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Date: Wed, 26 Jan 2005 14:22:16 -0800 (PST)
From: annamaya <annamaya@yahoo.com>
To: Dan Malek <dan@embeddededge.com>, Mark Chambers <markc@mail.com>
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Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Is there a DER for the MPC82xx?
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Dan and Mark,

Thanks for talking about this a little more and making
it a much clearer for me. I do have VECTOR CATCH
enabled. I am going to keep my fingers crossed. :-)


--- Dan Malek <dan@embeddededge.com> wrote:

> 
> On Jan 26, 2005, at 12:33 PM, Mark Chambers wrote:
> 
> > P.S. I've read the BDI manual - I don't see it. 
> My manual
> > says the BDI can only set one hardware breakpoint,
> and
> > stuff like VECTOR CATCH assumes valid memory.
> 
> The BDI2000 lets you set as many hardware
> breakpoints
> as the processor supports.  The VECTOR CATCH is
> equivalent
> to setting of the bits in the DER.  I don't know
> where you
> determined it requires valid memory, as it catches
> the vector
> before it starts to execute the instructions in the
> trap handler.
> I don't know the COP details, there may be versions
> that don't
> have sufficient hardware support, and in that case
> it would
> have to be implemented by stuffing breakpoints into
> all of
> the vector tables, but that is just speculation on
> my part and
> have never seen that done.  I've used VECTOR CATCH
> on
> 603 cores and had it trap properly before memory was
> initialized.
> Using VECTOR CATCH seems to have no effect on
> setting
> other breakpoints.
> 
> Yes, you can manually set bits in the DER and get a
> different
> control over the debugging environment, but you have
> to
> be conscious of what the BDI2000 is also trying to
> do with
> that and other debug registers, too :-)
> 
> 
> 	-- Dan
> 
> 



		
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