STM32F4x App not starting

[vibr77]

Hello,
Thanks for supporting tinyUF2.

I have a STM32F411 with the tinyUF2 boot loader successfully installer.
the device enters in USB mode with double tap on RST button and using UART I can see logs.

I have an application firmware that is correctly working without tinyUF2. but it is not starting with UF2 format.

I have done the following :

• modified system_stm32f4xx.c:

add #define USER_VECT_TAB_ADDRESS
changed #define VECT_TAB_OFFSET 0x00010000U

changed the linker file STM32F411CEUx_FLASH.ld:

MEMORY { RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K - 4 /* reserve 4 bytes for double tap */ FLASH (rx) : ORIGIN = 0x08010000, LENGTH = 448K /* must match BOARD_FLASH_APP_START */ CONFIG (rx) : ORIGIN = 0x08008000 - 1024, LENGTH = 1024 }

I use the following command to build a UF2 file based on the HEX file

python3 uf2conv.py -c -b 0x08010000 -f 0x57755a57 firmware.hex -o ./build/firmware.UF2

Then I upload the firmware.UF2 over USB file drap & drop.

I can see in the UART the upload and as well the handover to the App but after that nothing. it is the same with the blinking demo app.

How could I solve this ? What do I need to check ?

I have to admit that I am a bit lost

Attached the boot loader & app file UF2
AppleIISDiskII_stm32f411.UF2.zip
tinyuf2-stm32f411ce_blackpill.elf.zip

[hathach]

it is probably due to the VTOR is set to 0x0 by system_stm32xxx.c try to add this line to your main() https://github.com/adafruit/tinyuf2/pull/419/files#diff-19aa9dc949d3bb8855bb23418f05fc68134dcbc6a74aa6a63a4f311d8a3adc45R67 . I will revise and add blinky app for testing for this port later.