UBoot recovery for imx6 via JTAG

Technically all JTAG-adapter listed by OpenOCD should work, but DH electronics recommends the Olimex Arm-USB-OCD-Tiny-H. All tests and Documents were made in use of this one.

Installation

This installation was made on the Virtual Machine for Application Development. All console expressions refer to this Debian system.

1. OpenOCD
   • OpenOCD is a Linux package and is as easy to install as $ sudo apt-get install openocd
2. Drivers
   • If you use the JTAG-Adapter recommended by DH, then you need to install the FTDI-Drivers as followed:
     • Go to http://www.ftdichip.com/Drivers/D2XX.htm and Download your suitable Driver (32-bit or 64-bit)
     • Navigate into the Download folder $ cd /home/devel/Downloads
     • Untar the Downloaded zip-file $ tar xfvz libftd2xx-x86_64-1.4.6.tgz
     • For the next steps you need Admin rights (standard password for the VM is devel): $ sudo –su
     • You need to copy the folder $ cp libftd2xx.* /usr/local/lib
     • Changing the permission $ chmod 0755 /usr/local/lib/libftd2xx.so.1.4.6
     • Creating a link $ ln –sf /usr/local/lib/libftd2xx.so.1.4.6 /usr/local/lib/libftd2xx.so
     • Finish the installation $ exit

uBoot Programing

There are two ways for doing this. The easy way is an automatic Bash-script, which handles all the commands needed for the programing process. In this case you need a specified folder-structure so that the automatic script can find all its needed files. The other one is to type in the required commands. In a few cases this fails then you need to go the other way and program the uBoot manually.

1. Download the needed files here:
2. Automatic Script
   • The needed folder structure looks like this:
     • DHcom_uBoot_Programmer
       • bin_File (here are the uBoot files)
       • uBoot_Programmer (here are the Programing scripts)
     • Paste the "dhcom_olimex_arm_usb_tiny_h.cfg"-file in the OpenOCD folder at $ /usr/share/openocd/scripts/board
     • The "uBoot_Programmer_Olimex_arm_usb_tiny_h"-file needs to be in the uBoot_Programmer folder
     • The two u-boot files ("u-boot-spl-prog" and "u-boot-with-spl") belong to the bin_File folder
   • Open a terminal and navigate into the folder e.g. $ cd DHcom_uBoot_Programmer/uBoot_Programmer
   • Start the programing script: $ ./uBoot_Programmer_Olimex_arm_usb_tiny_h
3. Manual Programing
   • You need two terminals, one for GDB the other for OpenOCD an da Com-Port to get the serial output
   1. OpenOCD
      • openocd –f board/dhcom_olimex_arm_usb_tiny_h.cfg
   2. GDB
      • gdb --quiet
      • target remote localhost:3333
      • mon load_image /path/to/the/u-boot-spl-prog/file 0x908000
      • mon reg pc 0x908000
      • mon resume
      • Wait until the message "Searching for IVT header at DDR address 0x18000000" is on the serial output
      • mon halt
      • mon load_image /path/to/the/u-boot-with-spl/file 0x18000000
      • mon resume