Thanks for all replys. Now I see the three identical paths refers to three different links (different HT links) but they all have the same path (same PCI path), and because the Opteron chip has three HT links, MAX_LINK is defined to 3, is it?
I'm porting linuxbios to a new uni-processor Opteron board, on the board the Opteron chip links to three AMD8131 chips, each on one HT channel. We intend to configure the three NCHT channels all as PCI bus0, seems the design of identical paths just fits :)
Regards, Liu Tao