TMS320F28379D: DCSM - Unable to Program Flash when only Emulation Code Security Logic (ESL) locked.

Anil Singhal

Part Number: TMS320F28379D

I am unable to program the flash when ESL is locked by programming a password at Z1_CSMPSWD0 & Z1-CSMPSWD1. The remaining (CSMPSWD2 & CSMPSWD3) are left at 0xFFFFFFFF.

In section (2.13.1.6) of TRM (FLASH and OTP Erase/Program):

"Before programming any secure Flash sector, the user must either unlock the zone to which that particular sector belongs, using PMF or execute the Flash programming code from secure memory which belongs to the
same zone. The same is the case for erasing any secure Flash sector."

The way I interpret the above, there are two use cases:

1. Unlock the CSM by providing the correct password for Z1_CSMPSWD0 & Z1-CSMPSWD1

OR!!

2. if the secure memory is in the same zone, then NO need to unlock and programming of the flash is allowed as long as the flash routines are executing from the same zone.

I observe:

I cannot program the flash unless I unlock the CSM using the passwords for Z1_CSMPSWD0 & Z1-CSMPSWD1. My flash programming routines are executing from LSRAM.

Am I missing something?

over 6 years ago

0 Vivek Singh over 6 years ago

TI__Guru** 115271 points

Anil,

Is LSRAM, from where you are executing the flash programming routine, is also secure and part of Z1 ? If not then it'll not work.

Can you tell the steps yor are following to achieve this.

Regards,
Vivek Singh

0 Anil Singhal over 6 years ago in reply to Vivek Singh

Intellectual 810 points

Here is a memory dump starting from location 0x5F000
0 Z1_LINKPOINTER FE FF FF FF
2 Z1_OTPSECLOCK 0F 0F 00 00
4 Z1_BOOTCTRL FF FF FF FF
6 Z1_LINKPOINTERERR 00 00 00 00
8, A, C, E 00 00 00 00 , 00 00 00 00, 00 00 00 00, 00 00 00 00
0x10 Z1_CSMKEY0 -- -- -- --
0x12 Z1_CSMKEY1 -- -- -- --
0x14 Z1_CSMKEY2 FF FF FF FF
0z16 Z1_CSMKEY3 FF FF FF FF
0x18 0F 00
0x19 Z1_CR 60 00 0x0060 -> 0 ( Not All zero), bit 4 = 0 ( 0 -CSM Passwords are not all ones.), bit 5 = 1 (UNSECURE), bit 6 = 1

0x1A Z1_GRABSECTR 55 55 55 35
0x1C Z1_GRABRAMR 55 55 00 F0

0 Vivek Singh over 6 years ago in reply to Anil Singhal

TI__Guru** 115271 points

Ok, that looks good. Also can you confirm that you are assigning the semaphore to Zone1 before doing the flash operation? Please refer "Table 3-245. FLSEM Register Field Descriptions" in TRM for detail about this.

Vivek Singh

0 Anil Singhal over 6 years ago in reply to Vivek Singh

Intellectual 810 points

I am a little confused here. Reading the description, I thought we are talking about Flash Pump Semaphore. Is this a different register?

0 Vivek Singh over 6 years ago in reply to Anil Singhal

TI__Guru** 115271 points

No, it's flash semaphore for security. Pump semaphore is different.

Vivek Singh

0 Anil Singhal over 6 years ago in reply to Vivek Singh

Intellectual 810 points

Ok.. I am looking at TRM now.. but I don't understand the words written in the manual.
1. What are "Flash Wrapper registers"?
2. Could you please tell me the values that should be written to this register if I am using Zone1 only.
3. When do we release this semaphore?
4. Is there an example?

BTW.. thanks for you quick responses!!

0 Anil Singhal over 6 years ago in reply to Anil Singhal

Intellectual 810 points

Is programming to 0x11 would cover all cases i.e Z1 & Z2.

0 Vivek Singh over 6 years ago in reply to Anil Singhal

TI__Guru** 115271 points

You need to program "01" for Zone1.

Regards,

Vivek Singh

0 Anil Singhal over 6 years ago in reply to Vivek Singh

Intellectual 810 points

here is my code .. still did not work.
extern "C" void unlockZone(void)
{
DcsmCommonRegs.FLSEM.dw = 0xA501;
}

where DcsmCommonRegs are located at 0x05F070.

0 Anil Singhal over 6 years ago in reply to Anil Singhal

Intellectual 810 points

I added the following and it worked!!
extern "C" void unlockZone(void)
{
EALLOW;
DcsmCommonRegs.FLSEM.dw = 0xA501;
EDIS;
}

0 Vivek Singh over 6 years ago in reply to Anil Singhal

TI__Guru** 115271 points

Yes, address is correct. Did you read back to confirm value "01" was written ? If you are not reading "01" after write then add EALLOW EALLOW before writing to this register and see if that fixes it.

Regards,
Vivek Singh

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TMS320F28379D: DCSM - Unable to Program Flash when only Emulation Code Security Logic (ESL) locked.