MPC5xxxのトピックRe: MPC574XG CPU is locked

MPC574XG CPU is locked

sijiahao — Thu, 02 Jun 2016 07:42:54 GMT

I have a problem with MPC574XG(Calypso), the CPU is locked! “debug port fail” due to censorship.

The debugger is Trace32 from Lauterbach, this is the error informantion:

according to the debugger_mpc5500.pdf on Trace32, we think the CPU might be locked.

We also tried to enter the keycode to unlock it, but failed.

Can you help me to fix this? or any suggestions?

Best Regards

Sijia

Re: MPC574XG CPU is locked

davidtosenovjan — Thu, 02 Jun 2016 07:56:22 GMT

I would try to decrease debugger frequency to 1MHz

Although I don't know the reason it helps to me as I have the same problem with certain devices.

Re: MPC574XG CPU is locked

petervlna — Thu, 02 Jun 2016 08:40:09 GMT

Did you play with UTEST memory area where censorship is stored?

Re: MPC574XG CPU is locked

sijiahao — Thu, 02 Jun 2016 08:55:01 GMT

I think yes. the board was downloaded with a wrong elf by someone else, which may edit this UTEST part.

Re: MPC574XG CPU is locked

petervlna — Thu, 02 Jun 2016 10:40:22 GMT

If this is the case, then there is way to recover from this state.

You have to replace microcontroller.

Re: MPC574XG CPU is locked

jlim — Tue, 14 Mar 2017 18:06:10 GMT

I am having a similar problem after incorrectly modifying part of the UTEST region. Although, mine does not show any additional information other than "debug port fail". Can I still recover the device?