gdb and jtag

[Doug Evans <dje at transmeta dot com>]

Simon Berry writes:
 > 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 ????).

Study the remote*.c files in the gdb sources and pick one to use as
boilerplate.  The canonical one is remote.c.

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