topic Re: JTAG lock in MPC5744P in MPC5xxx

JTAG lock in MPC5744P

tom_cruise_234 — Tue, 21 Jun 2022 14:10:27 GMT

how to lock the JTAG in MPC5744p, what are the methods avaliable to Lock the JTAG ?

Is there any register avaliable to Lock the JTAG?

Re: JTAG lock in MPC5744P

tom_cruise_234 — Thu, 23 Jun 2022 09:01:52 GMT

If anybody support on this topic will be very helpful

Re: JTAG lock in MPC5744P

tom_cruise_234 — Fri, 24 Jun 2022 05:12:46 GMT

where can i find security documentation?

how to enable JTAG_password instruction?

Re: JTAG lock in MPC5744P

davidtosenovjan — Fri, 24 Jun 2022 11:53:05 GMT

I am afraid no security documentation exist for the device. It is apparently relic form other manual. I have reported this to application team as a typo.

Pay attention to MPC5744PRM, Rev. 6.1, 10/2017, Page 208, 2.32.1 Unsecuring the microcontroller:

https://www.nxp.com/webapp/Download?colCode=MPC5744PRM

For JTAG_PASSWORD register description see

61.3.5 JTAG_PASSWORD register

In general I would point out following appnote:

https://www.nxp.com/docs/en/application-note/AN4365.pdf

Also following examples could be useful:

https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/Example-JTAG-access-Addendum-to-application-notes-AN3283-and/ta-p/1115777

If your question in related to specific debugger use, I would recommend to consult with debugger’s provider or support.

Re: JTAG lock in MPC5744P

davidtosenovjan — Fri, 24 Jun 2022 11:54:11 GMT

Here you may find procedure how to perform censorship with Lauterbach debugger:

https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/MPC5744P-Censorship-programing-with-Lauterbach/ta-p/1113543

Re: JTAG lock in MPC5744P

tom_cruise_234 — Sat, 25 Jun 2022 11:46:01 GMT

I am using UDE 4.6 debugger.

Any script from UDE will be more helpful

Re: JTAG lock in MPC5744P

davidtosenovjan — Mon, 27 Jun 2022 09:30:42 GMT

Unfortunately we don't have any experience with this debugger. I would recommend to contact PLS support:

https://www.pls-mc.com/contact/

Re: JTAG lock in MPC5744P

tom_cruise_234 — Mon, 27 Jun 2022 14:24:49 GMT

Thank you .I have flashed the DCF records in UTEST flash memory instead of script.

After flashing this hex file the DCF records are set and password is 0x1234567812345678,

when i reseted and tried to access the JTAG its not working, any other special procedure to unlock apart from above password. ?

Re: JTAG lock in MPC5744P

davidtosenovjan — Tue, 28 Jun 2022 07:06:53 GMT

The debugger should be capable to enter the password similar way as procedure below:

"JTAG PASSWORD must be inserted in order to work with JTAG.

Lauterbach -> sys.option.keycode 0x1234567812345678

sys.attach

sys.break

The device is now accessible trough JTAG."

Please consult with your debugger's provider documentation or their support.

Re: JTAG lock in MPC5744P

tom_cruise_234 — Thu, 30 Jun 2022 04:44:01 GMT

As per my understanding modification of DCF records in UTEST flash memory is not possible.

is it atleast possible to read the memory location ?

can it be possible to access the DCF records using pointer?

Re: JTAG lock in MPC5744P

davidtosenovjan — Tue, 05 Jul 2022 11:10:51 GMT

Modification is not possible, but you may write new record after last record, if the ID is the same, last entry is valid one (of course you must be able to access the device).