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how to trace unexpected fiq source?

WatterCutter

since the processor been powered up with EL3, AARCH64,

its pc jump to vector table fiq(offset 0x200)

but no outter interrupt signal was set,

  • how could I trace the interrupt source?
  • is there any possible for an instruction error to cause fiq?

even though this fault could be neglected by setting DAIF[1:0] as 2'b11,

what I need is finding out the cause.

thanks.

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