[Efi332] BDM troubles

[Doug Brunner]

My problems have been with GDB's support for the BDM interface. I'm 
actually using the Phytec board's internal BDM (parallel port on the 
board) rather than the 10-pin header for an external BDM, since my only 
BDM is a Tilbury unit from way back when that has been more than a 
little flaky.

As I understand it, GDB needs some kind of addon to talk to a BDM via 
the parallel port. I've tried MPCBDM as discussed on James' 555 Webpage, 
running gdb 5.0 (since that's the only version I've seen the patch for) 
as root, and it doesn't seem to accomplish anything--it just hangs when 
I try to connect to the board. What has everyone else been using?

       --Doug Brunner

Paul Helmuth wrote:

> I'm (reasonably) sure everyone that has done anything with the Phytec 
> development board has used the JTAG/BDM port.
>
> Since you are using GDB, I assume that you are using the GCC tool 
> chain. Since you are using that, I also assume that you are using the 
> external BDM port. This means you have some BDM port interface (like a 
> Wiggler).
>
> So - you need to make sure that all of your pin-outs match between 
> your BDM interface and the Phytec BDM port. As an example, two of the 
> pins are reversed between the Phytec port and my Macraigor Wiggler. I 
> have a note on James' 555 web page about that switch. Also, you need 
> to follow Phytec's bulletin on setting the development board jumpers 
> for using the external BDM port.
>
> Other than that, everything should work - but I haven't used these 
> tools with Linux.
>
> -Paul
>
>
> ----- Original Message ----- From: "Doug Brunner" <doug at udel.edu>
> To: <efi332 at diy-efi.org>
> Sent: Friday, July 01, 2005 10:11 PM
> Subject: [Efi332] BDM troubles
>
>
>> I'm trying to start talking to my Phytec 555 board and having lots of 
>> trouble. It's on the Phytec development board, so I'm using their 
>> BDM, which I can't get GDB to interact with. I'm running all this 
>> under Linux.
>>
>> What have the rest of you been using for BDM support?
>>
>>       --Doug Brunner
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