It's not clear about their relationship.
base on Linux
I can change fb0's alpha to control show fb0 or fb1. And I can get their data by use "cat /dev/fb0" or "dd if of".
But what is overlay? How can I get it's data? What are their function, video16 and video17?
HI zhang
V4L2 devices are registered as videoN and described in V4L2 documentation, like
16. The ivtv driver — Linux Media Subsystem Documentation documentation
fbN are provided in dts files (linux/arch/arm/boot/dts)
for overlay one can check documentation in imx-test, mxc_fb_test
www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-test-5.7.tar.gz
and presentation
A Deep Dive into Image Processing for i.MX 6 Series Applications Processors
Best regards
igor
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