nvidia-340.46-jessie-trusty-3.16.6-tinycore is now available in the prebuilt repo. Import and load it and also graphics-3.16.6-tinycore and xorg-all, and then in console mode issue the below commands:
sudo modprobe drm
sudo modprobe nvidia
sudo nvidia-xconfig
The last command will create a file /etc/X11/xorg.conf, add it to your backup. Also, you may need to load the kernel modules drm and nvidia manually after each boot, I add the below commands to my /opt/bootsync.sh:
modprobe drm
modprobe nvidia
This package is tested and works on dCore-jessie and dCore-trusty.