05-03-2016, 02:39 PM
HDMI is getting initialized by the in U-Boot FTD to 1080p@60Hz and the DTB used by the Kernel. You can change it there (needs developer skills and tools) if you want other resolutions.
optargs is supported yes, but the disp.screen0 parameter is not.
optargs is supported yes, but the disp.screen0 parameter is not.