I recently had ASRock N3150B-ITX motherboard that has this SoC.
With FreeBSD 12-CURRENT from 2017/10 (two months ago) and DRM-NEXT the x11/xorg starts in accelerated mode. In other words, GPU is supported and works well.
The problem is that the HDMI output does not work, only VGA.
The 4-core CPU works well, I had no timing issues, I used ntpd, dunno if that solves the 'timing issues', for the record, I have had enabled HPET in BIOS.
The integreted NIC - Realtek (re0) works good.
Two SATA ports work.
USB 2.0 and 3.0 worked well.
Another thing that did not worked (besides no HDMI output) was 'deaf' Mini Jack (sound output), maybe it will be 'fixable' by /boot/device.hints, havent tried, as no HDMI is enought for me to mark this board as 'no go'.
Here is the (only) config for x11/xorg:
% cat /usr/local/etc/X11/xorg.conf.d/card0.conf
Section "Device"
Identifier "Card0"
Driver "modesetting"
Option "AccelMethod" "glamor"
Option "DRI" "3"
EndSection
It has been suggested that I should also install libva-intel-driver and libva-utils for smooth movies/videos playback.
Run 'vainfo' to see what video acceleration your chip supports.
BUGs/SOURCEs:
https://github.com/FreeBSDDesktop/kms-drm/issues/17
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224257