robertoj

I am glad that you made it work. However, it looks like you are using another Debian Distro for RiscV, not Armbian (not a bad thing) I am continuing the conversation over there

At this time, panel-mipi-dbi is the most universal way of using these SPI LCDs. Even the Raspberry community gets this recommendation (except for Waveshare LCDs). Bhupiister, does the MilkV Duo S really have 512MB RAM? How do you deal with that? I have used an orange pi zero LTS with 512MB of RAM with LXDE desktop in the past, but only with lightweight GUI applications. Does it really have a useful TPU?

There's a 4 inch RED ili9488 in aliexpress. VERY RECOMMENDED. It may be shown as ili9486, correctly or incorrectly, but it doesn't matter. I have seen both ili9486 and ili9486 work with the same panel-mipi-dbi driver, settings and init firmware. At least in orange pi zero 3, some pins worked fine for GPIO and others didn't. Also make sure to use the default chip selects in your MilkV Duo 5, and not try to change that. Also share what Armbian and Linux version you are using.

Deactivate spi-dev in the armbian-config. That DTS is only used if you want to run a userspace program to talk to the LCD. In this case, we want the linux kernel to talk to the LCD, so we only need to use the LCD driver (ideally not a FBTFT. DRM is preferred)

I only have RED ili9341, ili9486 and ili9488 I don't have time to look right now, but search the Raspberry Pi forum and there's a nice thread with just the RED LCDs, st77** and iliteks working with panel-mipi-dbi driver Then, when you find a solution over there, post the link here. Your objective is MilkV Duo S with Waveshare ili9488 LCD, right?

The waveshare clones may not work with panel-mipi-dbi, because these LCDs are not purely SPI. They have a SPI-to-parallel chip which allows the LCD panel to work in parallel mode. Maybe they will work, but I don't own any waveshare LCD. There's a driver inside the kernel for waveshare SPI LCDs (ILI9486_DRM or something like that), but I still haven't seen any example of anyone using it.

I don't own any waveshare LCD. I am not sure what to suggest, except that I believe it will only work with a "ili9486_DRM" (can't remember the exact name) driver ko. It is made explicitly for waveshare SPI LCDSs, and you must activate within the armbian build script process.

No, it wont work. I have made another thread just for the orange pi zero 3 and ili9488 https://forum.armbian.com/topic/47971-driving-the-ili9488-lcd-40-inch-cheap-chinese-clone/#comment-208446 Change the GPIOs to match your wiring and connections.

I am glad that you have the first 15% done: get your kernel module in the OS, and the uboot accepting the DTBO Now you are stuck in correcting the DTS, so that it configures the SPI pins correctly. My last advice for you (through this stage) is: make sure you don't have anything else using SPI pins. Deactivate "spi_dev" in armbian-config. Since I only had experience with H3 and H618 CPUs, I can't help with confidence. Post your question in the appropriate Rockchip forum section for up-to-date reliable advice. I can say that Radxa/Waveshare DTS is very out of date: it uses the fb_ili9486, which is "framebuffer" (poor fps), instead of the modern "DRM" display driver (high fps, will allow wayland). You should stay with that DTS with fb_ili9486, because it is still the closest starting point for you, and when you have it working, claiming all the GPIO pins needed, I can help again to use the DRM driver panel-mipi-dbi. Regarding MISO and MOSI, I only meant to change that nomenclature in the graphic that you show in the forum. I did't mean to change it in the DTS, if that's how other people make it work. Maybe you need to have the full linux source, so you can decompile the DTBO correctly, showing the gpio pin addresses or symbols. Is it possible that you get the Radxa/Waveshare original DTS?

The first post reads "your mileage may vary" and "the latest kernel will work best" Start by recompiling armbian for your Rockchip SBC, with the edge kernel option, then follow the ffmpeg install instructions If it doesn't work, try the older Ubuntu, and both Debian options

If you already checked "dmesg|grep panel-mipi" and "dmesg|grep spi", check this: * share which LCD you are using. Half of those LCDs are waveshare clones, which need a different driver. My DTS works in the RED LCDs. * Look at the uboot messages in the serial port output. Does it confirm it is finding your dtbo and using it? * verify that panel-mipi-dbi.ko exists in the modules folder. I know it is not preselected by default within the linux configuration menu * Search the word "pinctrl" in this thread https://forum.armbian.com/topic/44191-orangepi-zero-lts-ili9341-tft-lcd-and-later-orangepi-zero-3/#comment-204741 To confirm that the kernel driver is using the gpio and spi pins * send link of the rock3c DTS you are referencing, to see an example of how GPIOs are configured * correct the gpio pin map you shared. Instead of tx/rx, use MOSI, MISO. Highlight and label clearly the CS0, CS1, RESET, DC, IRQ * explain how those gpio numbers gpioX,XX transform into the DTS gpioX XX 1/0 If you at least get noise in the LCD, you are 50% done (and maybe you will get lucky in the last 50%)

Can you copy those dtbo's to /boot/user-overlays (maybe they will need renaming) Then activate them in armbianEnv.txt? https://docs.armbian.com/User-Guide_Armbian_overlays/

Oh I get it. Since you are using another distro with newer versions of everything, my effort to build ffmpeg and mpv in Debian Trixie LOOKS like a backport to you XD upon reading your comment again, I understand the consequences of upgrading ffmpeg from source (Debian Trixie's ffmpeg is version 7.1.2) According to: https://forums.linuxmint.com/viewtopic.php?t=457495, I would need to check with "apt-rdepends -r ffmpeg"

I thought this was the best way: official latest mpv + pull request i am not trying to backport it. I want to make it work in trixie.

The ffmpeg discussion posted a way to test the code (at the bottom of https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20847 ) *install all the ffmpeg dependencies, then: $ git fetch -u https://code.ffmpeg.org/Kwiboo/FFmpeg v4l2request-v3:Kwiboo-v4l2request-v3 $ git switch Kwiboo-v4l2request-v3 * compile and install Then rebuild mpv+PR14690 (https://forum.armbian.com/topic/32449-repository-for-v4l2request-hardware-video-decoding-rockchip-allwinner/page/5/#findComment-226567)