A method of disabling the protection CRP3 microcontroller LPC2478.
This method does not allow the reading of locked memory microcontroller.
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Thread: KESS2\K-TAG lpc2478 UNLOCK
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15th November, 2015, 04:47 AM #1Top Poster +
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KESS2\K-TAG lpc2478 UNLOCK
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15th November, 2015, 08:26 PM #2Top Poster +
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Details...
350?C
Last edited by EduardNN; 15th November, 2015 at 09:10 PM.
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15th November, 2015, 08:41 PM #3DK Veteran
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Good work friend.
Probably the success rate is not 100 %, but it is a good solution.
We thank you alll.
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15th November, 2015, 10:09 PM #4Top Poster +
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K-Tag pins. Photography is not mine
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15th November, 2015, 10:42 PM #5DK Veteran
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try ,but When I connect pin 148 mcu > 3.3v
led red not blinkLast edited by pinotec; 15th November, 2015 at 10:54 PM.
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16th November, 2015, 02:07 AM #6DK Veteran
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Good find,MCU is susceptible to power glitch.
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16th November, 2015, 10:36 AM #7DK Veteran
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Not that susceptible to power glitch i guess. Thinking how things work, i suspect the trick is that after certain ammount of heat the microprocessor cannot read properly the flash content upon initialization, if just one single bit of the CRP3 pattern gets changed/corrupted the bootloader not enter/obey CRP3 mode inmediately and allow bootmode to kick in. Guess after that, the only operation allowed without recheck for CRP3 pattern again is FULL ERASE, that's why you cannot read MCU content once it cooled and have access to flash again. This is all theory/educated guess, haven't tested myself over a real MCU.
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16th November, 2015, 12:57 PM #8DK Veteran
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j-link You can read, is to try but always the same failure
no read target memory
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16th November, 2015, 01:26 PM #9DK Veteran
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have you try with ktag?
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16th November, 2015, 02:35 PM #10DK Veteran
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I see it takes two tools,
flash magic + j link.
I have only jlink I can do it, or do I need another tool where I can buy, Greetings
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16th November, 2015, 05:13 PM #11Top Poster +
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Only rs232 (uart) + flash magic.
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17th November, 2015, 09:23 PM #12DK Veteran
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need connect 12v ?
my led red always off if not connect 12v
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18th November, 2015, 07:14 AM #13Top Poster +
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LED need to monitor the state of the processor and it must be switched by the controller. If you do not have the power on the controller when connected by USB, then connect the other power source.
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19th November, 2015, 05:38 PM #14Junior Member
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Good find, will check soon
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22nd November, 2015, 04:41 PM #15Junior Member
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Can i ask for help here, i lifted off one pad from my ktag, and i cant find now where it should connect it to make it work. I marked it with yellow, its one of the pads that should be connected with white wire. i tried to solder wire, but it was too thick, and i lifted the whole pad as marked ... i preheated it i think, and it felt with the wire ;( I need to know where is it going, so i can fix it ...
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