DACCVIOL hardfault when performing memcpy from Internal Flash to RAM greater than 432 bytes

[suhaibish]

Hi! I want to copy data from internal flash to a statically allocated buffer in RAM. I get a DACCVIOL hard fault try to do this by memcpy. The hard fault depends on the number of bytes I try to memcpy however- 432 is the exact maximum number of bytes I can use. I don't have read protection enabled, and I tried performing a memcpy of smaller size which covers the addresses that gave me the fault- this worked. It therefore seems to be size related- Why might this be?

[Susheel Nuguru]

What address space are you using for the destination?  Can you step in disassembly to see if this is the store instruction that caused the fault? if so, we can take it that sets the size to 432 is writing to the secure memory location. The question will be then to see what configured that address space as secure.

[suhaibish]

I have root caused the issue- it is because the automatic variables were using too much stack space, causing a stack guard violation.