[meta-freescale] Video overlay on sabresd

[Nikolay Dimitrov]

Hi Prabhu,

On 05/19/2015 07:22 PM, Prabhu S wrote:
> How about this?
> /unit_tests/mxc_v4l2_output.out -iw 1024 -ih 768 -ow 1024 -oh 768 -d
> /dev/video17 -fr 30 -l 10 -f YUYV ./your-file.yuyv
>
> /dev/video17 is for overlay
>
> On Tue, May 19, 2015 at 11:16 AM, Nikolay Dimitrov <picmaster at mail.bg
> <mailto:picmaster at mail.bg>> wrote:
>
>     Hi guys,
>
>     I'm trying to get the video overlay working on imx6q sabresd's HDMI.
>     Here's the kernel command line:
>
>     console=ttymxc0,115200 root=/dev/mmcblk2p2 rootwait rw
>     video=mxcfb0:dev=hdmi,1280x720M at 60,if=RGB2
>     4,bpp=32 fbmem=28M
>
>     This is the kernel version:
>
>     # uname -a
>     Linux imx6qsabresd 3.14.28-1.0.0_ga+g91cf351 #1 SMP PREEMPT Tue May
>     19 17:32:51 EEST 2015 armv7l
>     GNU/Linux
>
>     Here are the framebuffer devices nodes:
>
>     # ls -lh /dev/fb*
>     crw-rw----    1 root     video      29,   0 Jan  1  1970 /dev/fb0
>     crw-rw----    1 root     video      29,   1 Jan  1  1970 /dev/fb1
>     crw-rw----    1 root     video      29,   2 Jan  1  1970 /dev/fb2
>     crw-rw----    1 root     video      29,   3 Jan  1  1970 /dev/fb3
>
>     I can write arbitrary data on /dev/fb0 and see it on screen, like this:
>
>     # cat /bin/busybox.nosuid > /dev/fb0
>
>     But I can't write to /dev/fb1:
>
>     # cat /bin/busybox.nosuid > /dev/fb1
>     cat: write error: No space left on device
>
>     I'm assuming that fb0 is the background layer, and fb1 is the
>     foreground IPU layer.
>
>     So the question is - how to make the foreground (fb1) layer working at
>     all? Should I configure mxcfb1 in the bootargs, or it needs some IOCTL
>     in /dev/fb1 to enable the device?

Thanks for sharing. This works, but I'm trying to achieve exactly the
opposite.

I need to have my UI on the FG layer (which imho means X rendering to
/dev/fb1), and my video player must render on BG layer (/dev/video16,
which imho corresponds to /dev/fb0).

At the moment I can't seem to be able to draw anything on /dev/fb1, so
I doubt that Xorg will also run properly on it.

Regards,
Nikolay