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boards: arm: Add troubleshooting section to frdm_k64f doc

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Adds a troubleshooting section to the frdm_k64f board document that
describes how to unlock the flash after normal west flash/debug commands
fail.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
This commit is contained in:
Maureen Helm 2020-07-29 17:11:10 -05:00 • committed by Carles Cufí
commit 26af5fc8d7
1 changed files with 23 additions and 0 deletions
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boards/arm/frdm_k64f/doc/index.rst
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@ -301,6 +301,29 @@ should see the following message in the terminal:
***** Booting Zephyr OS v1.14.0-rc1 *****
Hello World! frdm_k64f
Troubleshooting
===============
If pyocd raises an uncaught ``DAPAccessIntf.TransferFaultError()`` exception
when you try to flash or debug, it's possible that the K64F flash may have been
locked by a corrupt application. You can unlock it with the following sequence
of pyocd commands:
.. code-block:: console
$ pyocd cmd
0001915:WARNING:target_kinetis:Forcing halt on connect in order to gain control of device
Connected to K64F [Halted]: 0240000026334e450028400d5e0e000e4eb1000097969900
>>> unlock
0016178:WARNING:target_kinetis:K64F secure state: unlocked successfully
>>> reinit
0034584:WARNING:target_kinetis:Forcing halt on connect in order to gain control of device
>>> load build/zephyr/zephyr.bin
[====================] 100%
>>> reset
Resetting target
>>> quit
.. _FRDM-K64F Website:
https://www.nxp.com/support/developer-resources/evaluation-and-development-boards/freedom-development-boards/mcu-boards/freedom-development-platform-for-kinetis-k64-k63-and-k24-mcus:FRDM-K64F