> I don't know the processor but made a few of these on the 68000 years
> ago. :-)
>
>
> http://www.microchip.com/forums/m546064-print.aspx
>
> // These are the available exception code values that may appear in the
> 'Cause'
> // register's ExcCode field which gets read during a general exception
> error.
> // Refer to the MIPS 32 M4K processor Core Software User's Manual for mor=
e
> // information on this.  'static' is used in this case because an
> exception
> // condition might stop 'auto' variables from being created
>
> http://www.mips.com/products/cores/32-64-bit-cores/mips32-m4k/
> http://www.mips.com/secure-download/index.dot?product_name=3D/auth/MD0024=
9%2D2B%2DM4K%2DSUM%2D02.03.pdf
>
> 4.8.8 Bus Error Exception --- Instruction Fetch or Data Access
> A bus error exception occurs when an instruction or data access makes a
> bus request and that request terminates in an
> error. The bus error exception can occur on either an instruction fetch
> or a data access. Bus error exceptions that occur
> on an instruction fetch have a higher priority than bus error exceptions
> that occur on a data access.
> Bus errors taken on any external access on the M4K core are always
> precise.
> Cause Register ExcCode Value:
> IBE: Error on an instruction reference
> DBE: Error on a data reference
> Additional State Saved:
> None
> Entry Vector Used:
> General exception vector (offset 0x180)
>

Thanks! The exception seems to be happening in vfprintf. It's being called
from my line saying:

  fprintf(DisplayStream,"%s\r\ns/n
%s\r\n",ModelString,SystemData.SerialNumber);


The two strings look good in the debugger before calling this.

I'll keep banging on it.

Thanks!

Harold




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