Besides boot size as one kerning qualifier, this sample is in the shadows of current thin-client competition. Mainly, I removed config selections that had put the APU in the mainframe context while I kept the MicroATX form factor enabled.
https://d9722f62325d2bd1384e020adbf9a24f8cb61da9.googledrive.com/host/0BwbGmBMsoIsUZzlkaWNaSDhfa2c/MicroATX_APU-DRM-sample.configFrom 3.16.7-ckt11, there are still some CONFIG_X86 dependencies stuck enabled that are only sensible with generic (wired or wireless), mainframe, or standard ATX form factors.
Here is 'ls -l' for 3.16.7-ckt11 rebuilt with sample config with DRM=y.
-rw-r--r-- 1 root root 157726 May 25 21:05 config-3.16.0-4-amd64
-rw-r--r-- 1 root root 78668 Aug 29 14:07 config-3.16.7-ckt11
-rw-r--r-- 1 root root 15685504 Jun 8 11:40 initrd.img-3.16.0-4-amd64
-rw-r--r-- 1 root root 4012403 Aug 29 14:24 initrd.img-3.16.7-ckt11
-rw-r--r-- 1 root root 2672158 May 25 21:05 System.map-3.16.0-4-amd64
-rw------- 1 root root 2283447 Aug 29 14:14 System.map-3.16.7-ckt11
-rw-r--r-- 1 root root 3112752 May 25 21:05 vmlinuz-3.16.0-4-amd64
-rw------- 1 root root 3100688 Aug 29 14:14 vmlinuz-3.16.7-ckt11