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Re: GDB --> Parallel Port --> Target??
- From: Andrew Batchelor <A dot C dot Batchelor-99 at student dot lboro dot ac dot uk>
- To: Jim Blandy <jimb at redhat dot com>
- Cc: GDB Newsgroup <gdb at sources dot redhat dot com>
- Date: 08 Oct 2003 14:46:23 +0100
- Subject: Re: GDB --> Parallel Port --> Target??
- References: <1065520908.1048.276.camel@And.Linux> <vt2ad8dt3ms.fsf@zenia.home>
On Tue, 2003-10-07 at 17:27, Jim Blandy wrote:
> Andrew Batchelor <A.C.Batchelor-99@student.lboro.ac.uk> writes:
>
> > Hello,
> >
> > I was wondering how straightforward it would be to write an extension
> > for GDB to use the parallel port to connect to a target instead of the
> > serial port? (Changing only a few files? Many files? Which ones?,
> > etc.)
> >
> > Now I'm not really very familiar with GDB and before I jump in at the
> > deep end, I was wondering if any of you guys could give me any pointers?
> > At the moment I'm just having a read through the User Manual and the
> > Internals Manual and looking at some of the C files that look like they
> > might be of some help - can any of you guys point me in the right
> > direction?
> >
> > Any help or advice you could offer would be much appreciated.
Hi Jim,
Thanks for your reply.
> If it turns out that doesn't work because the parallel device needs
> special handling, that can be done pretty easily.
> Someone asked about this regarding USB recently:
>
> http://sources.redhat.com/ml/insight/2003-q4/msg00016.html
Ah, that all looks more like what I'm after.
> Oddly enough, it seems like someone was thinking about this at some
> point. In serial.c:
[.....]
> But this is just parsing what comes after "target remote". So "target
> remote lpt" would try to find a serial interface named "parallel".
> But there is no code I could find that registered an interface by that
> name, so the open would fail.
Yeah, I couldn't find anything either.
Looks like I need to have a stab at writing something myself:
Can I check the flow of things?
1) Create new serial_ops structure pointing to initialise functions,
etc.
2) Then call this serial_add_interface to register the new structure.
3) Add a new case to serial_open in serial.c for argument parsing to
'target remote'.
I may need to do some protocol conversion from the Remote Serial
Protocol to something else.
Could you offer any advice on this?
Andy