More information on the JTAG interface is available for the interested. The end result is a Cortex M4F board that can work with standard tools at a third of the price of the Kinetis’ development board. confirms that the debugging functionality will be added to the bootloader code soon but until then, a hardware hack is a working, if brutal, approach to debugging on the platform. After the KL02Z was removed, populated the debug headers and then wired up the Segger J-Link to the board and tested it out with Eclipse, GDB, and standard SWD debug tools. Impatient, documents the changes he made to add support for the J-Link SWD protocol by removing the offending NXP Kinetis KL02Z that serves as the as the onboard interface and bootloader that helps the Arduino IDE talk to the K64F which is the main chip. Like many dev boards, it uses a less powerful processor as an interface. Teensy designer added a debug header to allow direct SWD JTAG access to the main chip, but the interface microcontroller has to be silenced for that to work, and the code to do so is still in progress. The Teensy is a powerful ARM-based development board with loads of features that can do fun stuff with USB as well.
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