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  • Rev 815, 2012-10-04 09:52:36 GMT
  • Author: yannv
  • Log message:
    OR1200 debug unit: prevent deadlock when trap instruction stalls

    As per mailing list post <20120925160925.5725e06f@latmask.vernier.se>,
    the debug unit could deadlock with the instruction decoder if the trap
    instruction is held back by a pipeline stall. This change prevents that.

    The problem can be reproduced by placing a breakpoint at an unfavorable
    position with instruction cache enabled. In our test, this occurred
    with or1200-cbasic when placing a breakpoint at test_bss using gdb, but
    this is dependent on such factors as cache parameters and compilation
    result.

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