I’m trying to build a system that supports SGX + EGLFS on a 4DCAPE-70T.

The directions at http://vanguardiasur.com.ar/opengl-es-on-beaglebone-black/ get me SGX + EGLFS with a TI v4.1.6 kernel, but without support for the 4DCAPE-70T.

The directions at https://groups.google.com/d/msg/beagleboard/hG1JiS40o6U/a-f3M62HGLwJ looks like they’ll get me very close to what I want with a TI 3.14 kernel, and I can see that RobertCNelson has a bunch of handy device tree files supporting the 4DCAPE-70T.

However, I’m not sure how to apply the am335x-boneblack-4dcape-70t.dts to my build. Hopefully that’s a simple task?

We use U-Boot Overlays now..

That guide uses Buildroot, so you'll need to do some work: