Bootloader for STM32H747-DISCO to jump app present in QSPI

[Vimal126]

Hi All,

I'm trying to boot to an app present in QSPI.

I created a project from TouchGFX and generated code, same.ioc file I used to make my bootloader code.

When I used the bootloader to jump to the app that was present at address 0x0802000 it jumped successfully, and my app was running normally. Now I want to move this app completely to QSPI and want to run from there via a bootloader.

How to achieve that. I tried to move the whole application to QSPI by changing the .ld file, but not able to jump.

[Tesla DeLorean]

Your boot-loader should bring up the external memories (SDRAM, QSPI), and clocks (PLL, etc) and the Application should not repeat that.

The external memories will need all the pins initialized, and the memory-mapping enabled, so the 0xC0000000 and 0x90000000 memory spaces are visible to the MCU within it's memory-map. See also MPU configurations

You should STRONGLY avoid doing this a second time as it will be very disruptive, takes additional time, and repetitive.

With the memory suitably mapped you will be able to perform the transfer of control.

[ahsrabrifat]

You can’t execute arbitrary code directly from QSPI unless XIP is enabled and correctly configured.

STM32H7, STM32F7, STM32L4+, etc., support QSPI memory-mapped mode to allow execution directly from QSPI flash.

TouchGFX apps rely heavily on external QSPI for GUI assets, but the core code (startup, RTOS, etc.) often still runs from internal flash.