Re: gdb and jtag

[Quality Quorum <qqi at theworld dot com>]

Hi,



On Tue, 5 Nov 2002, Simon Berry wrote:

> Hi all
>
> Does anyone know how one would go about creating an interface/back-end to
> gdb that use JTAG/ICE to debug a target board ? I know that there are
> commercial offerings (e.g raven,wiggler etc from Macraigor) but I want to
> use my own "JTAG hardware" (similar to altera byteblaster).
>
> At the moment I am using a small program by Simon Wood to control the target
> processor via JTAG. This implements a simple debugger (with the JTAG
> "protocol" in software, unlike the commercial offerings) and connects to the
> target via the abovementioned "byteblaster" type cable (on parallel port).
> However I wish to use the superior (no offence Mr Wood) capabilities of gdb
> (breakpoints, stepping etc.).
>
> My feeling is that I could use the base code that I have and somehow adapt
> it to present an interface that GDB needs (the fundamental question: what is
> this interface ????).

I suppose that the right mailing list is gdb@sources.redhat.com

You have to write so called target. Target primitives allow to
start/stop/step targer, read/write memory and registers and it is
basically it. There are quite a few targets already implemented, so
you have a lot of sample code there.

>
> I have had a decent (I think) look around mailing list archives and the web,
> but it appears that there is not much on this topic.
>
> My target is an ARM920T processor.
>
> Thanks
> Simon Berry
>
>
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If you have any questions still post it on gdb mailing list or write to
me directly.

Thanks,

Aleksey



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