Interesting Repo's

GitHub - OE4T/u-boot-tegra: U-Boot for NVIDIA TegraGitHub

Good for reference DTB's etc

GitHub - imbushuo/boot-shim-tegra-3: Boot Shim with a Tegra 3 (Surface RT) specific patchGitHub

Good for patch for SurfaceRT grub to have display. Also setup for VisualC

GitHub - tofurky/tegra30_debrick: fusee-gelee payload, supporting files, and guide for debricking Tegra 3 devices (2012 Nexus 7 and Ouya)GitHub

Fusee Gelee for T30 (SurfaceRT)

GitHub - coherixmatts/grub-2.04: Latest version of Grub - this will allow booting linux efistub kernels on the Surface RT and Surface 2 (i.e. ARMv7 or ARM32) once a full unlock is releasedGitHub

Grub for SurfaceRT and RT2 pre-patched for display output.

GitHub - rhboot/shim: UEFI shim loaderGitHub