
The tables they supply on their site indicate whether or not the motherboards can turn off the TLB erratum in the BIOS, and more importantly if the boards have Phenom compatibility or not.
Apparently some makers are confident that their boards have the capability, but only a few have been tested by AMD directly. These differences are also listed on the tables which can be found here.
The table itself is an invaluable tool for any prospective Phenom purchasers and should influence many decisions as to which motherboard to get to go with the super cheap AMD Phenom quad-core processor.