Erica

@balbes150

That image goes dark after uboot. It shows lines on hdmi like usual, then dark, no signal. edp shows nothing. with or without hdmi.

The solution we made is working well. Im having some networking issues at the moment. but will try as soon as I can.

sudo dmesg | grep display ──#(Tue,Jan24)─┘ [ 4.242864] rockchip-drm display-subsystem: bound ff900000.vop (ops vop_component_ops [rockchipdrm]) [ 4.247201] rockchip-drm display-subsystem: bound ff940000.hdmi (ops dw_hdmi_rockchip_ops [rockchipdrm]) [ 4.252389] [drm] Initialized rockchip 1.0.0 20140818 for display-subsystem on minor 1 [ 4.253505] rockchip-drm display-subsystem: [drm] Cannot find any crtc or sizes [ 4.254305] rockchip-drm display-subsystem: [drm] Cannot find any crtc or sizes [ 4.255002] rockchip-drm display-subsystem: [drm] Cannot find any crtc or sizes [ 20.829437] rockchip-drm display-subsystem: [drm] fb0: rockchipdrmfb frame buffer device

I had some problems getting the files over. I have them now. Put the proper UUID into boot.cmd. The overlay is applying, but not working. It booted with no problems, looking for errors and warnings still. I tried it both with and without hdmi plugged in. No edp either way. I tried this overlay. edp.dts

From what I've been able to figure out, DT overlays are not available on some images. The nanopc-t4 being one of them. I tried installing root to nvme, which it seemed to do, but other than copying it to the drive, armbian-install didnt do anything about mounts or boot, so nothing actually changed. But I think it doesnt matter. overlays dont work on this board, unless we can work around it manually.

Apparently this is a result of using nand-sata-install to install from sdcard to emmc. I'm not yet sure how to turn an emmc image into a more ' real' install.

@atone I have armbian installed on emmc or sdcard. Neither seem to work. Both fail with the same reasons shown above. I looked at the add script but didn' t see anything obviously helpful. So Im hesitant to push it forward. I'm not against installing to nvme to try it, but booting from nvme is another thing I havent tackled yet, and Im not sure its even possible. I tried installing Arch to the nanopc-t4 following tmountain' s explanation, but booting from nvme had other problems. I was never able to make it work.

OK. I'm trying it today. We'll see how it goes.

ls -alh /boot ──#(Wed,Jan11)─┘ total 94M drwxr-xr-x 4 root root 4.0K Jan 1 14:15 . drwxr-xr-x 19 root root 4.0K Nov 30 17:18 .. -rw-r--r-- 1 root root 1.5K Jan 1 14:15 armbian_first_run.txt.template -rw-r--r-- 1 root root 38K Jan 1 14:15 boot.bmp -rw-r--r-- 1 root root 250K Jan 1 14:15 config-5.19.17-media lrwxrwxrwx 1 root root 25 Jan 1 14:15 dtb -> linux-image-5.19.17-media drwxr-xr-x 2 root root 4.0K Jan 1 14:15 extlinux lrwxrwxrwx 1 root root 21 Jan 1 14:15 Image -> vmlinuz-5.19.17-media -rw-r--r-- 1 root root 29M Jan 1 14:15 initrd.img-5.19.17-media drwxr-xr-x 4 root root 4.0K Jan 1 14:15 linux-image-5.19.17-media -rw-r--r-- 1 root root 0 Jan 1 14:15 .next -rw-r--r-- 1 root root 6.2M Jan 1 14:15 System.map-5.19.17-media lrwxrwxrwx 1 root root 21 Jan 1 14:15 uInitrd -> uInitrd-5.19.17-media -rw-r--r-- 1 root root 29M Jan 1 14:15 uInitrd-5.19.17-media -rw-r--r-- 1 root root 31M Jan 1 14:15 vmlinuz-5.19.17-media

Linux nanopct4 5.19.17-media #22.11.1 SMP PREEMPT Wed Nov 30 11:08:24 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux

I will follow the instructions on the other thread and see what happens.

I certainly can. Although I'm not sure what to do with the overlay.

yes. here it is. It sort of makes sense, but I don't know what I'm really looking T. ``` rk3399-nanopc-t4.dts ```

Has anyone gotten this to work? I have not. When added to my decompiled dtb, the dts snippet above gives syntax errors which I haven't been able to figure out. One for the gpio enable, which looks OK to me. Then, if I comment `gpio enable` then `&edp` is an error. My understanding is that & is a reference, so I'm not sure how it can be used on the left.

Hello, I have had a nanopc-t4 and a few others for a long time now. I have tried to create a working dtb for it a few different times. My understanding of device trees is superficial I have not had good success. I have read the kernels DT docs many times. I can of course run an ancient 4.19 kernel but I would much rather be at the edge. Currently I've got armbian 22, but no edp. I can boot Friendly's lubuntu and then the edp works. Although it is edp or hdmi not both. I must unplug the edp to get the hdmi port to work. Which is really undesirable. If I remember, it can only enable 2 of its 3 hdmi ports at a time, so that is likely a simple DT change. I am wondering if it is even reasonable to wish for a working edp port with a modern kernel on any arm board. Or if possibly someone has a device tree for it that enables the edp. I have not tried an LTS version of armbian, I'm not familiar with the names and versions. I will look. So I'm wondering if anyone has the edp working or can explain where to look and maybe even why this situation exists where device support is lacking in newer kernels. Any help would be appreciated, Erica