The 64bit version of FreeRadius 2.0.1+ works with UP.
This can be downloaded from SUSE and works. 2.0.x is expected to be in SLES10 SP3
The latest version I can see is 2.0.5 and coan be found (in architecture subdirectories) at:
Index of /repositories/network:/aaa/SLE_10
Hope that helps
Tim