[Xenomai] Rtdm driver debugging techniques.

[Xenomai] Rtdm driver debugging techniques.

[mohammad khalid shaik]

I have a question related to debugging techniques used in xenomai.

I have a pcan-pci rtdm driver which i would like to debug in xenomai
environment.
Can any one let me know what are all techniques available for debugging
rtdm drivers in xenomai?

Regards,
Khalid

Re: [Xenomai] Rtdm driver debugging techniques.

[Gilles Chanteperdrix]

On 06/12/2012 06:59 AM, mohammad khalid shaik wrote:
> I have a question related to debugging techniques used in xenomai.
> 
> I have a pcan-pci rtdm driver which i would like to debug in xenomai
> environment.
> Can any one let me know what are all techniques available for debugging
> rtdm drivers in xenomai?

You can debug with printk

And the I-pipe tracer may come in handy (when you detect a bug trigger a
trace freeze, with some backlog, you are able to know what functions
were called before that).

-- 
                                                                Gilles.

Re: [Xenomai] Rtdm driver debugging techniques.

[mohammad khalid shaik]

Thanks for your quick reply. I have one more question. whether kgdb setup
which is handy to debug the linux kernel can be used to debug xenomai?

Re: [Xenomai] Rtdm driver debugging techniques.

[Gilles Chanteperdrix]

On 06/13/2012 10:32 AM, mohammad khalid shaik wrote:
> Thanks for your quick reply. I have one more question. whether kgdb setup
> which is handy to debug the linux kernel can be used to debug xenomai?
> 

>From recent posts:
http://www.xenomai.org/pipermail/xenomai/2012-June/000199.html

It appears the I-pipe patch does not work with kgdb.

-- 
					    Gilles.

Re: [Xenomai] Rtdm driver debugging techniques.

[Jan Kiszka]

On 2012-06-13 10:49, Gilles Chanteperdrix wrote:
> On 06/13/2012 10:32 AM, mohammad khalid shaik wrote:
>> Thanks for your quick reply. I have one more question. whether kgdb setup
>> which is handy to debug the linux kernel can be used to debug xenomai?
>>
> 
>>From recent posts:
> http://www.xenomai.org/pipermail/xenomai/2012-June/000199.html
> 
> It appears the I-pipe patch does not work with kgdb.

For older x86, I've a working branch here:

http://git.kiszka.org/?p=ipipe.git;a=shortlog;h=refs/heads/queues/2.6.35-x86-trace-kgdb

The plan is to get the required bits into some I-pipe core-3.x once time
permits.

However, if you are on x86 and have test platform with VT-d or AMD IOMMU
at hand, running Xenomai as KVM guest and passing the PCI adapter
through will enable faster source-level debugging than kgdb can provide.

Jan

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