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openOCD

openOCD including OpenRISC support with Mohor debug interface and Nathan Yawn adv_dbg_if debug interface.

A JTAG driver acting as a client for a VPI JTAG server interface is also included.

+---------------     +----------------+      +----------------+      +------------------+      +----------+ 
+              +     +                +      +                +      +                  +      +          + 
+ OpenOCD core + --> + JAG VIP driver + <==> + JAG VIP server + <--> + JTAG VPI verilog + <--> + JTAG TAP + 
+              +     +                +      +                +      +                  +      +          + 
+---------------     +----------------+      +----------------+      +------------------+      +----------+
                         jtag_vpi.c              jtag_vpi.c               jtag_vpi.v             any tap...
--------------------------------------- TCP  ------------------  VPI --------------------------------------
---------------------------------------      --------------------------------------------------------------
              OpenOCD                                                VPI + Verilog RTL

If you want to use the VPI JTAG driver, you need to configure OpenOCD like this:

./configure --enable-jtag_vpi --enable-adv_debug_sys --enable-maintainer-mode

Then you can start OpenOCD:

./src/openocd -f jtag_vpi.tcl

The JTAG VPI server (on the simulation side) has to be started before OpenOCD.