TMS320F280025: Regarding securing flash using DCSM module.

Jeevan Sagar

Prodigy 10 points

Part Number: TMS320F280025
Other Parts Discussed in Thread: UNIFLASH

Hi,

I'm using zone 2 for securing only sector 9 of the flash memory, i programmed the csm password as well

Z2CSM PSWD0: FFFF FFFF

Z2CSM PSWD1: E3FF FFFE

Z2CSM PSWD2: FFFF FFFF

Z2CSM PSWD3: FFFF FFFF

I'm currently not using zone 1, the default csm password are present for zone 1.

here are my doubts:-

1) even though my code starts from sector 0 - sector 6, i'm not able to load the image through uniflash without the correct csm passwords.

Do i need to match the csm password even if the code is to flashed to unsecure memory regions?

( I referred to this discussion TMS320F28379D: using UniFlash to configure DCSM for the first time and had put the controller in wait boot mode using the pins on launch pad )

2) i'm not able to read the code (verify image / read memory) even after matching the csm passwords.

3) I tried in CCS, i'm able read/ Flash the code with the correct csm passwords entered in the flash settings in the project properties.

If i see the B0_SECTSTAT Register, i can see that all other sectors from 0 to 6 are unsecured.

But when i try to enter the wrong csm pswd in Z2_CSMKEY1, along with the sector 8 all other sectors are getting read protected.

The sector 0 start address is 0x81000

Img1: With csm pswd match Img2: With wrong csmKey1

Can someone kindly clear my doubts regarding this?

thanks,

jeevan

11 months ago

+1 Vivek Singh 11 months ago

TI__Guru** 113875 points

Hi,

Jeevan Sagar said:
1) even though my code starts from sector 0 - sector 6, i'm not able to load the image through uniflash without the correct csm passwords.

What are the settings for the GRABSECT bits for the flash ? If you have not made them unsecure then yes, you need to unlock Zone2 to do and flash operations on any of the sectors.

Jeevan Sagar said:
2) i'm not able to read the code (verify image / read memory) even after matching the csm passwords.

That should not be the case. Please check the zone lock status to make sure passwords are correct and zone is unlocked.

Jeevan Sagar said:
If i see the B0_SECTSTAT Register, i can see that all other sectors from 0 to 6 are unsecured.

Default 11 is not unsecure. Please see this table in TRM.

Regards,

Vivek Singh

0 Jeevan Sagar 11 months ago in reply to Vivek Singh

Prodigy 10 points

Hi vivek, thanks for the reply

I'm facing another issue in uniflash.

I wanted to update the link pointers for Zone1

I changed it from 1FFF FFF to 1FFF FFFE (all 3 link pointers) and then i updated the password according to the new ZSB and tried to unlock. But it throwed an error like this.

And then i clicked the button and i observed that the link pointer values are updated as zeroes.

The final ZSB (ZSB 29) has been selected now. I am not getting how this has happened.

Kindly help me understand what is that i am missing.

0 Vivek Singh 11 months ago in reply to Jeevan Sagar

TI__Guru** 113875 points

Can you unlock the device using the password from selected link pointer and then check the value of link pointer in OTP location.

0 Jeevan Sagar 11 months ago in reply to Vivek Singh

Prodigy 10 points

No, I tried unlocking using the default password corresponding to the Linkpointer 1FFF FFFE (ZSB1), it did not work. So i checked the linkpointer values and it was 0000 0000 and now i was able to unlock using the final default password(ZSB29).