I.MX35 PDK

On 3/8/12, Alex Gershgorin [off-list ref] wrote:
...

Yes this I2C problem, all I2C slave device need response to Host CPU by
pulls I2C data bus to low, in other words generate ACK, the clock pulse for
the acknowledge bit is always created by the bus master.

In this case, the camera tries to reset the data bus and generate an ACK,
but the voltage drops to the area of two volts, although it should be reset
to zero.
I replaced R172 with 10K on CPU board and got a good result, but there are
other surprises

Ok, good.

Can you try to change the I2C1 pad settings in software, so that the
board can work with the original resistor?

Linux video capture interface: v2.00
soc-camera-pdrv soc-camera-pdrv.0: Probing soc-camera-pdrv.0
mx3-camera mx3-camera.0: MX3 Camera driver attached to camera 0
ov2640 0-0030: ov2640 Product ID 26:42 Manufacturer ID 7f:a2
i2c i2c-0: OV2640 Probed
mx3-camera mx3-camera.0: MX3 Camera driver detached from camera 0
dmaengine: failed to get dma1chan0: (-22)
dmaengine: failed to get dma1chan1: (-22)
dmaengine: failed to get dma1chan2: (-22)
dmaengine: failed to get dma1chan3: (-22)
dmaengine: failed to get dma1chan4: (-22)
dmaengine: failed to get dma1chan5: (-22)
dmaengine: failed to get dma1chan6: (-22)
dmaengine: failed to get dma1chan7: (-22)
dmaengine: failed to get dma1chan8: (-22)
dmaengine: failed to get dma1chan9: (-22)
dmaengine: failed to get dma1chan10: (-22)
dmaengine: failed to get dma1chan11: (-22)
dmaengine: failed to get dma1chan12: (-22)
dmaengine: failed to get dma1chan13: (-22)
dmaengine: failed to get dma1chan14: (-22)
dmaengine: failed to get dma1chan15: (-22)
dmaengine: failed to get dma1chan16: (-22)
dmaengine: failed to get dma1chan17: (-22)
dmaengine: failed to get dma1chan18: (-22)
dmaengine: failed to get dma1chan19: (-22)
dmaengine: failed to get dma1chan20: (-22)
dmaengine: failed to get dma1chan21: (-22)
dmaengine: failed to get dma1chan22: (-22)
dmaengine: failed to get dma1chan23: (-22)
dmaengine: failed to get dma1chan24: (-22)
dmaengine: failed to get dma1chan25: (-22)
dmaengine: failed to get dma1chan26: (-22)
dmaengine: failed to get dma1chan27: (-22)
dmaengine: failed to get dma1chan28: (-22)
dmaengine: failed to get dma1chan29: (-22)
dmaengine: failed to get dma1chan30: (-22):

This is something that needs to be solved, but it does not prevent the
camera to work though.

On my mx31pdk I get the same dmaengine errors and the ov2640 does work fine.

I think you can go ahead and try to use the camera on the mx35pdk now.

You can try:

gst-launch -v v4l2src device=/dev/video0 !
video/x-raw-yuv,width=320,height=240,framerate=25/1 ! ffmpegcolorspace
! fbdevsink

Regards,

Fabio Estevam