can you repost those edid files you created? thank you!First time user, here. I managed to get 480i on boot.
You may need to use "sudo rpi-update" to get the interlaced fix that @6by9 worked out - props for that! Until the apt release hits 6.6 or whatever it was.
Then simply add "drm.edid_firmware=HDMI-A-1:Rpi480i_EDID.bin" to the end of the line in your cmdline.txt, after adding the EDID bin file with that name to your /usr/lib/firmware/ directory. You do not need to add a "video=" parameter. This pushes 480i out the HDMI-A-1 port for you to convert to RGB, for example using any standard AG6200-based HDMI-to-VGA converter same as you would for the MiSTer. Change the filename if you want 240p (it's 640x240p, can't seem to get true 240p). (I have also been unable to get C-sync, just H+V).
EDID files are here https://gofile.io/d/CHSUz6 (EDIT: or, better, with HDMI audio added to the EDID's - https://gofile.io/d/kyHVw5)
As a side note, @6by9, i found that without an EDID override as above, any "video=" command in the cmdline.txt file is ignored. Not just for 480i, but for anything - I couldn't change modes to something in my LCD's EDID (like 800x600) the kernel just loads whatever it thinks is best. (I did find a weird exception using "video=" with 240i at 60Hz which got linedoubled, but this probably isn't relevant). Which i think means, among other things, that you can't ever use "Video=HDMI-A-x:NTSC".
Should i file an issue about that, or is it just me doing something wrong? I did try changing "disable_fw_kms_setup" between 1 and 0 in the config.txt file, but perhaps not at the right moment to fully test the above assertion?
Statistics: Posted by kevhanks — Mon Sep 16, 2024 11:50 pm