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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 support only for Linux.



USAGE

jp1 [cable] [port] <cable options>

The cable parameter selects the cable to use for communicateing with the board.
At the time of writting, cable may be one of xpc3, xess, rtl_sim or vpi.  xpc3
assumes a xillinx parallel cable 3, rtl_sim connects to a rtl simulator,
communicateing with it via files (slow), vpi connects to a rtl simulator via the
vpi (faster).  The port parameter specified designates TCP/IP port address where
the server starts.  Run jp1 without arguments for a list of cable specific
options.

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

./jp1 xpc3 9999

 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