JTAG USB User's Guide

The ​Gateworks GW16099 JTAG Adapter is used for flashing firmware to Gateworks Boards as well as serial console access.

This device is used to access Gateworks devices for debugging and developing purposes.

Gateworks provides a software utility application supporting x86 Linux. While JTAG programming is not supported for Windows operating systems you can use the JTAG dongle as a serial console.

References:

• ​GW16099/GW11033 on Gateworks on-line store
• ​Gateworks JTAG Utilities

JTAG Executables

The latest Gateworks JTAG Utilities are found ​here

Physical Connections

The header can be identified by looking at the connectors finding word JTAG silkscreened nearby on the PCB.

For Ventana / Newport / Venice:

​GW11033 JTAG Kit, which includes the GW16099

Instructions

Videos:

• ​jtag_usbv4, flashing .bin file, flashing GSC firmware, using mkimage_jtag to create .bin
• ​Getting started with Screen and flashing with TFTP

The Gateworks jtag_usb utility supports x86 32bit and 64bit Linux systems. Ubuntu is recommended, however most x86 Linux distros should work.

Virtual Machines should not be used due to potential timing issues which will cause the flash to fail.

The most recent version jtag_usbv4 supports all Gateworks product families and can be downloaded ​here

The Gateworks JTAG dongle uses a FTDI FT2232C Dual USB-UART/FIFO chip and when enumerated on the USB bus will show as:

lsusb | grep 0403:6010
Bus 001 Device 007: ID 0403:6010 Future Technology Devices International, Ltd FT2232C Dual USB-UART/FIFO IC

When connected the module ftdi-sio will expose two USB serial devices, this can be verified using dmesg -w or tail -f /var/log/syslog when the programmer is connected to the workstation.

ls -l /dev/ttyUSB*
crw-rw---- 1 root dialout 188, 0 Apr  2 07:04 /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 1 Apr  2 07:04 /dev/ttyUSB1

The first serial device (/dev/ttyUSB0) is used for JTAG, the second device (/dev/ttyUSB1) is for the serial console UART. You must remove the ftdi_sio module in order to use the ​jtag_usbv4 application.

The jtag_usb works by loading a small application onto the target processor which runs out of the SDRAM. Therefore you may need to update to the latest version in order to have support for new boards or memory configurations.

• Latest Linux x86 jtag_usb download: ​http://dev.gateworks.com/jtag/

Conflict with ftdi-sio driver

The jtag_usb application requires that the Linux ftdi_sio kernel module not be loaded to run. You can temporarily unload it, then reload it (ie by hotplugging the jtag dongle) when done if you require it.

To remove the module (prior to programming):

sudo rmmod ftdi_sio

You can determine if the ftdi_sio module is loaded using lsmod:

lsmod | grep ftdi
ftdi_sio               39858  1 
usbserial              42355  3 ftdi_sio

• Here the ftdi_sio IS loaded, it must be removed to program.

If you want to re-load the ftdi_sio module you can unplug and reconnect the Gateworks JTAG-USB Programmer on the USB bus (which triggers a hotplug event and reloads the module), or manually load it with sudo modprobe ftdi_sio.

Linux permissions on USB device

Serial devices are part of the 'dialout' group therefore require root permissions. The following errors can be resolved by issuing the jtag_usbv4 command as 'root'.

$ jtag_usbv4
libusb couldn't open USB device /dev/bus/usb/001/005: Permission denied.
libusb requires write access to USB device nodes.
libusb couldn't open USB device /dev/bus/usb/001/005: Permission denied.
libusb requires write access to USB device nodes.
$ ls -l /dev/bus/usb/001/005
crw-rw-r-- 1 root root 189, 4 Apr  2 06:54 /dev/bus/usb/001/005

Optionally, to create rule to change the device permissions every time it's enumerated on the bus can be done by adding a udev rule which identifies the VendorID and ProductID of the Gateworks JTAG-USB Programmer and executes a chmod on it:

cat << EOF > 51-gateworks-jtag-ftdi.rules 
# GW16060 Dongle 
SUBSYSTEM=="usb",ATTR{idVendor}=="0403",ATTR{idProduct}=="6010",MODE="0666",GROUP="users" 
# GW16061 Gang adapter
SUBSYSTEM=="usb",ATTR{idVendor}=="0403",ATTR{idProduct}=="6011",MODE="0666",GROUP="users"
EOF
sudo mv 51-gateworks-jtag-ftdi.rules /etc/udev/rules.d
sudo chmod 655 /etc/udev/rules.d/51-gateworks-jtag-ftdi.rules
# cause rules to be re-read and processed (or reboot)
sudo udevadm control --reload-rules
sudo service udev restart
sudo udevadm trigger

Using jtag_usb to read/write Firmware, Program Software

Please see above for the download link to the latest jtag_usb executable. Note that an update may be required for new board models or memory configurations.

1. Connect the JTAG-USB Programmer to the JTAG header on a Gateworks Single Board Computer using the attached ribbon cable.

2. Connect the JTAG-USB Programmer to a PC USB port using the supplied USB cable.

3. Verify FTDI module is not loaded.

4. Apply power to the Gateworks board.

5. Run the JTAG program (jtag_usbv4) with the syntax shown below to program a .bin file to the boards flash:

   ./jtag_usbv4 –p <filename> 
   

   • Optionally you can append 2>/dev/null to redirect error
   • Only flash .bin files using the jtag software. (or a .txt file for programming)
   • The switches –u <filename> –v <filename> are also available but are unnecessary to use when programming flash.
   • If you encounter any errors see the Troubleshooting section below.

jtag_usbv4 options:

Option	Operation	Notes
-p	Program Flash device using specified filename
-v	Verify Flash device using specified filename
-u	Upload Flash device using specified filename	Ventana & Newport not supported
-m	Program GSC Firmware using specified filename
-x	Verify GSC Firmware using specified filename

Examples

programming a firmware image:

./jtag_usbv4 -p laguna_nor_1408.bin


Gateworks JTAG Programmer v4.0 r327
Copyright (C) 2004-2014, Gateworks Corporation, All Rights Reserved
Built 08:28:20, Oct 29 2014
Using USB Port

Channel #      S01                                                             
--------------------------------------------------------------------------------
USB Open Rev    r0                                                             
JTAG_ID #00    CNS                                                             
JTAG_ID #01    CNS                                                             
JTAG_ID #02    MSP                                                             
Core 0 DRAM     OK                                                             
Load Debugger   OK                                                             
Flash Size      16                                                             
Flash Erase     OK                                                             
Flash Prog      OK     

Troubleshooting

• Permission denied: libusb couldn't open USB device - see above regarding Linux permissions
• fOP: USB Open Rev fOP - failure to open the USB device via libusb - you likely have the ftdi_sio serial driver loaded - see above
• FAL: JTAG_ID_#00 FAL - failure to identify a supported JTAG TAP on the target device - likely you have not powered the target board
• If while programming a board it gets stuck an invalid image may have locked up the board or the board is not powered on. Please try powering on the board.
• Flashing a invalid image. There are times when downloading files that the html version was downloaded rather than the file itself. Check the file extension and file size to be sure you have the correct file.
• While programming, if it gets stuck at "Load Debugger: fS3' or fS2, this may mean there are issues with the GSC. Please re-flash the GSC firmware as demonstrated here: http://trac.gateworks.com/wiki/gsc#GSCUpdates
• Be sure to always use the latest version of jtag_usbv4, failure to do so can result in the inability to flash.

Creating jtagable binary images with mkimage_jtag

• ​jtag_usbv4, flashing .bin file, flashing GSC firmware, using mkimage_jtag to create .bin

In order to create a jtagable image for Newport and Ventana products, you need to use the mkimage_jtag script to create a binary file containing flash instructions and content used by the jtag_usbv4 application. You can download the latest version of the script ​here:

wget http://dev.gateworks.com/jtag/mkimage_jtag
chmod +x mkimage_jtag

The usage varies, depending on what you want to program, how, and where. For example, you can create images that only update the boot firmware without touching the rest of flash. In general you provide binary files and details on where to place them and what to erase.

Notes:

• for eMMC you can specify the '--partconf <boot0|boot1|user>' option to instruct jtag_usbv4 to set the eMMC register that specifies the hardware to boot from
• the -s option invokes the 'scripted' mode which allows you to specify multiple objects
• the -e option invokes the 'scripted' mode but also instructs jtag_usbv4 to erase the entire part
• Because JTAG is extremely slow for large flash parts such as eMMC it is advised that you use JTAG just to flash the boot firmware then use the boot firmware to flash the remainder of the device

Examples:

• Newport eMMC:
  • update the boot firmware and set the hardware partition and erase the entire part:

    ./mkimage_jtag --emmc -e --partconf=user firmware-newport.img@user:erase_all:0-16M > firmware-newport.bin
    

• Ventana NAND: (see wiki:ventana/bootloader#nand here for NAND flash map)
  • update just the boot firmware (SPL and u-boot) - Does not erase anything else:

    ./mkimage_jtag SPL u-boot.img > uboot.bin
    

  • update just the rootfs (does not touch boot firmware):

    ./mkimage_jtag openwrt-ventana-rootfs.ubi > image.bin
    

  • update the boot firmware and the root filesystem (erases entire flash):

    ./mkimage_jtag SPL u-boot.img openwrt-ventana-rootfs.ubi > image.bin
    

• Program U-boot SPL, env, and erase entire part

  mkimage_jtag -e SPL@0 u-boot.img@14M env@16M > image.bin
  

• Program U-boot SPL and erase entire part

  mkimage_jtag -e SPL@0 u-boot.img@14M > image.bin
  

Once these steps are complete and the bin file has been generated, follow the other instructions on this page to flash this .bin file to the board. Linux instructions for programming are here #linux-jtag-flashing

Troubleshooting:

• If downloaded from a browser, make sure the mkimage_jtag script does not have any file extensions such as txt and be sure is has executable permissions.

Serial Console Access on Linux

​Establishing a serial console in Linux instructional video

The JTAG connector on all Gateworks Families includes a serial port.

You may use the device with your favorite linux terminal program (Screen, etc...) at 115,200 baud, 8 data bits, 1 stop bit, no parity and no flow control

Gateworks suggests using the program screen to access the serial console.

Example: open /dev/ttyUSB1 (Note that the device may vary on your system if you had /dev/ttyUSB devices prior to plugging the JTAG adapter into your USB bus)

screen /dev/ttyUSB1 115200,cs8

• You may need to use the sudo command in front of the screen command
• Typically /dev/tty* nodes are owned by root.dialout which means you need to be root or a member of the dialout group. If this is the case you will get a permissions error and you can either run the command with a 'sudo' in front of it, or add your user to the dialout group

Troubleshooting:

• you will likely need to add your user to the dialog group by editing the /etc/group file:

  ls -l /dev/ttyUSB*
  

• make sure modem-manager is not installed as this will perform serial operations on new tty devices when they appear on the system and likely cause issues with using screen on the same port:

  sudo apt-get remove --purge modem-manager
  

Windows

Programming

Gateworks does not offer JTAG programming software for Windows If you're limited to using a system which has Windows naively installed consider creating a 'live boot' (with persistance) USB with Ubuntu.

• ​https://ubuntu.com/tutorials/create-a-usb-stick-on-windows#1-overview

Windows Operating Instructions For Serial

You can use a terminal program for windows such as ​Putty / Hyperterminal to connect to the Gateworks board serially over the JTAG / or serial port as long as the FTDI Virtual COM port drivers are installed on your system:

• ​https://www.ftdichip.com/Drivers/VCP.htm - Downloads for x86 (32bit) and x64 (64bit) Windows drivers

To see if you have the proper drivers installed simply connect the Gateworks JTAG dongle to your Windows PC and look in the 'Device Manager' application under 'COM Ports' to see if a new serial device was added.

Configure the terminal program for 115,200 baud, 8 data bits, 1 stop bit, no parity and no flow control.

Power the board, and wait for text to output. Hitting the 'Enter' key may also bring up a prompt.

Please see these excellent howto's for various terminal program on Windows:

• ​Setup Serial Console Connection using PuTTy
• ​Configuring Serial Terminal Emulation Programs (Hyperterm, PuTTy, and Terra Term Pro)

General Troubleshooting

1. Do not use a Virtual Machine
2. If while programming a board it gets stuck an invalid image may have locked up the board or the board is not powered on. Please try powering on the board.
3. Flashing a invalid image. There are times when downloading files that the html version was downloaded rather than the file itself. Check the file extension and file size to be sure you have the correct file.
4. While programming, if it gets stuck at "Load Debugger: fS3' or fS2, this may mean there are issues with the GSC. Please re-flash the GSC firmware as demonstrated here: http://trac.gateworks.com/wiki/gsc#GSCUpdates
5. Ground loops can occur between the board power supply and the JTAG cable. Be aware of this and isolate properly.
6. GW16042 with 10 > 14 pin adapter board will flail to flash Newport boards. Serial console is verified to work.

If still have difficulties, please contact Gateworks support at support@gateworks.com

JTAG Programmer Hardware

Please see out JTAG hardware page here: JTAG Hardware PAGE