Dobrica Pavlinušić's random unstructured stuff
Tegra: Revision 7
Tegra2_TRM_DP04508001v01p.pdf

I will try to collect useful stuff about Tegra latest upstream source on this page.

Nvidia Tegra 2/3 APX/nv3p protocol implementation

qemu

https://github.com/digetx/tegra2_qemu

VDPAU

https://github.com/grate-driver/libvdpau-tegra

tegra2 support for mainline

https://github.com/grate-driver

https://github.com/grate-driver/grate/wiki/Grate-driver