Kernel Sources for NanoPC-T1

Hi,

have the Ubuntu 8GB Image (from 15.4.) running on T1.
System runs fine from SD and MMC, kernel 3.18.16.

Have a boot-SD that connects via USB to Linux MiniTools.

Now need several kernel modules (one wire, sensors).

1. Where can I get the kernel sources to config and compile on T1? (prefer
git)
2. How to install zImage and ramdisk from /usr/src/linux to the boot
location.
3. Where can I see the boot location?

Looks quite complicated and not so well documented compared to my U3.
But lot more I/O, appreciate this.

Thanks.