XIP (Execute-In-Place) from external QSPI flash on the STM32U5G9
Hello,
I am working on a requirement involving XIP (Execute-In-Place) from external QSPI flash on the STM32U5G9 and am encountering an issue executing the application from external flash.
I have developed a working external flash loader for my QSPI memory and successfully programmed a simple GPIO toggle application into external flash.
In the bootloader, I initialize the QSPI interface, configure the flash in memory-mapped mode, and then jump to the application located at 0xA0000000.
Using the debugger, I can confirm that execution reaches the application's Reset_Handler at 0xA00002B4. However, when executing the very first assembly instruction, the processor enters HardFault_Handler at 0xA0000458.
The fault status registers indicate:
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CFSR = 0x00000001 (Instruction Access Violation)
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HFSR = 0x40000000 (Forced HardFault)
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MPU is disabled
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VTOR = 0xA0000000
I have also verified that the application vector table contains valid stack-pointer and reset-handler addresses, and that the external flash contents can be read correctly through the debugger.
I am unable to determine why XIP execution is failing despite the QSPI memory-mapped interface appearing to work correctly.
Has anyone encountered a similar issue or have any suggestions on what I should check?
I would be happy to share my bootloader and application code for further review if needed.
Thank you in advance for your help.
Naga.
