Compiler/TMS570LS0914: prefetch entry

Aron Püsche

Tool/software: TI C/C++ Compiler

Hello,

during debuggin on a TMS570LS0914 custom board i got a prefetch entry. IFSR value is 0xD, it means a permission error. And the Instruction Fault Address Register (IFAR) is 0xFFFFFFFE.

I check using memory browser at address 0xFFFFFFFE. It is the System Software Interrupt Flag Register.

Any ideas on how to solve this problem please?

Kind regards

Aron

over 6 years ago

0 Sunil Oak over 6 years ago

TI__Mastermind 49120 points

Hello Aron,

This address is part of the memory map that is not executable, so the permission fault is valid. The main issue to resolve is why the CPU tried to fetch an instruction from this address. I would suspect a stack overflow issue, where the return address got overwritten with this value.

Can you also post a screenshot of the other CPU registers for the abort mode?

Regards, Sunil

0 Aron Püsche over 6 years ago in reply to Sunil Oak

Prodigy 100 points

0 Sunil Oak over 6 years ago in reply to Aron Püsche

TI__Mastermind 49120 points

Thanks. Can you please also include SPSR_abt?

0 Aron Püsche over 6 years ago in reply to Sunil Oak

Prodigy 100 points

0 Sunil Oak over 6 years ago in reply to Aron Püsche

TI__Mastermind 49120 points

This shows that the exception occurred when the CPU was processing a service routine for an IRQ. Please check the size of stack allocated for IRQ mode. Do you have an ISR that declares local variables? These use stack (for temporary storage). You can increase the available IRQ stack to see if that helps.

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Compiler/TMS570LS0914: prefetch entry