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Observer mgillott
Observer
4,677 Views
Registered: ‎06-11-2014

How to diagnose Zedboard BTRD vdma Stream On failure ?

Hi

 

I am experimenting with the port of zynq base targeted ref design to zedboard provided by Xylon

 

The prebuilt image works fine.

 

When I try to recreate the hardware, petalinux OS and apps using the tools and provided sources, everything works up until the call to turn on the video stream with ioctl(VIDIOC_STREAMON..) which fails

 

I found I can turn on debug messages from the v4l2 layer using :-

                           echo 10 > /sys/module/videobuf2_core/parameters/debug

and when I do this I can see the messages :-

....
vb2: vb2_buffer_done: done processing on buffer 0, state: 3
vb2: vb2_buffer_done: done processing on buffer 1, state: 3
vb2: vb2_start_streaming: driver refused to start streaming

 

so I guess this is a problem in the xilinx video driver. (vdma / tpg / vtc)

 

My question is, how can I dig into this further to find the root cause  ?

 

Thanks

Malcolm

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Observer xylonsupport
Observer
4,379 Views
Registered: ‎05-14-2013

Re: How to diagnose Zedboard BTRD vdma Stream On failure ?

Hi Malcom,

Could you send us the whole Linux kernel boot log?

Regards,
Xylon Support
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