FBSD 6.2-PRE/AMD64: two times SMBUS on ASUS A8N32-SLI?

[O. Hartmann]

Running FreeBSD 6.2-PRE/AMD64 on an ASUS A8N32-SLI shows up two smbus- 
interfaces as you can see in the short dmesg-excerpt. In kernel config 
there is only nfsmb mentioned, so I do not expect more than one smb-bus 
on that kind of motherboard.
Can anyone explain this odd behaviour?

Temperature- and fanspeed monitoring is still not possible, neither 
through ACPI, nor mbmon utility found in ports.

Regards,
Oliver

--

nfsmb0: <nForce2/3/4 MCP SMBus Controller> port 
0xcc00-0xcc1f,0x600-0x63f,0x700-0x73f irq 20 at device 10.1 on pci
0
smbus0: <System Management Bus> on nfsmb0
smb0: <SMBus generic I/O> on smbus0
nfsmb1: <nForce2/3/4 MCP SMBus Controller> on nfsmb0
smbus1: <System Management Bus> on nfsmb1
smb1: <SMBus generic I/O> on smbus1