1. LAKKA dm-mod.ko 
   LaKKa config 
   https://github.com/libretro/Lakka-LibreELEC/releases download source code
   \projects\Generic\linux\linux.x86_64.conf
   
   Linux Kernel
   linux-4.11.12.tar.xz & patch-4.11.12-rt14.patch.xz
   patch -p1 < ../patch-4.11.12-rt14
   
   make menuconfig
   select device mapper as module
   make -j 16
   get drivers\md\dm-mod.ko

2. LibreELEC dm-mod.ko
   LibreELEC config 
   https://github.com/LibreELEC/LibreELEC.tv/releases download source code
   \projects\Generic\linux\linux.x86_64.conf
   
   Linux Kernel
   linux-5.1.6.tar.xz
   make menuconfig
   select device mapper as module
   make -j 16
   get drivers\md\dm-mod.ko