v4l2 capture: slave not found!

rebelalliance — Fri, 02 Aug 2013 18:28:10 GMT

I have switched my hardware from the SabreSD Board w/ i.MX6Q to SabreSD Platform w/ i.MX6Q.

I am using ltib from L3.0.35_4.0.0_ER_SOURCE.tar.gz to build my kernel and rootfs from scratch.

I used the same SD card with the same rootfs/bootloader/kernel that I was using to boot the SabreSD Board and used it to boot the SabreSD Platform. Everything went fine except now I am trying to get video from the ov5640 MIPI camera using the pipeline "gst-launch mfw_v4lsrc ! mfw_v4lsink" and I get the following output on my dmesg:

camera ov5640_mipi is found

ERROR: v4l2 capture: slave not found!

Of course I have modprobed the drivers; my lsmod shows:

Module Size Used by

mxc_v4l2_capture 21621 1

ipu_bg_overlay_sdc 3925 1 mxc_v4l2_capture

ipu_still 1703 1 mxc_v4l2_capture

ipu_csi_enc 2937 1 mxc_v4l2_capture

ipu_fg_overlay_sdc 4856 1 mxc_v4l2_capture

ipu_prp_enc 4685 1 mxc_v4l2_capture

ov5640_camera_mipi 19710 0

camera_sensor_clock 765 1 ov5640_camera_mipi

I checked the file sizes of L3.0.35_4.0.0_ER_SOURCE and L3.0.35_4.0.0_DEMO_IMAGE under

Freescale > i.MX Applications Processors >i.MX 6 Series Processors > RDIMX6SABREPLAT (for SabreSD Platform) and under Freescale > i.MX Applications Processors > i.MX 6 Series Processors > RDIMX6SABREBRD (for SabreSD Board) and found the file sizes to be exactly the same same. Also, I found nothing in the kernel config or ltib config specifically referring to the SabreSD Platform. To the best of my knowledge, SabreSD Board is just a stripped down version of the SabreSD Platform.

So my question is, does the SabreSD Platform and SabreSD Board share the same SDK? And what is causing the ERROR: v4l2 capture: slave not found! message?

Please advise.

Re: v4l2 capture: slave not found!

rebelalliance — Fri, 02 Aug 2013 18:51:51 GMT

Apparently I need to specify the device name to the mfw_v4lsrc plugin because it is a higher layer in charge of all camera sources (parallel and MIPI in case of SabreSD Platform) so this pipeline works with the mipi camera:

gst-launch mfw_v4lsrc device=/dev/video1 ! mfw_v4lsink

topic Re: v4l2 capture: slave not found! in i.MX Processors

v4l2 capture: slave not found!

Re: v4l2 capture: slave not found!