I'm trying to build a bootloader for DS918+. This synology version is based on Linux 4.4 and use ApolloLake CPU. The interesting thing is that since it is based on Linux 4.4, it contains newer GPU driver which supports up to KabyLake processor. The only CPU it won't support is CoffeLake which just came out. Anyway, this should enabled Hardware Transcoding for these newer processor.   Here's the progress so far. Original bootloader is from DS916+.   zImage - Using the default