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JTAG PROGRAMMING UTILITY README FOR OPENRISC 1000

INTRODUCTION

JP1 is a proprietary JTAG protocol. It is very simple, and perhaps
its biggest advantage is that no special HW is needed -- only a
parallel port cable and some buffers. It is compatible with Xilinx
Parallel Cable III.

Gdb is capable of connecting, controlling and debugging the board
via JP1. Currently jp1 has a support only for Linux.



USAGE

First, start the jp1 program in root mode, e.g.:

./jp1 9999

The parameter specified designates TCP/IP port address,
where the server starts. Then start gdb and connect to it,
using e.g.:

$ or32-rtems-gdb test.or32
(gdb) target jtag jtag://localhost:9999

Then load the program into the memory:

(gdb) load

and start it up:

(gdb) set $pc=0x100

You can write stepi or si, to see if things are working
correctly:

(gdb) stepi

If the program counter increases, we can set the breakpoint
and run the program with command 'continue' or 'c'.



AUTHORS

Simons Srot, simons@opencores.org
Marko Mlinar, markom@opencores.org