Here's a test image with a tiler enabled 4.8.1 kernel, and an u-boot that show the extlinux menu( on the serial output) . The default kernel will load after a 3 second timeout
http://packages.pyra-handheld.com/images/extra/tiler/pyra-debian-jessie-mate...
either extract the .img, and dd to an sd card , or use a disk image writer (i use gnome-disks, which can handle .img.xz directly)
At least an 8GB card is needed. The image contents are a lot less, but it's nice to have a bit of extra space without having to resize the partition.
The tiler hack is started automatically by systemd through tiler.service, and just runs the script located at /usr/share/pyra/scripts/tiler.sh
This also helps fix the problem I kept having where fbset reports a 1024x768 framebuffer, and nothing gets output on the lcd (probably because it sometimes seems to thinks nothing is connected to the lcd output during boot.)