Contents: [Dobrica Pavlinušić's random unstructured stuff]
• Dobrica Pavlinušić's random unstructured stuff (serial) 
• Dobrica Pavlinušić's random unstructured stuff (kernel) 
• Dobrica Pavlinušić's random unstructured stuff (video output) 
• Dobrica Pavlinušić's random unstructured stuff (u‑boot enviroment) 
• Dobrica Pavlinušić's random unstructured stuff (fw_printenv) 
• Dobrica Pavlinušić's random unstructured stuff (setup boot from usb) 
• Dobrica Pavlinušić's random unstructured stuff (power button) 

dove‑bootlog.txt 

Xtreme PC LXD8541
Chip PC Linux‑based Thinx OS
Product Specifications Xtreme PC LXD8541
Processor • Marvell Dove, Armada 510 800MHZ https://www.kernel.org/doc/html/v5.14/arm/marvell.html#dove‑family‑application‑processor 
Memory • 1GB, DDR3 @ 800MHz
Mass Storage • 2GB, High reliability eMMC NAND flash • Optional externally accessed MicroSD slot
Display Support • One DVI‑I port
 • Display Data Control (DDC) for automatic setting of resolution and refresh rate
Resolutions • Single: Up to 1920x1200 Pixels @ true color (32 bit)
 • Dual: Up to 1920x1080 Pixels @ true color (24 bit)
Video Player • Various video codecs, including: DivX HD, H.264 (MPEG4), WMV9/VC1
 • Up to 1080p local browser Flash support
Audio Support • High Definition Audio Codec
 • Stereo Audio Output ‑ 3 mm (1/8 inch) Audio‑Out Jack; 16‑bit Stereo, 96KHz
sample rate
 • Microphone Input ‑ 3 mm (1/8 inch), 8 bit
 • Software volume / mute control
Input / Output ports • 6 x USB 2.0 ports (2 front, 4 back)
serial
https://forum.doozan.com/read.php?2,67954,76099#msg‑76099 
Koen Re: Debian on Chip PC LXD8941 January 04, 2019 02:33PM
Inside there is both a 4 pin and a 6 pin header. The 4 pin is the UART connection. With the power button towards you and the DVI connection away from you the connections are as follows: GND, TX, RX, VCC (from left to right).
kernel
Linux Kernel 6.6.2 MVEBU package and Debian armhf rootfs
https://forum.doozan.com/read.php?2,32146 
mkfs.ext3 -L rootfs /dev/sda1
mount /dev/sda1 /mnt/sda1/
cd /mnt/sda1/
tar xvf /nuc/armada/Debian-6.6.2-mvebu-tld-1-rootfs-bodhi.tar.bz2

3. Create uImage with DTB appended.
root@nuc:/mnt/sda1# cd boot/
root@nuc:/mnt/sda1/boot# cp -a uImage uImage.orig
root@nuc:/mnt/sda1/boot# cp -a zImage-6.6.2-mvebu-tld-1 zImage.fdt
root@nuc:/mnt/sda1/boot# cat dts/dove-chip-lxd8941.dtb >> zImage.fdt
root@nuc:/mnt/sda1/boot# mkimage -A arm -O linux -T kernel -C none -a 0x00008000 -e 0x00008000 -n Linux-6.6.2-mvebu-tld-1 -d zImage.fdt uImage
Image Name:   Linux-6.6.2-mvebu-tld-1
Created:      Tue Dec 19 18:00:34 2023
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    5193798 Bytes = 5072.07 KiB = 4.95 MiB
Load Address: 00008000
Entry Point:  00008000

insert usb stick into back 4 usb ports, front 2 won't find storage device on usb
abort u‑boot over serial and issue boot from usb:
setenv bootargs console=ttyS0,115200 root=LABEL=rootfs rootdelay=10 ${mtdparts} earlyprintk=serial
usb start; ext2load usb 0:1 0x3000000 /boot/uImage; ext2load usb 0:1 0x4000000 /boot/uInitrd
bootm 0x3000000 0x4000000

video output
DRM and framebuffer are not currently (as of 6.6) supported in upstream kernel according to messages at
 forum, but dove‑chip‑lxd8941.dts doesn't include lcd power and dove‑hp‑t5335z.dts does.
Let's try to boot with this dts but this does not work.
u‑boot enviroment
fw_printenv
root@dove:~# cat /etc/fw_env.config
# MTD device name       Device offset   Env. size       Flash sector size       Number of sectors
/dev/mtd1 0x000000 0x010000

setup boot from usb
root@dove:~# fw_setenv bootusb 'setenv bootargs console=ttyS0,115200 root=LABEL=rootfs rootdelay=10 ${mtdparts} earlyprintk=serial ; usb start; ext2load usb 0:1 0x3000000 /boot/uImage; ext2load usb 0:1 0x4000000 /boot/uInitrd ; bootm 0x3000000 0x4000000'

root@dove:~# fw_printenv bootcmd
bootcmd=run bootmmc
root@dove:~# fw_setenv bootcmd bootusb

fw_setenv this doesn't work from booted debian system, re‑try over serial on u‑boot prompt:
MIC>> printenv usbboot
usbboot=usb start; sleep 3; ext2load usb 0:1 0x2000000 /boot/uImage; run usbargs;bootm 0x2000000
MIC>> setenv usbboot 'setenv bootargs console=ttyS0,115200 root=LABEL=rootfs rootdelay=10 ${mtdparts} earlyprintk=serial ; usb start; ext2load usb 0:1 0x3000000 /boot/uImage; ext2load usb 0:1 0x4000000 /boot/uInitrd ; bootm 0x3000000 0x4000000'
MIC>> printenv usbboot
usbboot=setenv bootargs console=ttyS0,115200 root=LABEL=rootfs rootdelay=10 ${mtdparts} earlyprintk=serial ; usb start; ext2load usb 0:1 0x3000000 /boot/uImage; ext2load usb 0:1 0x4000000 /boot/uInitrd ; bootm 0x3000000 0x4000000
MIC>> saveenv
Saving Environment to SPI Flash...
Erasing 0xc0000 - 0xd0000:      [Done]
Writing to SPI flash:           [Done]

MIC>> setenv bootcmd run usbboot
MIC>> saveenv
Saving Environment to SPI Flash...
Erasing 0xc0000 - 0xd0000:      [Done]
Writing to SPI flash:           [Done]

power button
seemes like it's on gpio 25
apt install gpiod

root@dove:/home/dpavlin# gpioget 0 0 1 2 3 4 5 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1 0 1 1 0 0 0 0 1 1 1 0 1 0 0 0 0 1 0 1 0 0 0 0 0 0
root@dove:/home/dpavlin# gpioget 0 0 1 2 3 4 5 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1 0 1 1 0 0 0 0 1 1 1 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0

root@dove:/home/dpavlin# gpiomon 0 25
event: FALLING EDGE offset: 25 timestamp: [    1466.369262333]
event: FALLING EDGE offset: 25 timestamp: [    1466.632278096]
event:  RISING EDGE offset: 25 timestamp: [    1467.188375662]
event:  RISING EDGE offset: 25 timestamp: [    1468.390585489]
event: FALLING EDGE offset: 25 timestamp: [    1470.143645190]
event:  RISING EDGE offset: 25 timestamp: [    1471.752436499]
event: FALLING EDGE offset: 25 timestamp: [    1473.233499601]
event:  RISING EDGE offset: 25 timestamp: [    1474.560678725]