Quoting HonzaHavlicek:

• The nv_demos are small programs used for RE of nvidia commands and registers. They are not drivers and they do not use DRI/Gallium3D. They manually set up objects and write some commands to FIFO. The developer write some code to nv_demo and hopes to achieve some result (triangle, repated texture, scissors..). She will achieve the expected result (mostly) after a few (painfull) hours (days). General principle is to look at the MMIO and renouveau dumps and try to repeat what nvidia blob did. Sometimes it is a single bit, sometimes the whole infrastructure.

  * nv04_demo <a href="http://nouveau.cvs.sourceforge.net/nouveau/nv04_demo/">http://nouveau.cvs.sourceforge.net/nouveau/nv04_demo/</a> 
  * nv10_demo <a href="http://nouveau.cvs.sourceforge.net/nouveau/nv10_demo/">http://nouveau.cvs.sourceforge.net/nouveau/nv10_demo/</a> 
  * nv20_demo <a href="http://cgit.freedesktop.org/~pq/nv20_demo/">http://cgit.freedesktop.org/~pq/nv20_demo/</a> 
  * nv30_demo <a href="http://cgit.freedesktop.org/~jkolb/nv30_demo/">http://cgit.freedesktop.org/~jkolb/nv30_demo/</a> 
  * another nv30_demo <a href="http://cgit.freedesktop.org/~pmandin/nv30_demo/">http://cgit.freedesktop.org/~pmandin/nv30_demo/</a> 
  * nv40_demo <a href="http://nouveau.cvs.sourceforge.net/nouveau/nv40_demo/">http://nouveau.cvs.sourceforge.net/nouveau/nv40_demo/</a> 
  

Instructions (nv10_demo in this example)

• [[!format txt """ cvs -d:pserver:anonymous@nouveau.cvs.sourceforge.net:/cvsroot/nouveau login cvs -z3 -d:pserver:anonymous@nouveau.cvs.sourceforge.net:/cvsroot/nouveau co -P nv10_demo """]] Then enter nv10_demo and just run make.

The binary requires access to the drm module, run it using root: sudo ./nouveau_demo.