Doesn't look like AMD is going to block the unlock of these chips.

Source

AMD has recently denied the rumor that AMD will lock down core by a microcode update.


According to AMD, they will be putting out a microcode update to correct a Cool’n'Quiet bug that has been reported on the Athlon II X2 model 250 processor. Athlon II X2 is a pure dual-core die, so there is no chance of “unlocking” hidden cores as there aren’t any hidden in there at all.

AMD considers the core unlocking is something that’s relatively benign and gives users a shot at adding a bit of performance. Anyone would be “lucky” if they managed to unlock the cores, said Antal Tungler, Technical PR Manager for AMD in Euroland.