The framebuffer issue is an interesting one as it works without issue on CM13-based Android ROMs with the same kernel and defconfig. Possible toolchain issue or patch needed for GCC6.
Devices with a working framebuffer output modesetting information in <code>dmesg</code> after loading the tegradc driver, but the PMOS compiled kernel does not. Common fixes including setting values in <code>/sys</code> have no effect yet.
== Fastboot issue ==