Problem with Cortex A8 AM3359 SYS BIOS Exception

Michael Rinker

Other Parts Discussed in Thread: AM3359, SYSBIOS

Hey,

I am working with an AM3359 and trying to build an ehterCAT- Application.

when I write one Object, I got the following exception.

[CortxA8] 0x80021c30.
Task stack base: 0x80021c78.
Task stack size: 0x800.
R0 = 0x00000000 R8 = 0xffffffff
R1 = 0x00000000 R9 = 0xffffffff
R2 = 0x00000000 R10 = 0xffffffff
R3 = 0x00000000 R11 = 0xffffffff
R4 = 0xffffffff R12 = 0x80038824
R5 = 0xffffffff SP([CortxA8] R13) = 0x80022350
R6 = 0xffffffff LR(R14) = 0x80007cd4
R7 = 0xffffffff PC(R15) = 0x40a570a4
PSR = 0x8000019f
ti.sysbios.family.arm.exc.Exception: line 170: E_prefetchAbort: pc = 0x40a570a4, lr = 0x80007c[CortxA8] d4.
xdc.runtime.Error.raise: terminating execution

any ideas?

Thanks.

over 13 years ago

0 Frank Walzer over 13 years ago

TI__Mastermind 44306 points

Michael,

no idea. This is not enough info for us. Please specify:

- board type, rev
- IA-SDK version used
- Is this a TI example or a new project?
- what does 'write one object' mean?

Regards.

0 Michael Rinker over 13 years ago in reply to Frank Walzer

Intellectual 720 points

Board Type TMDXICE3359

1.0.0.4

It is based on the example

I want to write acyclic data to an CoE Object. EtherCAT specific. Reading the object works. I have checked the data types, but cant find anything wrong.

0 Frank Walzer over 13 years ago in reply to Michael Rinker

TI__Mastermind 44306 points

So you need to continue debug...

Use the PC value from above log and check via disassembly where the issue occurs. Based on that you can set a breakpoint just slightly before the issue occurs. Then have a look at regs and such during single stepping. I assume some pointer or alignment issue but without the code and debug this is very hard to say.

Regards.

0 Ashish Kapania over 13 years ago

TI__Mastermind 21645 points

Hi Michael,

Michael Rinker said:

Hey,

I am working with an AM3359 and trying to build an ehterCAT- Application.

when I write one Object, I got the following exception.

What kind of object are you referring to ?

Can you post your application's .map file ? The .map file should be in your application's Debug or Release folder (depends on whether you are building a debug or release config) in CCS Project Explorer. The PC/R15 value in the exception dump suggests your code is jumping to an invalid/un-mapped memory address. I can confirm that once I look at the .map file.

Best,

Ashish

0 Frank Walzer over 13 years ago in reply to Ashish Kapania

TI__Mastermind 44306 points

Ashish,

good catch. I missed that the PC is not really valid...

This could mean that the 'object write' uses a bad pointer and actually writes to instruction memory instead of valid variable memory.

Regards.

0 Michael Rinker over 13 years ago in reply to Frank Walzer

Intellectual 720 points

Ok. Can I send you the file with a email?

0 Ashish Kapania over 13 years ago in reply to Michael Rinker

TI__Mastermind 21645 points

You can attach the file to a forum post.

0 Michael Rinker over 13 years ago in reply to Ashish Kapania

Intellectual 720 points

3704.ecat_appl.zip

thanks.

0 Ashish Kapania over 13 years ago in reply to Michael Rinker

TI__Mastermind 21645 points

Hi Michael,

I confirmed that the program is jumping to some invalid address. I agree with Frank, you need to do some more debugging here. From the LR/R14 register it looks like the last instruction that was executed before the exception got triggered was at address 0x80007cd4. This instruction should be somewhere in the CalibWriteEvent() function in your application. I am guessing you are writing the object you were referring to earlier, inside this function. You can put a breakpoint few instructions before 0x80007cd4 and run till it hits. Then single step through the code and observe whats going wrong using disassembly and register view.

Best,

Ashish

0 Michael Rinker over 13 years ago in reply to Ashish Kapania

Intellectual 720 points

hey,

it was a problem with a function and some variables, that were called there. Trying to find it.

Thanks for your help.

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Problem with Cortex A8 AM3359 SYS BIOS Exception