[okl4-developer] Debugging tips for a new platform

[Geoffrey Lee]

On Thu, Jun 19, 2008 at 02:09:16PM +1000, Joshua Root wrote:

>
> Right, I actually have a new ixp4xx platform subdir. I'd be interested  
> in documentation for the attributes you can set in machines.py actually,  
> particularly which ones affect pistachio.

I think at the very least you need the memory map and subplatform
if there is one.  Building with project=l4test should get you
as close as to finding out the minimum the kernel requires.

>
>> The head.spp should work unmodified, we utilize the PXA-based
>> gumstix extensively.  That runs in little endian though, but I don't 
>> think that is the specific issue.
>
> Right, I have endian = "big" so it looks like it should do the right  
> thing. I was just wondering because the slug is a little different to  
> the gumstix.
>
>> I just took a brief look at the Skyeye source code and it seems there
>> is support for running in big endian mode.  If you specify the -e
>> parameter it infers it from the ELF file automatically.  You may
>> want to take a look whether it is worth trying out Skyeye, as
>> it can give you instruction traces, and from there, you can narrow
>> down where to look further.
>
> I actually tried that, but it dies with "elf_checkFile failed: -3". Any  
> idea what that means? Getting it running in the simulator would  
> certainly be the quickest way forward.

A return -3 means the architecture as read in from the ELF file 
is not supported.  Perhaps this is a bug in Skyeye?

	-gl

>
> I've put up a diff between the 2.1.1-fix7 release and what I have now,  
> if you want to have a look:  
> <http://www.cse.unsw.edu.au/~jmr/okl4-ixp4xx.diff>
>
> Cheers,
> Josh
>

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