TMS320F280025C: Failed unlocking device after reset

Hi Yogini,

Looks like you programmed the passwords in to the DCSM OTP.

You can enter the passwords in the flash plugin GUI and unlock the device before doing the flash erase/program operations.

Thanks and regards,
Vamsi

Hello Vamsi,

I did not touch the DCSM OTP. 

I was just modifying the flash example code, and trying to test erase and write for flash.

How to know, that DCSM is getting accessed via code?

also , I do not know the password, do you have any other way to come out of this issue?

Hello Vamsi,

Please help us to restart the board.

Hi Yogini,

I will remind our security expert to help you.

Thanks and regards,

Vamsi

Hi Yogini,

I checked now and our security expert is not available this week.  I will guide you further.

Please check the table Figure 3-15. Location of Zone-Select Block Based on Link-Pointer for Bank0 in the TRM and you would notice the ZxOTP_CSMPSWD0, ZxOTP_CSMPSWD1, ZxOTP_CSMPSWD2, ZxOTP_CSMPSWD3. 

Please check those locations in the debugger memory window.  You can copy those values in to the CCS flash plugin GUI's password locations and click on unlock.

Thanks and regards,
Vamsi

thanks vamsi. We will check once and let you know

Ok Yogini.  I will keep this thread in pause until you come back.

Thanks and regards,
Vamsi

Hello Vamsi, 

I verified the passwords at their memory locations , nothing is overwritten there. Also , i entered the same in GUI for unlocking, but I still see the error.

Hi Yogini,

As discussed offline, the device is permanently locked due to all 0s password.

You might have programmed all 0s by mistake either by GUI or from the application image - please check your application's map file to see what is mapped to those locations.

I will assign this to our security expert to help you further since I will out of office for this week.

Thanks and regards,
Vamsi

hi Vamsi,

ohh, is there anything that we should take care to avoid writing these registers which locks the boards permanently?

Yogini,

Vamsi is out of office until Tuesday. Please expect response by Tuesday.

Thanks & Regards,

Santosh

Thanks Vamsi