[meta-freescale] Video overlay on sabresd
Nikolay Dimitrov
picmaster at mail.bg
Tue May 19 09:16:31 PDT 2015
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 in advance. Regards,
Nikolay
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