 core but still get the errors at compile time.

Even if i want to modify the stm32 core files to make it work i don't know which files to modify cause they look a bit different from the ones i have in CubeIDE.
Searching in in the core files there are two system_stm32f4xx.c:
hardware\stm32\2.5.0\system\STM32F4xx
https://github.com/stm32duino/Arduino_C ... tm32f4xx.c
hardware\stm32\2.5.0\system\Drivers\CMSIS\Device\ST\STM32F4xx\Source\Templates
https://github.com/stm32duino/Arduino_C ... tm32f4xx.c

the ldscript.ld file which i assume is the one in this location for STM32F407G-DISC1 board:
\hardware\stm32\2.5.0\variants\STM32F4xx\F407V(E-G)T_F417V(E-G)T
https://github.com/stm32duino/Arduino_C ... dscript.ld

[fpiSTM]

No space in the build_opt.h file

[omaroski]

ok thank you, now it doesn't spit errors at compile anymore.

However i still can't make the application start from different address.

I have the build_opt.h file with vector offset declared

and the linkerscript modified as this:

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MEMORY
{
  CCMRAM    (xrw)    : ORIGIN = 0x10000000,   LENGTH = 64K
  RAM    (xrw)    : ORIGIN = 0x20000000,   LENGTH = LD_MAX_DATA_SIZE
  FLASH    (rx)    : ORIGIN = 0x8000000 + 0x8000, LENGTH = LD_MAX_SIZE - 0x8000
}

in this last piece of code i just replaced LD_FLASH_OFFSET with desired offset.

Can you help? Thank you!

[omaroski]

ok, somehow after trying sooo many times i made it work by coyping the stm32_flash.ld file (attached) to ldscript.ld

Is there a better way of doing it without replacing core files? I'm sure there is but i can't figure it out.

[fpiSTM]

it seems some other stuff are required for your application.