Hello, everybody.
I would be grateful if someone could tell me where can I find any description about VID1 device settings via bootargs. I mean how to correctly tune it.
The issue is that I executed fbdev_loopback example application from DVSDK and with different bootargs I got working and not working application.
For example, nothing works when I set the size of the buffer for VID1 more than 6 Mbyte (in docs it was written that buffers' size shouldn't exceed 40 Mbyte if I'm not mistaken). But with the resolution 720x576x16 6 Mbyte is not enough as the picture is blinking. I think the buffer size should be twice more than the whole number of bytes for one frame (double buffering). With the resolution 720x576x8 it doesn't work too. With smaller resolution and double buffering it is OK (although I commented FBIO_SETPOS and FBIOPUT_VSCREENINFO ioctls - it always leads to errors).
Is there some description of constraints of fbdev_loopback buffering sizes?
And is it something to do with FBIO_SETPOS and FBIOPUT_VSCREENINFO ioctls' errors?
Thank you.