TCPA has nothing to do with Palladium.
http://www.research.ibm.com/gsal/tcpa/
And Linux will run on a TCPA machine.
The problem is some software and other media will not run without TCPA or Palladium being enabled, not the other way around (hardware won't run signed software). Since open source software isn't made this way, who cares? I can easily live without MS software and stuff from the Ass.[es] of America. The TCPA chips is not made to be physically tamperproof anyhow, so mod chip type stuff could be possible
TCPA is just for encryption and storing keys in hardware. Basically a builtin smartcard. Your information is encrypted, with the keys stored in the chip, inaccessible to viruses.
Palladium is the greator threat, though it's windows only. You might not be able to play music or whatever under Linux. I don't care about that though. Besides, if you really wanted to, you could just connect the analog out of a CD player into the input of the sound card, and play(or copy) music that way.
Palladium is what needs to be killed.