AnsweredAssumed Answered

How to unlock a secured Freescale Kinetis L chip

Question asked by rogerzhong on Nov 1, 2012
Latest reply on Aug 26, 2016 by quan huynh

Hi,

 

I am working on an FRDM-KL25Z board. But the MKL25Z128xx chip was secured accidentally, it seems that the on-board OpenSDA can not unlock this MKL25Z128xx chip, so I try to using "unlock kinetis" command in Jlink commander, but it also can not be unlocked successfully, and Jlink commander displays the following message.

 


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SEGGER J-Link Commander V4.56 ('?' for help)
Compiled Oct 22 2012 19:40:24
DLL version V4.56, compiled Oct 22 2012 19:40:04
Firmware: J-Link ARM V8 compiled Sep 20 2012 13:27:01
Hardware: V8.00
S/N:
Feature(s):
VTarget = 3.002V
Info: Found SWD-DP with ID 0x0BC11477

 


****** Error: Could not read AHB-AP Id. Could not connect to target.
Info: Found SWD-DP with ID 0x0BC11477
No devices found on JTAG chain. Trying to find device on SWD.
Info: Found SWD-DP with ID 0x0BC11477

 


****** Error: Could not read AHB-AP Id. Could not connect to target.
Info: Found SWD-DP with ID 0x0BC11477
No device found on SWD.
Failed to identify target. Trying again with slow (4 kHz) speed.
Info: TotalIRLen = ?, IRPrint = 0x..000000000000000000000000
Info: TotalIRLen = ?, IRPrint = 0x..000000000000000000000000
No devices found on JTAG chain. Trying to find device on SWD.
Info: Found SWD-DP with ID 0x0BC11477

 


****** Error: Could not read AHB-AP Id. Could not connect to target.
Info: Found SWD-DP with ID 0x0BC11477
No device found on SWD.
J-Link>unlock kinetis
Unlocking device...Timeout while unlocking device.
J-Link>
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How to unlock a secured Kinetis L MCU with a JLink? Does OpenSDA or Jlink support such feature of unlocking secured Kinetis L MCU?

 


Thanks!

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