Kuosti

@Kajen I can confirm the right pin is in fact different! For me its PI9. 3 days wasted on diagnosis but at least HDMI is in working state 😂

Ok, i built an Armbian v25.05 image with kernel 6.12.11-edge-sunxi64. I used the 158-add-pendoo-x12pro-defconfig.patch for uboot and @Kajen DTS above for kernel patch. HDMI still doesn't work, but the system is stable, ethernet works and the blue power led works too. According to H616 datasheet PI0 is SCL, PI1 SDA, and PI2 is CEC for HDMI so i added them to pinctrl node in dtb to claim them hdmi-pins { pins = "PI0\0PI1\0PI2"; function = "hdmi"; phandle = <0x90>; }; And then these to hdmi@6000000 pinctrl-names = "default"; pinctrl-0 = <0x90>; But i still get "Cannot find any crtc or sizes", and when i force the HDMI on with extraargs=video=HDMI-A-1:1920x1080@60e in /boot/armbianEnv.txt i get "PHY PLL failed to lock". Maybe this board needs some specific kernel fixes? Im a total n00b at tv boxes and Linux kernel so my knowledge is extremely limited... Also, in /sys/kernel/debug/clk/clk_summary the HDMI clock is apparently 172615385Hz which is too high for 1920x1080@60. It is supposed to be 148500000Hz. I think that would explain why PHY PLL fails to lock but i don't know how to fix this.

@Kajen Did you get HDMI working? I have a box very similar to yours (Transpeed 6K T98 H616) and i have been trying to get HDMI for a couple days without success. For me the only ARM Linux image that boots is a MiniArch image for pendoo x12 pro that has 7.1.1 kernel. The kernel detects the HDMI TX controller v2.12a after which it reports: sun4i-drm display-engine: [drm] Cannot find any crtc or sizes. I also tried to build custom Armbian image with custom CSC and patch files but i didn't get any of the images to boot the kernel. My specs: - AXP305 PMIC - 2 GB DDR3 Micron D9LGX - 32 GB eMMC KMR21000BM-B809 - AW859A Wireless module Pic of PCB: https://imgur.com/a/higrm6v