During debug got the exception

Hello,

This issue is handled through private support. To avoid duplication of efforts, you can continue the discussions through private support and we will post the final resolution here.

Best Regards,
Jithul

Hi

Hope you're doing fantastic.

Is there any final resolution for this kind of issue? Perhaps that might help me in troubleshooting my problem.

I'm also  getting exception when I attempt to launch the debug perspective.

In my case exception no is 0x21.

Thanks & Regards

-Siddhant

Hello,

As the issue is not simulated in the Ez-kit, can you please try the below suggestions to avoid exception issue.

Since this is memory protection violation issue, we would suggest you to refer the "Memory Protection and Properties" section in Memory Chapter of programming reference manual to get more information on protection attributes of CPLB to isolate the issue.
www.analog.com/.../Blackfin_pgr_rev2.2.pdf

Can you please see the RETX  register to locate the exact failing instruction and the offending instruction can be examined for further insight into the problem.
Is the instruction accessing  memory which has no valid CPLB definition?
Is the instruction performing a memory load/store from/to a misaligned location?
Does the pointer or index register point to an invalid memory region?

A breakpoint can be set in the vicinity of the instruction that caused the hardware error or exception and the code can be single-stepped while observing the address registers (IxorPx).andler).

And so the exceptions can be caused by many different configurations errors and/or emulator settings errors or corruption of the configuration files. We would still recommend you to first try to clean your project, restart CCES, then do a Build and Debug. We would strongly recommend that you should also try to create a new CrossCore Project and use the default settings for the BF60x and the ICE-1000 or ICE-2000.

Could you please try booting a simple led blink application on your custom board and let us know what is the behaviour on it, because the compiler may produce the exceptions on run time if any memory attributes misses in the CPLB registers.

Are you managing the 'silicon revision setting' as per the processor revision mentioned on the chip in your project? Can you test with 'any' option available in the project properties?

 
Regards,
Lalitha.S

Hi Siddhant,

Could you please provide more information on below points to assist you better on this.

1) Could you please confirm whether any instructions placed in the SDRAM.
For instance,
#pragma section("seg_ext_data"),
void foo_fun ();

If yes, could you please try moving these functions into the internal memory and check if that works without giving any exception?

2) What have you confirmed using the memtest?  Whether you do read and write to all SDRAM memory with different data pattern and frequencies and that got pass. If 'No', could you please do the same and confirm the basic SDRAM access is correct.

3) You mentioned in the previous mail that, "changing the SDRAM chip with one from an older batch solves the issue". Could you please confirm what is the the difference between replaced SDRAM part and the one fails.

Also, can you please check once your SDRAM initialization as per the memory device. The Excel-Sheet available in the below link will help to calculate the correct SDR-/DDR1-/DDR2-SDRAM Controller settings for the Blackfin processors External Bus Interface Unit (EBIU), as well as for the DDR2-SDRAM controller (DMC) for the latest generation Blackfin processors. Additionally, there are few comments inside the document which should be read as well.

Excel sheet can be found in the below mentioned link.
https://ez.analog.com/dsp/blackfin-processors/m/file-uploads/359

Regards,
Lalitha.S