"instruction fetch exception" on C6457

Hi Pavan,

The CPU could not fetch an instruction and threw an exception. See Section 6 of  the TMS320C64x/C64x+ DSP CPU and Instruction Set Reference Guide for more details on CPU Exceptions. (6.5.1 talks a bit about fetch exceptions specifically)

The cause can vary quite a bit... maybe it could not access program memory at that time for whatever reason...

ki

Hello,

I am experiencing the instruction fetch exception on a TMS320DM6437 processor.

I am attempting to follow you instructions on

http://processors.wiki.ti.com/index.php?title=DSP_BIOS_Debugging_Tips

I have CCS 4.2 and I'm attempting to see if I have a stack overflow using Method 1. I can open ROV, but I don't see the Kernel Object Viewer.

How do I open Kernel Object Viewer in CCS 4.2?

Tim M

Tim Murtaugh said:

How do I open Kernel Object Viewer in CCS 4.2?

ROV is the right thing.  Here's a quote from the wiki page:

After code has gotten into a bad state, halt the processor and open the DSP/BIOS Kernel Object Viewer (KOV). In CCS 3.3 go to DSP/BIOS -> Kernel Object View. In CCS 4.x go to Tools -> ROV.

I did not get what you meant by  "I can open ROV, but I don't see the Kernel Object Viewer"

If you open ROV from the tools tab you will have to expand the Ti->BIOS->ROV  catogories to see

LOG

MBX

MEM

SEM

SWI

TSK

I would suggest you put a break point in the nmi handler ( see .map file for the location) and have a look at the stack. If you still dont see anything trace back to the routine that may have caused the execption using the NRP and place a break point to see whats happening.

Brad,

I think ROV and KOV are two different things aren't they? In CCS 4.2, I can open ROV (runtime object viewer) but there is no KOV (kernel object viewer). There is no KOV on the toolbar (as shown in the screen shot in the wiki). When I open ROV, a window opens with a tree containing "ti" and "xdc" categories, each of these categories has sub-items, none of which is KOV.

My point is, I'm trying to debug a suspected stack overflow using the method described in the wiki, but I do not have a kernel object viewer as described in the wiki.

Thanks,

Tim

Are you using DSP/BIOS 5.41 or SYS/BIOS 6.x?

CCS 3.3 contains KOV.  CCS 4.x and 5.x contains ROV.  ROV contains the same info as KOV (and more).  Just drill down in there a little bit, e.g. ti -> bios, and you should see the familiar list of components like KNL, TSK, etc.

Brad Griffis said:

CCS 3.3 contains KOV.  CCS 4.x and 5.x contains ROV.  ROV contains the same info as KOV (and more).

Brad is correct. ROV is a new and improved KOV that is in CCSv4 and greater.

Thanks guys, I've got it now.

I'm using CCS version 4.2.0.10018 and SYS/BIOS 6.30.2.42. I found the information I need under ti->sysbios->knl->Task.The information there indicates that I do indeed have a stack overflow.

Thanks for your help.

Tim