TMS320F280049-Q1: device resetting randomly , FLUNCERR = 1 error in flash

Colombo Carlo

Part Number: TMS320F280049-Q1
Other Parts Discussed in Thread: UNIFLASH

Hi everybody ,

I program my device using UNIFLASH , and my code in same cases can do flash programming .

now randomly on few devices I can see them resetting randomly . I checked and saw the FLUNCERR = 1 so it seems a flash no correctable error .

I m programming myself ECC when writing w API .

some questions :

- how can I properly detect the flash address/locations causing the error ? I want to understand if failing location is the same on all devices

-how to detect if more than one location is failing ?

-do you have any sw example to cause this kind of error ? so I can try to force and reproduce the issue and see if it is the root cause of my random resets

- do you have any suggestion / info on be sure I use properly Uniflahs and not causing the problem myself ?

any suggestion or test to run ?

thank you

Carlo

over 1 year ago

0 Vamsi Gudivada over 1 year ago

TI__Guru* 86860 points

Carlo,

As discussed offline,

1) Please review ECC error registers (3.14.14 FLASH_ECC_REGS Registers) in TRM. It has the registers that show you the uncorrectable error address.

2 and 3) Simply read the entire flash with code running from RAM. Do this with Flash ECC enabled (ECC_ENABLE register). This will cause the error locations to be captured.

4) I don't think this is because of UniFlash programming. Hope Auto ECC Generation is enabled in the GUI - you can check and confirm.

Thanks and regards,
Vamsi

0 Colombo Carlo over 1 year ago in reply to Vamsi Gudivada

TI__Mastermind 22145 points

Hi Vamsi

about N2 please do you have a ready to use code to do and reveal the "bad" flash location ? it would be great help

thank you

Carlo

0 Vamsi Gudivada over 1 year ago in reply to Colombo Carlo

TI__Guru* 86860 points

Carlo,

Sorry, I don't have the code.

Thanks and regards,
Vamsi

0 Colombo Carlo over 1 year ago in reply to Vamsi Gudivada

TI__Mastermind 22145 points

HI Vamsi ,

please some doubts I need your help on this :

---Did ECC error occur when I read flash data in my code ? Or when I write data to flash?

As I know, ECC error occurs during a flash access.

---What dose DSP do for ECC check? Calculate a block of flash data CRC?

He are answers to some previous questions:

1 Are they programming ECC for the data when they use the flash API in their application?

--I didn’t program ECC.

Are they getting errors at different addresses? Or only at one address in all the failing units?

-- didn’t get other errors yet.

Does their application read TI-OTP? Hope they don't.

-- didn’t read TI-OTP

Is their application ending up in NMI ISR due to the flash ECC error?

ECC error was found when I read flash data through Uniflash. And no other bit was found yet.

So I consider it may be the cause of ending up.

So I want clearly to know what kind of flash process (in my code I do, or DSP do) will causeECC error?

coudl you kindly help ?

thank you

Carlo

0 Vamsi Gudivada over 1 year ago in reply to Colombo Carlo

TI__Guru* 86860 points

Carlo,

New Q1) Did ECC error occur when I read flash data in my code ? Or when I write data to flash?

Answer) Error gets indicated when code/data is fetched/read from the flash bank.

New Q2) What dose DSP do for ECC check? Calculate a block of flash data CRC?

Answer) Flash's 64-bit aligned address, 64-bit data and the corresponding 8-bit ECC data are sent to the flash wrapper's SECDED logic. SECDED logic will generate ECC for the given address and data and issues an error if the corresponding ECC does not match. Please suggest them to read the TRM's flash chapter for more details.

Regarding their answers for our questions.

1) If they don't program ECC, they will get ECC errors when that code/data is fetched/read. They can use Fapi_AutoEccGeneration programing mode - this will calculate and program the ECC for them. Please review the flash API example/guide.

2) Does this mean, they got error only at one address? If so, what is that address? Did they program that address using the flash API at runtime in their application?

3) ok.

4) ECC error occurred while reading from UniFlash?? Do they mean, they saw the ECC error registers through UniFlash?

5) If they can tell the address at which the error occurred + how they programmed it (API or UniFlash), then I can help them further to debug. I feel they might have programmed incorrectly using the flash API.

Here are couple of FAQs that may help them:

1. [FAQ] FAQ on Flash API usage for C2000 devices:

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/951668

2. [FAQ] FAQ for Flash ECC usage in C2000 devices - Includes ECC test mode, Linker ECC options:

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/951658

Thanks and regards,

Vamsi

0 Vamsi Gudivada over 1 year ago in reply to Vamsi Gudivada

TI__Guru* 86860 points

Carlo,

Please note: I am out of office until February 23rd. Please reply on February 23rd if you have further questions.

Thanks and regards,

Vamsi

0 Colombo Carlo over 1 year ago in reply to Vamsi Gudivada

TI__Mastermind 22145 points

HI Vamsi

I shared code offline

thank you

BR
C

0 Vamsi Gudivada over 1 year ago in reply to Colombo Carlo

TI__Guru* 86860 points

Hi Carlo,

User commented out the Example_Error() and FMSTAT_fail() function calls. How can they confirm whether or not the data got programmed correctly if that code is commented out?