MPC5xxxのトピックRe: MPC5604B software reset

MPC5604B software reset

283230333 — Wed, 20 Apr 2016 06:14:29 GMT

In MPC5644A , we can reset the software by the bit "SIU.SRCR.B.SSR" . Now we want to reset the MPC5604B in the same way , so how can I do it ?

Re: MPC5604B software reset

davidtosenovjan — Wed, 20 Apr 2016 06:47:19 GMT

Use the MC_ME module to enter the RESET mode (SW functional reset):

/* software reset */

ME.MCTL.R = 0x00005AF0;

ME.MCTL.R = 0x0000A50F;

This sequence reset the device.

Re: MPC5604B software reset

283230333 — Thu, 21 Apr 2016 01:31:30 GMT

Ok , very thanks! Another question ! The problem is still about 5604B. I have erased the shadow block of the 5604b , but didn't write a new correct data. So I can't access the device via the JTAG. But recently, I have also erased the shadow block of the 5644A , and also didn't write a new correct data. But i can still access the device via the JTAG by configure the BOOTCFG pin, and let the code run in the RAM. So, can I uncensorship the 5604B by the same way?

Re: MPC5604B software reset

davidtosenovjan — Thu, 21 Apr 2016 07:20:26 GMT

Censorship is very sensitive thing. It is needed to use it very carefully, because an inappropriate usage can lead in making the device useless. If you accidentally erase shadow flash there is no chance to recover it (unless it had been though about before).

If your device is censored and you don’t have any pre-prepared recovery code located in the internal flash memory, there is no way how to unlock it and everything you can do is to order new sample, and re-solder it instead of the censored one.

Thus I would recommend to study following appnote:

http://cache.freescale.com/files/32bit/doc/app_note/AN3787.pdf

Re: MPC5604B software reset

alexvinchev — Thu, 21 Apr 2016 07:34:18 GMT

Hi David,

is there document, similar to this one, but for MPC57xx family? I'm interested especially for MPC5748G.

Re: MPC5604B software reset

283230333 — Thu, 21 Apr 2016 08:13:08 GMT

Thanks for your reply. Are there another way can encrypted the device, and can't access the device via the JTAG?

Re: MPC5604B software reset

davidtosenovjan — Thu, 21 Apr 2016 11:11:48 GMT

It works slightly different way on MPC5644A (and all MPC55xx) and MPC5604B (and most of 56xx).

Erased shadow flash means in case MPC5644A that device is censored. In case you switch to serial boot mode, you can access to the device over JTAG, but internal flash does not work (it means internal RAM target works, internal FLASH target does not).

In case MPC5604B device, in case shadow flash is erased, device is locked out permanently and neither JTAG access is allowed. Thus the device is broken and there is no other way how to repair it.

Re: MPC5604B software reset

davidtosenovjan — Thu, 21 Apr 2016 11:26:54 GMT

I am not aware of any document dealing with MPC57xx censorship. Unfortunately I don’t have experience with that implementation. You may try to submit new thread or case, maybe someone will help you.