I would like to add my two cents. I have read this thread after installing Armbian 21.02.3 Focal with Linux 5.10.21-meson and running into some USB related issues - USB hard drive was not detected.
But contrary to what image description states - eMMC works. My odroid-c1 device contains root filesystem on eMMC. I have not noticed any issues related to eMMC support.
About USB issue - it turns out there is a workaround I found it on some kernel dev mailing linst - adding
usbcore.autosuspend=-1
to kernel boot arguments makes USB fully functional. At least I have not yet run into any issues.
