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TMS320F280023-Q1: Debugger stopping in _system_post_cinit on power on start

Part Number: TMS320F280023-Q1

Hi. Using an XDS110 pod with Code Composer Studio. When I start a debug session it seems to flash ok, but then immediately stops at an ESTOP0 instruction in what the debugger says is _system_post_cinit (no source) before hitting the initial breakpoint at the start of our code. It's a proto board and the chip was just replaced, so there's probably a soldering or wiring issue, but anywhere I can get a clue on what the ESTOP0 is being vectored to for? Thanks!