I'm using the integrated video-adc of the iMX6 SoloX. In both U-Boot and Linux Kernel the VADC performs an auto-detection of the video-standard (PAL/NTSC). I would like to have that pre-configured to save time and to handle weak/noisy signals better. How can I do that? I checked the documentation and found the "Manual Override (VDEC_MANOVR)" register, but the documentation is very minimalistic. I guess the "pal_override" and "pal_manual" flags are supposed to do that but I don't fully understand how. Unfortunately both UBoot and linux-kernel don't use this register at all so there is also no way to look it up.
Long story short: how do I force the VADC to use PAL or NTSC?