TMS570LC4357: Halcogen FREERTOS

Kishor Vitalkar

Prodigy 120 points

Part Number: TMS570LC4357

Is it possible to check previous function calls/ commands in debug window?

I am hitting data abort exception I would like to know which exact function and command causing the issue.

Regards,

Kishor

over 3 years ago

0 QJ Wang over 3 years ago

TI__Guru**** 196776 points

H Kishor,

If the data abort is a synchronous abort, the CP15 DFAR register shows the target address of the access. R14_abt – 8 points to the instruction that caused that access.

If it is a asynchronous abort, we are not able to trace the exact location that resulted in the abort. We cannot use the DFAR register which is used in Synchronous Faults. In general, “store” instructions to areas with “Normal” or “Device” memory attributes causing an error are asynchronous.

How to track instruction that caused the asynchronous data abort?

R14_abt – 8 is a location near the instruction that caused the exception.
Find a “store” instruction near R14_abt – 8, which can likely cause the exception.

0 QJ Wang over 3 years ago in reply to QJ Wang

TI__Guru**** 196776 points

Please check the value of the CP15 Data Fault Status Register (DFSR) to see if it is sync or async abort:

DFSR Register The Figure bellow shows the DFSR register bit assignments:

Use the “S” Bit [10] and “Status Bits” [0:3] to understand the nature of the Data Abort. See Table below for status description:

0 Kishor Vitalkar over 3 years ago in reply to QJ Wang

Prodigy 120 points

Please find the register value in image,

Please suggest the steps to resolve the issue,

Regards,

Kishor

0 Kishor Vitalkar over 3 years ago in reply to Kishor Vitalkar

Prodigy 120 points

R14_abt register status as in below image.

Regards,

Kishor

0 QJ Wang over 3 years ago in reply to Kishor Vitalkar

TI__Guru**** 196776 points

Hi Kishor,

What is the instruction at 0xEDEC (0xEDF4-0x8)?

0 Kishor Vitalkar over 3 years ago in reply to QJ Wang

Prodigy 120 points

Can you please let me know how to check it?

0 QJ Wang over 3 years ago in reply to Kishor Vitalkar

TI__Guru**** 196776 points

In CCS->View, open "disassembly" window, type 0xEDEC, the window will show the instruction at this address.

0 Kishor Vitalkar over 3 years ago in reply to QJ Wang

Prodigy 120 points

Thank you very much please refer the image,

Regards,

Kishor

0 QJ Wang over 3 years ago in reply to QJ Wang

TI__Guru**** 196776 points

The status is b00001, which means alignment fault.

Any unaligned access to Device or Strongly Ordered memory generates an alignment fault. For example, a load of a word (32-bit) from Strongly Ordered or Device memory addresses 0x1, 0x2, 0x3, 0x5, 0x6, or 0x7 generates an alignment fault.

0 QJ Wang over 3 years ago in reply to QJ Wang

TI__Guru**** 196776 points

Add a breakpoint at this address, and check the value of R0 when code executes to this breakpoint.

0 Kishor Vitalkar over 3 years ago in reply to QJ Wang

Prodigy 120 points

Thank you very much,

I hope below image helps

Regards,

Kishor

0 QJ Wang over 3 years ago in reply to Kishor Vitalkar

TI__Guru**** 196776 points

Hi Kishor,

The R0=0x..8 which is 32-bit aligned. I think it should be ok.

0 Kishor Vitalkar over 3 years ago in reply to QJ Wang

Prodigy 120 points

Then what is possible root cause for data abortion? and how to fix it?

0 Kishor Vitalkar over 3 years ago in reply to Kishor Vitalkar

Prodigy 120 points

What is the next step to resolve the issue?

0 QJ Wang over 3 years ago in reply to Kishor Vitalkar

TI__Guru**** 196776 points

Hi Kishor,

I used box (https://txn.account.box.com/) to upload files with my customers. If you have box account, you can upload to box and share it with me. Thanks

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TMS570LC4357: Halcogen FREERTOS