topic Re: Debug Port Fail in MPC5xxx

Debug Port Fail

jlim — Tue, 14 Mar 2017 14:17:18 GMT

Hi, is it possible to lock out debugger access after programming the DCF record in the UTEST memory region?

I am using the MPC5744P micro and the Lauterbach debugger. After programming a DCF record incorrectly, I am getting just a "debug port fail' error without any additional error information when entering these commands: ‘SYStem.DETECT CPU’ or ‘SYStem.Up’.

How do I go about unlocking the device?

Thanks

Re: Debug Port Fail

petervlna — Wed, 15 Mar 2017 12:46:42 GMT

Hi,

You have to be careful when programing DCF records and UTEST flash.

Incorrect programming or erase lead to brick micro.

And this is your case.

Only way is to replace microcontroller as it is now censored with unknown JTAG password.

Peter

Re: Debug Port Fail

bingwang312 — Sun, 05 Dec 2021 06:46:43 GMT

is there a reset button or pin on the chip, so we can press the button and hold it over certain time to reset and erease while flash memory in the chip?