Bootloader or External Loader for STM32U5G9

[Jtron.11]

I am looking for some advices for my product using STM32U5G9 MCU with external QSPI Flash.

I want to create a bootloader for my product but I stuck at the approach how-to:

1. Can the boot loader support the external loader meaning also update the external flash data if there is any updates for my GUI information?

2. If the boot loader can't support the loading for the external flash, do I need to implement the external loader on the application layer?

Is there any application note for case#1 if it is possible?

Thank you so much for your advices.

[Imen.D]

Hello @Jtron.11 ,

To update external flash data, you need to implement a custom bootloader that can be designed to handle the requirements of your application, including updating external QSPI Flash memory.

You can develop a custom loader referring to these resources that will help you implement the required functionality:

• AN4760: This application note explains how to create and add a custom Quad-SPI Flash memory loader for the STM32 ST-LINK utility.
• X-CUBE-EXTBOOT - Programming an external Flash memory using the UART bootloader built-in STM32 microcontrollers, software expansion for STM32Cube (AN4852) - STMicroelectronics

I recommend you checking the External QSPI loader Mooc, it might help you.