Error trying to add a new board

[cmenendezzz]

Hi!

First of all, thank you very much for your work; it is very impressive.

I am trying to add a new board to the software, a Kintex7. Nevertheless, I am experiencing some difficulties. I created all the necessary folders and files. Concerning the fuzzer file, I reused the playground from the Basys3 because they share some specifications. I installed OpenOCD, and I even verified that it works correctly outside of the context of ConFuzz.

However, when I try to call the main_fuzzer.py with the --board and --fuzzer-name arguments, I am experiencing the errors shown in the image. It seems to be an error with the TCP connexion I think...

I would greatly appreciate it if you could help me. Thank you very much in advance.

[hycrypt]

Hi cmenendezzz,
thank you for using ConFuzz and trying to add new boards. :)

I think you are right, ConFuzz is not able to establish a TCP connection to the OpenOCD server after starting it.

Are you sure the default TCP port (6666) is accessible? Maybe make sure that there are no OpenOCD processes running from previous tests. You could also try specifying a different port in src/constants.py.

You could use the -d command line argument to start the fuzzer. This should print additional messages that could help. For example, the OpenOCD commands issued in the background. Try running them manually to verify they are running without errors.

It looks like you are using Windows, maybe you could try to use a Linux environment to make sure this is not an OS-specific error.

Kind regards,
Felix

[cmenendezzz]

Hi Felix!

Thank you very much for your fast response!
I tried changing the port but I still get the same error...
Also I tried the port 6666 in an independent cmd window with an openocd command and I obtain a good connexion!

Concerning the -d command, here is what I obtain :

Apparently it can't find my opencd configuration file. Neverthless I just verifiedthe name of my file and the name I put in the constants file and it is the same:

Thank you very much again!

[cmenendezzz]

I just fixed the openocd issue erasing the 't' from the folder xc7k70 in 'static' ... :)

Now I have this error:

With '-d':

[hycrypt]

Very good, this looks much better. :)

I guess your JTAG tap names are not aligned. Try setting the OPENOCD_TAP_NAME constant of your board to "xc7k70". Or modify your OpenOCD configuration to use a tap called xc7.tap.

[hycrypt]

Which board are you using? Can you post your openocd-xc7k70.cfg?

You need to make sure the tap names are correct and a tcl function to program the board can be called (xc7_program $tap; for 7-series and xcu_program $tap; for UltraScale). These functions are included in OpenOCD by default. However, ConFuzz calls them using the OPENOCD_TAP_NAME constant (f"{CONSTANTS.BOARD_CONSTANTS.OPENOCD_TAP_NAME}_program $tap"). Therefore, you either have to change the tap name accordingly or create an alias that calls the respective program function.

[cmenendezzz]

It worked! Thank you very much!

Here are the informations I used:

class XC7K70:
    """Device specific constants for the Kintex-7 board.

    https://www.xilinx.com/products/silicon-devices/fpga/kintex-7.html
    https://docs.xilinx.com/r/en-US/ug470_7Series_Config
    """

    OPENOCD_TAP_NAME = "xc7k70"
    OPENOCD_BASE_CFG = "openocd-xc7k70.cfg"

    XILINX_SERIES = "series_7"
    DEVICE_IDCODE = b"\x03\x64\x70\x93"  

    FRAME_LENGTH = 101    
    PIPELINING_WORDS = 0

    RESTART_DELAY = 0.002   #not sure

    RESTART_DELAY_CONFIGURATION = 0.054  #not sure

    FABRIC_SIZE = None
    ROW_END_POSITIONS = None

And the config. file:

# SPDX-License-Identifier: GPL-2.0-or-later

# xilinx kintex-7 xc7k70t
# http://www.xilinx.com/support/documentation/user_guides/ug470_7Series_Config.pdf


adapter driver ftdi
ftdi vid_pid 0x0403 0x6010
ftdi layout_init 0x0008 0x000b
adapter speed 2000
transport select jtag 

if { [info exists CHIPNAME] } {
    set _CHIPNAME $CHIPNAME
} else {
    set _CHIPNAME xc7k70
}

# the 4 top bits (28:31) are the die stepping/revisions. ignore it.
jtag newtap $_CHIPNAME tap -irlen 6 -ignore-version \
    -expected-id 0x03647093



set XC7_JSHUTDOWN 0x0d
set XC7_JPROGRAM 0x0b
set XC7_JSTART 0x0c
set XC7_BYPASS 0x3f

proc xc7_program {tap} {
    echo "DEPRECATED! use 'virtex2 program ...' not 'xc7_program'"
    global XC7_JSHUTDOWN XC7_JPROGRAM XC7_JSTART XC7_BYPASS
    irscan $tap $XC7_JSHUTDOWN
    irscan $tap $XC7_JPROGRAM
    runtest 60000
    #JSTART prevents this from working...
    #irscan $tap $XC7_JSTART
    runtest 2000
    irscan $tap $XC7_BYPASS
    runtest 2000
}

i added thoses lines :

adapter driver ftdi
ftdi vid_pid 0x0403 0x6010
ftdi layout_init 0x0008 0x000b
adapter speed 2000
transport select jtag

because i am using an ft2232 in order to communicate with the FPGA