The ayufan builds are released quite frequently.
Upgrading to a newer kernel (ex: kernel 4.15) is quite simple:
-
Uncomment pre-releases from
/etc/apt/sources.list.d/ayufan-rock64.list -
Search for available kernels:
apt-cache search linux-image -
Manually install the
<kernel>, ex:linux-image-4.15.0-rockchip-ayufan-177-g59389fa34apt-get update apt-get install <kernel>
-
Reboot