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TK71 Installation


Have a look at the board documenatation (PDF, 1.4MB). Attach the appropriate connectors, for a full fresh install we will need UART (RS232), JTAG and of course power. Please pay attention to the power supply voltage and polarity!

You will also need a properly setup DHCP and TFTP server. The DHCP server should supply the IP address of the TFTP server as "next server" parameter. Copy the following files from a release directory to the root-directory of your tftp server and rename them during that step, e.g.:


For JTAG usage install OpenOCD V0.3.1 or later to your system. The release diretory contains a configuration for OpenOCD and TK71. To use OpenOCD first connect all connectors, copy the openocd configuration file "openocd-tk71.cfg" to the current directory, power-up the board and then run the OpenOCD server:

openocd -f ./openocd-tk71.cfg

UBoot via JTAG

In case your bootloader that came pre-installed on the TK71 board is broken you can reinstall it using JTAG. First startup the OpenOCD server as described above and then run the following commands:

# telnet localhost 4444
> tk71_init
> load_image [path-to-files/]u-boot
> resume 0x60000

At this point after a small moment you should see UBoot starting up on the serial console (UART 115200 baud, 8N1). Interrupt the UBoot auto-boot sequence by pressing any key.

At the UBoot prompt now enter the command:

TK71> run update_uboot

This command will try to get a DHCP lease from your DHCP server and then download the file "/u-boot.kwb" from your TFTP-server, erases the UBoot NAND flash partition and writes the downloaded file to that NAND partition, like this:

...UBoot progress...

Flashing Updates

UBoot is pre-setup with commands to update all relevant NAND flash partitions:

UBoot Environment

Some crucial system settings are stored in the UBoot environment. Sometimes it can be necessary to reset the environment.

Before zapping all settings plesae note the ethernet MAC address first:

TK71> printenv

There are two environment variables containing the MAC addresses:


We will reuse the contents of those variables as [mac-addr1] and [mac-addr2].
To erase the environment issue the following command in UBoot:

TK71> nand erase u-boot-env
TK71> reset

The second command will reset the board. Upon UBoot startup it will notice the erased environment and fall back to a builtin default environment. This will also reset the ethernet MAC addresses so those need to be reprogrammed:

TK71> setenv ethaddr [mac-addr1]
TK71> setenv eth1addr [mac-addr2]
TK71> saveenv
TK71> reset

Upon UBoot startup the MAC addresses are progrmmed into the SOC MAC address registers so UBoot needs to be reset after changing a MAC address.

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