I have received my SCISHION V88 Piano and I can confirm that it boots to a Ubuntu Mate desktop from a micro SD-card with the image in the first post of this topic.
Like rob0809 I did nothing except insert the micro SD-card and power on
Unfortunately after running for a few minutes there were some I/O errors which I must investigate but this is perhaps due to my cheap (Ansonchina) SD-card.
I shall try other images and report back later.
I tried this image:
and it also booted directly but still with I/O errors.
I replaced the Ansonchina 8GB SD-card with a Kingston 8GB one and there were no more I/O errors
I tried the following images which also booted directly from the Kingston SD-card with no intervention: http://dietpi.com/downloads/images/DietPi_Rock64-ARMv8-Stretch.7z
Most of these images require an external USB Ethernet adapter (internal Ethernet and WiFi don't seem to be supported).
They also run much more slowly than I had expected. Unfortunately I don't think that this is just due to a lack of hardware graphics acceleration
But this is just a start and at least they do run
I found an easy hack to greatly speed up simple operations not involving heavy video or graphics.
(Due to the lack of hardware acceleration, YouTube videos, for example, still play frame by frame.)
I copied exactly the same disk image to both a micro SD-card and to a USB 3.0 storage device.
I modified the label on the root partition of the SD-card so that it would use the USB disk as the rootfs instead.
On most of these images the rootfs is labelled linux-root on partition 7.
I used gparted to change the SD-card's partition 7 label to linux-rootX so that it would pick up the partition on the USB drive instead.
I also used parted to correct for the size of both the devices and to increase the size of the root partition on the USB drive. However this is not strictly necessary.
As a stability test and a realistic benchmark, I compiled natively the recent mainline v4.15 Linux kernel: "make defconfig && make -j 4 Image" finished successfully in slightly under 100 minutes.
This is not too bad for a box costing about $40.
Even later update:
The best Ubuntu image that I have found is this one:
This currently redirects to:
There is only one single partition so I had to:
'- copy the image to a USB storage device
- resize the partition
- add the label linux-root
- copy the appropriate files from the boot directory of this partition to replace the dtb, Image and initrd.img files on the boot partition of the SD-card I used previously
- ensure that there is no partition labeled linux-root on the SD-card
- after booting I installed ubuntu-mate-desktop but this is obviously not mandatory
The advantages of this image are:
- it will find the linux-root partition even if the USB storage device is on a hub (otherwise the USB drive monopolizes the USB 3.0 port)
- YouTube video (nearly) works so there must be some hardware acceleration
Unfortunately the video freezes from time to time. This doesn't seem to be due to a slow Internet connection.
With this image the compilation time for the same kernel dropped to 72 minutes.
I also tried this image but it did not seem to boot (at least there was only a blank screen on HDMI).
Maybe it is headless so I shall try again to ssh into it.
(Or to login via a serial console but I have not yet needed to open the case.)