USB device debugging

[Narasimha M]

I am attaching the raw data in two cases (working - 2.mon.out) and not
working (1.mon.out) files.

working one is with the device having linux 3.10.20 and not working
one is with linux 2.6.32. Here i have run same traffic in both the
cases.

Could you please suggest some pointers based on these.

On Wed, May 25, 2016 at 8:54 PM, Narasimha M <mnarasimha786 at gmail.com> wrote:
> If possible yes, i need a help. I am working on it for the first time
> on usb subsystem. I just tried using usbmon also, i got some raw data
> in text file. Could you please let me know how it will help to debug
> further?.
>
> One more observation is that if i decrease the mtu size to around 480,
> then i am able to run the traffic. Which means the data is getting
> corrupted after 480 bytes length or so. Is there any possible chance
> for this case?
>
>
> On Wed, May 25, 2016 at 6:26 PM, Bjørn Mork <bjorn at mork.no> wrote:
>> Narasimha M <mnarasimha786 at gmail.com> writes:
>>
>>> Thanks for clear explanation. Could you please let me know where does
>>> host_controller will be present is it in USB device or USB core part
>>> of kernel.
>>>
>>> Actually my issue is that we ported Gobinet driver from open source to
>>> support one dongle. After porting, it is working fine on little endian
>>> host (linux-2.6.31 kernel). We have added some changes in driver code
>>> o support it for big endian hosts. After adding the changes with the
>>> help of le16_to_cpu () function dongle is working in one of our big
>>> endian hosts (which has linux-3.10.20), but facing corrupted packet
>>> issue in other bigendian supported host (linux-2.6.32). Could you
>>> please help in providing some pointers here
>>
>> Sounds like you have a bug in your code.  Did you expect me to make a
>> more precise guess?
>>
>>
>> Bjørn
>
>
>
> --
> Narasimha



-- 
Narasimha
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 1.mon.out
Type: application/octet-stream
Size: 58948 bytes
Desc: not available
Url : http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20160525/a254517c/attachment-0002.obj 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 2.mon.out
Type: application/octet-stream
Size: 175901 bytes
Desc: not available
Url : http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20160525/a254517c/attachment-0003.obj