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Hi, sorry for the delay. It seems that the board I was going to use for UART died, so it seems that I'll have to wait until I get UART cable to debug my boot issues.

I have identified the pins with a multimeter as you suggested. Tomorrow I will attempt to read the boot log using an Orange Pi and will report the results. Again, thanks for your help!

I attached some images of my board to this post. By the way, I attempted to run /root/install.sh and everything but the last step succeeded (fw_setenv fails with 'invalid argument"). If I attempt to reboot into the system partition I get a black screen. I guess this is another thing for which I need UART, no?

Thanks, that worked! I don't have any UART adapter. However, I have some microcontrollers which I might use as ad-hoc converters. I found a 4-pin header in the box, which I suspect is the UART, but I cannot find any labels indicating which one is Tx, Rx, GND, etc... (I am a bit visually impaired, so maybe I'm not seeing them). Thanks a lot for your amazing work and help!

Hi, I have a (very old) K200 (AML S802) device. I've got it to boot the Ubuntu Bionic Server image found here (mantained by @balbes150): https://yadi.sk/d/wc2jqGsHuKy48/Armbian/5.44. The image comes with some DTBs, but none of them are for K200. However, the one for K200B 1G SDIO eMMC mostly works. I have working HDMI with no overlay and wired networking works. So far, I've only found two issues: - Wi-Fi doesn't work (not a great deal for my purposes anyway). - For some reason, U-boot just kind of freezes if the HDMI output is notconnected. Is the DTB file I'm using causing this? If so, where can I get a proper one (I have searched but not found anything). Thanks! Edit: I've studied this a bit further and learned to extract dtbs from the stock Android image. This did help with a few other problems that I had (1G of RAM wasn't being detected, etc), but the HDMI-during-boot and Wi-Fi issues still persist. Suposedly, this means that the dtb isn't the source of the problems, since I am using the stock one, right?