Cisco Cisco IGX 8400 Modules Fehlerbehebungsanleitung

            3015 109A = program counter

            7         = stack frame type (access error)

            0 08      = vector offset (8 = bus error)

            3032 FDC0 = effective address

            0101      = special status word

            0001      = writeback 3 status

            0001      = writeback 2 status

            0001      = writeback 1 status

            A422 C388 = fault address

            3032 FDBC = writeback 3 address

            0000 000A = writeback 3 data

The most important information in this stack is the location of the abort (program counter) and the address
that cannot be accessed, which is the fault address.

You can check the Nmemmap.h file to determine if the fault address is a valid hardware register. In this
example, the address 0xA422C388 is not a valid hardware register, so the software attempts to access an
invalid address. One example of a hardware failure is the failure of one of the parallel port registers to
respond. The base address of PAR_PTS is 0xA0000000.

You can use the program counter to determine the location that the software attempts to access. The expected
assembly instruction is to move to a memory location that an address register specifies. This might not be the
instruction at the program counter because the processor reads instructions ahead of the execution of the
instructions. It has a pipelined architecture.

This instruction sequence generates a 1M3 abort error when an attempt is made to read from address 1:

        cmp.w   #1234,Abort_Now

        BNE     CK_PSOS

        move.l  #1,A0

        move.l  (A0),D0             ;generate a bus error

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Updated: Feb 02, 2007

Document ID: 10796