On Sun, Jul 21, 2019 at 2:38 PM João Manoel <[email protected]> wrote: > > I could get the i2s with my LCD adding this line to uEnv.txt: > > uboot_overlay_addr0=/lib/firmware/BB-HDMI-TDA998x-00A0.dtbo > > Doing this, I am making the LCD-HDMI converter work, and not allow the > BB-CAPE-DISP-CT4 load. As my LCD is connected to the same pins that the HDMI > converter is connected, my LCD just works. > > I now have an HDMI output, and the LCD working at the same time with i2s > audio on the right pins. > > I don't think that this is the best solution, this is just a turn around to > make it works. I also forced a resolution to match with my LCD with the line: > > cmdline=coherent_pool=1M net.ifnames=0 quiet video=HDMI-A-1:480x272M@60e > > With this, my HDMI video doesn't work, because the resolution is not > compatible, but my LCD still working, and I still have i2s audio. > > If someone knows a better solution for this, please, let me know. > > I tried to recompile the dtbo of my LCD adding some of the fragments from the > HDMI overlay mentioned, but I couldn't make it work. I couldn't find a good > documentation about how these overlays, and device trees works on the board. > > If someone can point me good documentation about it I will appreciate. > > I'm posting it because I think that there is so little documentation for > beginners about the BeagleBoard that anything can help someone that is a bit > lost. Even simple things on this board are complicated and the documentation > that you can find are most of them outdated with the old cape system, that > doesn't work anymore. This just confuses the people.
IDK, you did pretty good for someone who took a cape that utilized the audio pins for the i2c based touch-controller on the BB-CAPE-DISP-CT4 lcd, and made it work for your application.. Another option would have been gotten a different lcd. Do a direct comparision of these two overlays: https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-NHDMI-TDA998x-00A0.dts https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-HDMI-TDA998x-00A0.dts To see what you need to modify in: https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-CAPE-DISP-CT4-00A0.dts Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYgTsXFD7emZ0z2aY7TCcKU8Ec%3DNfyYwu96E%2B3ugCy2Qag%40mail.gmail.com.
