another important point i may have missed is the drivers for 3d graphics on
these tablets are missing in replicant as they are non-free
what programs are you wanting to run on them?
the 2d graphics work fine though
also the 3d graphics driver being missing dose not mean you
cant display 3d graphics it just means it will be done by
the cpu and so its wont be as fast
make sure to read the full status of the device(Galaxy Tab 2 7.0 (P31xx))
here:
http://redmine.replicant.us/projects/replicant/wiki/ReplicantStatus#Replicant-42